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Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Author(s): 

Journal: 

Seed and Plant

Issue Info: 
  • Year: 

    2003
  • Volume: 

    19
  • Issue: 

    2
  • Pages: 

    15-15
Measures: 
  • Citations: 

    0
  • Views: 

    474
  • Downloads: 

    0
Abstract: 

A two - year Invetigation (1997-98) was conducted to determine the various losses of potato tubers after harvesting and during the storage periods. The results revealed that 23.02 percent of the harvested tuber go on waste due to various causing effects including diseases and / or evironment. The components of these losses individually were of soft rot 3.43%, Fusarium dry rot 4.89%, Brown rot 2.30%, tuber greening 2.44% internal bruising 1.27%, physiological disorders 4.38% (includings cracking, unsuitable harvesting, secondry growth, under sized of tubers, etc.) deep injuries due to unsuitable harvesting, 1.72% and pests including Gryllotapa gryllotapa, Agrotis lineatus and phethrimea aperculella totally 1.65%. Statistical analysis showed no any significant effects in years but there was of a high correlation coefficient. The potato cultivars were cosima, marfona,Morren, Agria, Pikaso, Deraga and Arrian. The loss of potato tubers in these cultivars were 25.66, 24.76, 23.34, 21.24, 20.50, 18.56 and 17.20 percent, respectively. Potato cultivars differed in their degree of losses to various causing agents and/or effects in totality in which there were of a significant effects between the cultivars as far as the individual causing effects are concerned. Diseases such as black scurf (Rhizoctonia solani) and scab (Streptomyces scabis) were not enocunted, because of no any potato losses but there are losses in marketing. The other very minor diseases and environment effects were not included too.

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Journal: 

Seed and Plant

Issue Info: 
  • Year: 

    2003
  • Volume: 

    19
  • Issue: 

    2
  • Pages: 

    3-6
Measures: 
  • Citations: 

    0
  • Views: 

    570
  • Downloads: 

    0
Abstract: 

To study the reaction of two rowed barley landraces from west of Iran, 278 accessions from eight provinces were planted in Karaj and Gorgan Station, in an observation trial without replication. Infection rate was measured using the method of Saari and Prescott. Some agro morphological characters such as grain yield, flowering date, plant height were also measured. Results showed that the accessions had different reactions to powdery mildew. The range of infection varied from O (immune) to 8 (susceptible) in Karaj, and from 2 (resistant) to 9 (very susceptible) in Gorgan. The frequencies of infection rates of 6 and 7 (moderately susceptible) were 38.4% and 39.2% in Karaj and Gorgan, respectively. Difference of means at two stations was significant (t = 2/04). The frequencies of resistance and moderately resistance reactions were 4.4% and 1.1 % in Karaj and Gorgan, respectively. Reaction to powdery mildew with other agronomic characters such as flowering date showed a negative and significant correlation.

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Author(s): 

MOGHADDAM A.

Journal: 

Seed and Plant

Issue Info: 
  • Year: 

    2003
  • Volume: 

    19
  • Issue: 

    2
  • Pages: 

    1-3
Measures: 
  • Citations: 

    0
  • Views: 

    431
  • Downloads: 

    0
Abstract: 

Both yield and stability of yield should be considered simultaneously in order to reduce effect of genotype × environment interaction and to make selection of genotypes more precise and effective. One applied method is simultaneous selection for yield and stability (YS__i). The objective of this study was to utilize YS__i statistic in cultivar selection and compare the results with other statistics such as S2__i, CV__i, S2__di and R2__i, Twelve foreign corn hybrids with two Iranian check hybrids, SC 704 and SC 604, were evaluated in a randomized complete-block design with four replications at five locations in 1996 cropping season. Six hybrids with overall mean grain yield of 11.31 tha^-1 were selected by Kang"s method. Overall mean yield of selected hybrids by only yield (regardless of hybrid stability), yield plus environmental variance (or environmental coefficient of variation) and yield plus coefficient of regression and deviations from regression mean squares were 11.30, 11.16 and 11.31 tha^-1, respectively. Regard to the LSD%5 (=0.827), differences among overall mean yields or different selection creteria (different stability statistics) were not significant. It is concluded that when we use YS^I statistic, we can insure precise selection of the clutivar.

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Author(s): 

مقدم علی

Journal: 

نهال و بذر

Issue Info: 
  • Year: 

    1382
  • Volume: 

    19
  • Issue: 

    1
  • Pages: 

    1-13
Measures: 
  • Citations: 

    3
  • Views: 

    817
  • Downloads: 

    0
Abstract: 

جهت کاهش اثر متقابل ژنوتیپ × محیط (GE) و انجام گزینش دقیق تر، عملکرد و پایداری هیبریدها باید به طور همزمان مدنظر قرار گیرند. یکی از روش های کاربردی گزینش همزمان برای عملکرد و پایداری آماره YS__i است. هدف از این مقاله استفاده از روش فوق و مقایسه آن با نتایج حاصل از گزینش ارقام بر اساس عملکرد تنها، عملکرد بعلاوه آماره های واریانس محیطی (S^2__i)، ضریب تغییرات محیطی (CV__i)، ضریب رگرسیون (b__i)، انحراف از خط رگرسیون (S^2__di) وضریب تبیین (R^2__i) میباشد. دوازده هیبرید خارجی با دو هیبرید شاهد ایرانی ذرت SC704 و SC604 در قالب طرح بلوک کامل تصادفی در 4 تکرار و 5 منطقه در سال 1375 مورد ارزیابی قرار گرفتند. با استفاده از آماره YS__i، شش هیبرید با متوسط کل 31/11 تن در هکتار عملکرد دانه انتخاب شدند. میانگین عملکرد دانه هیبریدهای انتخابی با معیار عملکرد (بدون در نظر گرفتن پایداری هیبریدها) 30/11 تن در هکتار، با معیار عملکرد بعلاوه ضریب تغییرات محیطی یا واریانس محیطی 16/11 تن در هکتار و با معیار عملکرد بعلاوه ضریب رگرسیون و میانگین مربعات انحراف از خط رگرسیون 31/11 تن در هکتار بود. با توجه به LSD محاسبه شده(LSD %5=0.827) تفاوت معنی داری بین روش های مختلف گزینش مشاهده نگردید. بنابراین چنین می توان نتیجه گرفت که با استفاده از روش گزینش همزمان برای عملکرد و پایداری (به واسطه تأکید بیشتر بر جزء پایداری) می توان با اطمینان بیشتری فرآیند گزینش را انجام داد.

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Journal: 

Seed and Plant

Issue Info: 
  • Year: 

    2003
  • Volume: 

    19
  • Issue: 

    2
  • Pages: 

    2-2
Measures: 
  • Citations: 

    2
  • Views: 

    1099
  • Downloads: 

    0
Abstract: 

During 1997 to 1999, five races of T. laevis were reported from different parts of Iran. In the present investigation some new pathotypes of the pathogen which are new for Iran or for the world are reporting. Wheat spikes infected with T. laevis were collected from different areas. Teliospores obtained from a single spike were considered as an isolate. Teliospores of each isolate were used to inoculate seeds of differential cultivars. Infected seeds were grown in a bunt infection free field in Karaj, and at the harvesting time, percentage of infected spikes for each cultivar and isolate were assessed. The virulence factors in each isolate and the related races were determined. Ten isolates from Khosroshahr, Shirvan, Maragheh, Ardabil and Uromieh had nine new combinations of virulence factors, which had not been included in the previously published race determination tables, therefore these combinations are described as L-20 - L-28 pathotypes as follows: L-21, isolate No. 1 from Khosroshahr, virulent on genes Bt2, 3, 7, 8, 9; L-22, isolate No. 2 from Khosroshahr, virulent on genes Bt7, 8, 13; L-23, isolate No. 1 from Shirvan, virulent on genes Bt3, 4, 7; L-24, isolate No. 2 from Shirvan, virulent on genes Bt2, 3, 7, 8, 13; L-25, isolate No. 1 from Maragheh, virulent on genes Bt7, 9; L-20, isolate No. 2 from Maragheh, virulent on genes Bt7_ 8; L-26, isolate No. 1 from Ardabil, virulent on genes Bt2, 7, 9, 15; L-27, isolate No. 2 from Ardabil, virulent on genes Bt2, 3, 7, 8; L-28, isolates No. 1 and 2 from Uromieh, virulent on genes Bt3, 7, 8. Virulence frequencies of these new pathotypes for resistance genes Bt2, Bt3, Bt4, Bt7, Bt8, Bt9, Bt13 and Btl5 were 40%, 60%, 10%, 100%, 70%, 30%, 20% and 10%, respectively. As genes Btl and Bt6 are susceptible to races L-4 and L-17, previously reported in Iran, therefore genes Bt5, Bt10, Bt11, Bt12, Bt14 and Bt p are still resistant to the new pathotypes and races present in Iran.

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Journal: 

نهال و بذر

Issue Info: 
  • Year: 

    1382
  • Volume: 

    19
  • Issue: 

    1
  • Pages: 

    25-36
Measures: 
  • Citations: 

    0
  • Views: 

    649
  • Downloads: 

    0
Abstract: 

به منظور بررسی واکنش جوهای بومی دو ردیفه مناطق غرب کشور به بیماری سفیدک پودری (Erysiphe graminis f. sp. Hordei)، تعداد 278 نمونه از هشت استان مختلف در دو منطقه کرج و گرگان در یک آزمایش ساده مشاهده ای بدون تکرار کاشته شدند. واکنش به سفیدک پودری و بعضی از صفات زراعی مانند عملکرد دانه، زمان گلدهی و طول بوته در هر دو منطقه یادداشت برداری گردید. نتایج نشان داد که نمونه های مزبور از نظر واکنش به سفیدک پودری بسیار متنوع بوده و دامنه تغییرات این صفت در کرج از مصون تا بسیار حساس (صفر الی 9) و در گرگان از مقاوم تا بسیار حساس (2 الی 9) می باشد. بیشترین فراوانی به ترتیب به کرج و گرگان مربوط به نمونه های نیمه حساس با فراوانی نسبی 38.4 و 39.2 درصد بود. میانگین صفت به ترتیب 7.25 و 7.47 و تفاوت اختلاف میانگین در دو منطقه معنی دار بود. تعداد معدودی نمونه در دو منطقه به بیماری مقاومت نشان دادند که برای کرج و گرگان فراوانی نمونه های مقاوم و نیمه مقاوم به ترتیب 4.4 و 1.1 درصد بود. واکنش به سفیدک پودری در هر دو منطقه با زمان گلدهی همبستگی منفی و معنی دار نشان داد و ضرایب همبستگی برای گرگان و کرج به ترتیب r=-0.37*** و r=-0.21*** بود.

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Author(s): 

ETEBARIAN H.R.

Journal: 

Seed and Plant

Issue Info: 
  • Year: 

    2003
  • Volume: 

    19
  • Issue: 

    2
  • Pages: 

    5-5
Measures: 
  • Citations: 

    1
  • Views: 

    1317
  • Downloads: 

    0
Abstract: 

Barley stripe is a common disease of barley where the crop is grown. The mean percentage of infected barley fields during 2000 and 2001 was estimated 5.17 ± 2.5 and 3.67+/- 2.38, respectively in Varamin area. In order to find the sources of resistance among barley cultivars, 9 cultivars: Reyhan, Valfajr, Karoon, Aras, Jonob, Gorgan, Morex, Chevron and Roboust were tested in glasshouse. Inoculation was carried out by placing 40 barley seeds between two mycelium-covered plates. For evaluation of resistance and susceptibility of barley cultivars in field, two experiments were carried out. In the first experiment 13 barley cultivars Zarjo, Valfajr, Roboust, Reyhan, Kavir, Karoon, Chevron, Excell, Gorgan, Aras, Dasht, Jonob and CI 9539 were used. The isolate No. 19 of Pyrenophora graminea was grown on potato dextrose agar plates (90 mm) until the plates were covered with mycelia. The seeds to be infected were then placed on the plates and allowed to germinate at 4-5°C for 10 days. In the second experiment 18 barley cultivars: Gorgan, Karoon × Kavir, Goharjo, Aras, Eram, Makooye, C__2, Reyhan, Jonob, Kavir, Dasht, Valfajr, Chevron, Excell, Roboust, CI9539, Morex and Karoon were used. The method of seed inoculation was similar to the first experiment. The germinated infected seeds were grown in field conditions. Evaluation of disease symptoms was performed at different times after planting. Percentage of infected leaves and infected stems were determined. Results indicated that cultivars Jonob, Eram, Makooye and C__2 had the least infection and were the most resistant cultivars. Cultivars Karoon, Zarjo, Valfajr, Reyhan, Kavir and Karoon × Kavir were susceptible. Cultivars Morex, Chevron, CI9539, Roboust, Excell and Goharjo had the intermediate reactions.

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Journal: 

نهال و بذر

Issue Info: 
  • Year: 

    1382
  • Volume: 

    19
  • Issue: 

    1
  • Pages: 

    101-116
Measures: 
  • Citations: 

    0
  • Views: 

    572
  • Downloads: 

    0
Abstract: 

سپتوریوز برگی یکی از مهم ترین بیماری های گندم در جهان می باشد. این بیماری در سال 1375 در خوزستان و اغلب نقاط کشور به صورت همه گیر ظاهر شد. به منظور تعیین میزان خسارت ناشی از آلودگی های این بیماری در مراحل مختلف رشد در سه رقم گندم در خوزستان، آزمایشی به صورت کرت های یک بار خرد شده در قالب طرح بلوک های کامل تصادفی به مدت دو سال در ایستگاه اهواز اجراء گردید. کرت اصلی شامل تیمارهای مایه زنی بیماری بود که به فواصل 18-14 روز در مراحل مختلف رشدی GS__12، GS__23، GS__31، GS__37، GS__47 و GS__58 با سوسپانسیون اسپور انجام و یک تیمار نیز بدون مایه زنی به عنوان شاهد در نظر گرفته شد. ارقام فلات، اترک و داراب 2 در کرت های فرعی گنجانده شدند. در این آزمایش عملکرد دانه و اجزاء آن در ساقه اصلی و پنجه ها، شامل تعداد سنبله در مترمربع، تعداد دانه در سنبله و وزن هزار دانه اندازه گیری شد. تجزیه آماری بر روی اطلاعات به دست آمده انجام شد و رگرسیون خطی بین درصد کاهش عملکرد محصول و تعداد روزهای آلودگی نیز برازش گردید. نتایج دو ساله نشان داد که این بیماری بسته به رقم، مرحله آلودگی و شدت آن، می تواند باعث کاهش 99/6 الی 20/38 درصد محصول شود. این بیماری باعث کاهش معنی دار تعداد دانه در سنبله در آلودگی مراحل اولیه رشد و وزن هزار دانه در آلودگی در کلیه مراحل رشد شد، اما روی تعداد سنبله در متر مربع اثر معنی داری نداشت. وجود سپتوریوز بعد از شروع آلودگی، در ارقام فلات، اترک و داراب 2 روزانه به ترتیب به میزان 28/0، 25/0 و 30/0 درصد باعث کاهش محصول شد.

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Journal: 

Seed and Plant

Issue Info: 
  • Year: 

    2003
  • Volume: 

    19
  • Issue: 

    2
  • Pages: 

    11-11
Measures: 
  • Citations: 

    1
  • Views: 

    1209
  • Downloads: 

    0
Abstract: 

Studying some important crop characteristics in a population and consideration of the limitations and possibilities, is a general way to determine the suitable genotypes. In this way, a part of population is used as a standard for evaluation of other parts and an optimal level is defined. In order to determine the optimal level in some crop characteristics and comparison of wheat suitability under dryland conditions, a broad information bank wasdeveloped and studied using results of 6 years cold-drylands yield trials. By using boundary lines, optimal level of crop characteristics including days to heading, days to physiological maturity, duration of grain filling, plant height and thousand kernel weight were determined, 221.2 days, 259.6 days, 33.8 days, 62.5 centimeter and 28.3 gram, respectively. These data were closely similar to the optimal levels obtained from averaging method. Results showed that recommended cultivars in each location had similar maximum crop properties balance index (CPBI). Related maximum CPBI in Maragheh, Sanandaj, Zanjan, Ardabil and Uromieh was about 155, 270, 150, 182 and 440, respectively. Comparing with the adaptability of some popular wheat cultivars showed that cv. Sardari is suitable for cold winter and cool spring with spring precipitation, Sabalan is suitable for cold winter and relatively temperate spring with abundant spring precipitation and Azar 2 is suitable for cold fall and mild spring with fall-spring precipitation and low winter precipitation.

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Journal: 

Seed and Plant

Issue Info: 
  • Year: 

    2003
  • Volume: 

    19
  • Issue: 

    2
  • Pages: 

    12-15
Measures: 
  • Citations: 

    1
  • Views: 

    1111
  • Downloads: 

    0
Abstract: 

Six male sterile with four male fertile sorghum, Sorghum bicolor(L.) Moench, lines were crossed in a factorial mating design in 1998. Twenty four F1 hybrids and ten parental lines were planted in a randomized complete block design in three replications, at Seed and Plant Improvement Institute, Karaj, Iran in 1999. Two cuttings forage were harvested from all genotypes (F12 and parents). Four traits including plant height, tiller no., green yield and dry matter were measured. There were significant differences among genotypes, cuttings and genotype X cutting interaction for all traits at 1% level of probability. Analysis of variance showed that, there are significant effects of genotypes, parent, parent vs. crosses (except for tiller no. at average of cuttings), lines (for plant height in 2nd cut and mean), testers and line tester interaction. There were differnces among lines and testers GCA which shows the importance of additive effects of genes for this traits, therefore, the selection methods can be used for breeding programmes. Heretiability of some traits were different in first, second and average of cuttings. Therefore, in each cutting, the heretiability should be considered in multi cutting sorghum lines. Significant differences were observed among SCA of some parents which shows the importance of dominance effects of genes for majority of traits in hybrids. Hence the hybridization method can be used for breeding programmes. The highest positive SVA was obtained for green fodder from crossing of A__ICS 84 × R__2 , A__ICS88005× R__1, A__ICS31×R__28 & A__1×R__112, and for dry matter from crossing of A__ICS88005×R__1, A__ICS__31×R__28, A__2×R__112, A__ISC84×R__112& A__ICS31× R__2 at average of two cutting. The highest yield of two cuttings was obtained for green fodder from crossing of A__ICS84×R__2 and for dry matter from crossing of A__ICS31×R__2 with 144.8 and 34.5 tha^-1 , respecticely.

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Author(s): 

NAJAFINEJAD H. | MADDAHIAN H.

Journal: 

Seed and Plant

Issue Info: 
  • Year: 

    2003
  • Volume: 

    19
  • Issue: 

    2
  • Pages: 

    13-16
Measures: 
  • Citations: 

    5
  • Views: 

    1085
  • Downloads: 

    0
Abstract: 

In order to study the effects of different irrigation regimes and planting density on yield and agronomic traits of corn, an experiment was carried out in Research Farm of Orzoiyeh in kerman Agicultural Research Center for two years (1998-99). A split-splite plot randomized complete block design with 18 treatments and four replications were used. The irrigation treatments were assigned to main plots(irrigation after 75 mm; irrigation after 100 mm; irrigation after 125 mm, from class A pan). Row spaces were assigned to sub plot(60 and 75 cm) and plant spaces to sub-sub plot (15, 20 and 25 cm). Results showed that the grain yield among irrigation regimes, row spacing and plant spacing were significantly different. Among irrigation regimes, treatment of irrigation after 75 mm had the highest and treatment of irrigation after 125 mm had the lowest grain yield. By increasing the planting density, kernel/ ear, ear length and kernel protein percent decreased, but grain yield increased. Highest grain yield obtained in 111100 and 88800 plant/ha, respectively. The effect of irrigation regimes and planting density (row space and plant space) on harvest index was not significant, and this index was about, 52%. In this study water use efficiency increased with increase in planting density and water stresses. Based on the results of this study, the second irrigation regime for period of the first three months and the third irragation regime for the last month of corn growth period and planting density of 88 and 111 thousand plants per hectare, (combinations of 75 × 15 and 60× 15 cm) could be recommended for Orzoiyeh region.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Journal: 

Seed and Plant

Issue Info: 
  • Year: 

    2003
  • Volume: 

    19
  • Issue: 

    2
  • Pages: 

    14-16
Measures: 
  • Citations: 

    1
  • Views: 

    1377
  • Downloads: 

    0
Abstract: 

In order to study the effects of four tillage systems on yield components of three soybean cultivars, an experiment was conducted in a field at Araghi -Mahalleh Research Station of Gorgan in summer of 1997, after wheat was harvested. The experiment was factorial based on a randomized complete block design with four replications and 12 treatments. Treatments ware the combinations of four tillage systems and soybean cultivars. The tillage systems were T__1) burning wheat straw; two perpendicular disks; irrigation; a shallow disk; planting, T__2) burning wheat straw; irrigation; direct drilling (no-tillage), T__3) two perpendicular disks on the field consisting of wheat straw; irrigation; planting and T__4) irrigation; direct drilling on the field having wheat straw (no-tillage). The three soybean cultivars used in the experiment were williams, Gorgan 3, and Sahar. Characteristics such as number of days from sowing to flowering and maturity, number of seeds per pod, number of pods plant, number of seeds per plant, 1000 seeds weight, and grain yield were measured. The results indicated that the T__3 and T__4 tillage systems increased number of days flowering and maturity, 1000 seeds weight, and grain yield, compared to the other systems. However, there was no significant difference among four systems in number of seeds per pod. The number of days from sowing to flowering and maturity and number of pods per plant in sahar cultivar were higher than those of the other two cultivars. The highest grain yield was obtained from sahar cultivar under T__4 tillage system. In this experiment, 1000 seed weight was the only component that showed significant positive correlation coefficient with the grain yield.

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Journal: 

Seed and Plant

Issue Info: 
  • Year: 

    2003
  • Volume: 

    19
  • Issue: 

    2
  • Pages: 

    16-18
Measures: 
  • Citations: 

    2
  • Views: 

    1555
  • Downloads: 

    0
Abstract: 

The present investigation was carried out in the Department of Horticulture, College of Agriculture, Tehran University in Karaj, to study the effects of Azolla in composting of tree bark, tea wastes and rice hull and to compare the physical and chemical properties of mixes and organic matters with media standards for use on the ornamental plants. At first, Azolla ferm were mixed with tree bark, Tea wastes and rice hull as volume ratios of 0%, 25%, 75% and 100%. The mixes were sampled, during composting in 45 and 90 days, for maturity determination. The experiment was designeed in Randomized Complete Blocks, with four replications. After five months, the mixes were sampled again, and compared with control mix consisted of 50% peat and 50% perlite. At this time all physical and chemical properties were measured. Results showed that Azolla alone, did not significantly affect rice hull in composting, but in 50% and 75% ratios significantly affected composting of tree bark and tea wastes. Azolla compost was rich in nutrient elements, and tree bark compost and its mixes with Azolla had the best properties for ornamental plants media.

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Author(s): 

DAMADZADEH M.

Journal: 

Seed and Plant

Issue Info: 
  • Year: 

    2003
  • Volume: 

    19
  • Issue: 

    2
  • Pages: 

    17-17
Measures: 
  • Citations: 

    0
  • Views: 

    1194
  • Downloads: 

    0
Abstract: 

In this study 58 isolates of Fusarium moniliforme which causes rice foot rot disease were collected from infected rice seeds. The morphological characteristics and pathogenicity of these isolates were determined in laboratory and greenhouse in the International Rice Research Institute (IRRI). Besides, by RAPD(Random Amplified Polymorphic DNA) technique using primer J-11 from operon kit by sequences of "5-ACTCCTGCGA-3" the randomized portion of the DNA of each isolate was amplified. Using cluster analysis at 25% similarities, the isolates were classified as follows: from point of the growth rate of fungi after 4 days in Petri dishes into 8 groups; from point of the number of days that fungi reached to the 90 mm diameter in one group; from point of the effect of isolates on the length of seedlings into 5 groups; from point of the genetical pattern into 13 groups. The characteristics measured in the laboratory or greehouse for each isolate did not significantly differ with the mean of each group using t-test analysis. Therefore, it could be concluded that molecular markers by RAPD technique can be used in differentiation of morpological and pathogenicity of Fusarium moniliforme isolates. The positive significant correlation coefficient (r=0.54) was observed between the growth rate of fungi in petri dishes and its effect on the length of seedling.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Journal: 

Seed and Plant

Issue Info: 
  • Year: 

    2003
  • Volume: 

    19
  • Issue: 

    2
  • Pages: 

    18-20
Measures: 
  • Citations: 

    0
  • Views: 

    1911
  • Downloads: 

    0
Abstract: 

The rate of sensitivity of nymphs and adults of Eurygaster integriceps put., fed on wheat cultivar falat, to fenitrothion insecticide was studied. The main objective of this study was to determine the possibility of integrating wheat cultivars with fenitrothion in an integrated sunn pest(E. integriceps) management programme. The experiments were conducted in laboratory and field in varamin during 1998-9 The sensitivity of 4th and 5th instar nymphs and new adults reared on falat to insecticide fenitrothion (a.i=50%) was enhanced, compared with those on sardari. LC50 of insecticide on all three life stages of insects fed on falat was less than sardari. The LC50 of insecticide on all three life stages of insects fed on falat was less than sardari. The LC50 of insecticide on sardari and falat for 4th instar nymphs was 42.16 and 33.48, for 5th instar nymphs was 147.03 and 114.01 and for new adults was 303.35 and 227.88 ppm, respectively. Therefore LC50 of insecticide for 4th and 5th nymphs and new adults fed on falat was reduced about 20,22 and 25 percent, respectively, compared with those on sardari. The results also showed that by increasing the life stages of insects reared on falat, the rate of sensitivity to insecticide was enhanced. The comparison of MRGR for 4th and 5th instars reared on falat and sardari with and without using sublethal doses of insecticide showed that there was synergism between falat and fenitrothion. sardari/falat ratio of MRGR with and without using insecticide for 4th nymphs was 1.53 and 1.23 and for 5th nymphs was 2.02 and 1.34, respectively.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Journal: 

Seed and Plant

Issue Info: 
  • Year: 

    2003
  • Volume: 

    19
  • Issue: 

    2
  • Pages: 

    19-21
Measures: 
  • Citations: 

    7
  • Views: 

    1089
  • Downloads: 

    0
Abstract: 

To study the stability and adaptability of grain yield of advanced bread wheat genotypes in cold and moderate-cold dryland areas, 16 adanced genotypes were evaluated in Maragheh, sararood, kordestan, Ilam, Zanjan, Shirvan, Orumieh and Ardebil Experimental Stations in 1998 to 2001 cropping seasons. The experimental design in all the locations was randomized complete block design with four replications. In each location simple and combined analysis of variance were implemented. Based on homogeneity of error variances, combined analysis of variance was done over locations and years. Results showed that interaction effect of genotype × year × location was significatn at 1% probability level. A significant difference was also found among the genotypes, and genotypes No. 4(Azar 2) and No. 10(sbn/ 1-64-199) with 1635 and 1597 kgha^-1produced the highest the highest grain yield respectively, sardari(the check cultivar) produced 1485 kgha^-1 of grain yield. Result of stability analysis on grain yield using parametric method of C.V.% and Lin and Binns, and non-parametric method of rank, showed that genotypes No. 4(Azar 2) No. 16(Sardari) and No. 10(Sbn/1-64-199) were the most stable genotypes. Overall based on the mean of grain yield, stability parameters and diseases results, genotype No. 10(Sbn/ 1-64-199) was found to be the highest yielding, most stable and resistant to yellow rust genotype, therefore it was selected as a desirable genotype.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Journal: 

Seed and Plant

Issue Info: 
  • Year: 

    2003
  • Volume: 

    19
  • Issue: 

    2
  • Pages: 

    20-20
Measures: 
  • Citations: 

    3
  • Views: 

    1870
  • Downloads: 

    0
Abstract: 

In cold regions, for successful wheat production close attention must be paid to all factors that influence a plant ability to attain maximum winterhardiness and grain yield. In this study the effects of sowing depths on grain yield and winter survival of winter bread wheat (Triticum aestivum L.) was studied in cold regions of Ardabil. An experiment was set up in a randomized block design with four sowing depth treatments (4, 7, 10 and 13 cm) in three replications for two years(1992-93). The results showed that the grain yield was significantly (P<0.01) differed. The highest yield and less winterkill were obtained from shallow seeding treatment (4 cm). Increases in seeding depth resulted in significantly (P < 0.01) low yield and high winterkill. The relationship between grain yield (Y) and sowing depths was described by a polynomial equation: Y=1.808-158.5X+5.523X__2 where this curve accounted for 91% observed variation in grain yield. It can be concluded that in cold regions of Ardabil, shallow planting compared to deep planting can increase grain yield and minimize winterkilling of winter wheat cultivars.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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