JOURNAL OF PLANT ENVIRONMENTAL PHYSIOLOGY
Year:2013 | Volume:8 | Issue:1 (29)|Papers Count:8

The full text of this article is the Persian language, please for the view full text, refer to Persian Please click here to view the full text of this article

The full text of this article is the Persian language, please for the view full text, refer to Persian Please click here to view the full text of this article

Western Dena protected area is one of the richest biodiversity in the country of Iran. The purpose of this study was to study in biodiversity variation of plant, canopy cover and communities in altitude layer in Dena Mountain. In this study, sampling was done randomly from vegetation-systematically in which 30 plots were determined by the method of the least species level. The percentage of each species, covering and the dominant species for each plot were determined and the area’s species were collected. For each plot geographical position and altitude, aspect and gradient percentage were recorded. Data into the excel and analyzed. The results showed that the most important factor for the area’s vegetation is altitude and the next important one is slope of the area. The floristic investigation in the 30 plot indicate that in the area had 212 plant species out of 24 plant families that is the 41 species endemic, 12 species of rare, one species is vulnerable and 7 one-genus species. in south slope from 2242 meter to 4359 meter form sea level with increasing. Altitude canopy cover percentage in plot decreased. These changes observed in the north Slope, from 2650 meter to 4350 meter form sea level tree, canopy cover percentage increased with decreasing altitude. In the area, there are the four formation tree, bushes, pulvinate plants, herbaceous plants and 22 plant populations. 22 plant communities in altitude layer and north and south slopes observed.

Salinity stress is a major constrain which limits agricultural and horticulture production in Iran and the world. To determine interaction effect of sodium chloride and calcium chloride on vegetative and reproductive growth of Fragaria ananasa (cv. Gamrosa). An experiment was carried out base on a randomized complete block design with factorial arrangment. Three levels of calcium chloride (0, 5 and 10 mg/l) and four levels of sodium chloride (0, 15, 30 and 45 mg/l with 3 replications) were studied. Measured traits were leaf fresh weight, petiole length, leaf number, fruit number and fruit weight, yield and total soluble solid (T.S.S) of fruit. Results showed that resistant of Fragaria ananassa against salinity stress was negligible. With increasing salinity levels total petiole length, fruit number, fruit weight decreased. With increasing salinity total yield increased significantly compared with control. Calcium treatment reduced detrimental effects of salt stress on the plant growth and increased fruit number and fruit weight and petiole length. Maximum ameliorative effect of calcium was observed in plants treated with 10Mm CaCl2. In all treatment, there were significant differences between sodium chloride and calcium chloride. Also sodium chloride and calcium chloride caused increased T.S.S content in fruit.

The full text of this article is the Persian language, please for the view full text, refer to Persian Please click here to view the full text of this article

In order to evaluate the effects of plant density and nitrogen fertilizer on phonological and agronomical characteristics of rapeseed (Brassica napis L.), an experiment was conducted as split plot arrangement based on Randomized complete block design at the west of Mazandaran during growing season of 2009-2010. Four nitrogen rates (0, 100, 200 and 300kg.ha-1) and three seed rates (6, 8 and 10 kg.ha-1) were used as main and subplot, respectively. Height to the first branch, height to the first pod, pod number on main stem, stem width, day number to the start of flowering stage, day number to end of flowering stage, duration of flowering stage, day number to maturity stage of rapeseed were measured. The result showed that the nitrogen application level had significant effects on pod number of main branches, day number to the start of flowering, day to end of flowering and day to maturity of rapeseed. The highest Pod number of main stem, day to start the flowering stage, day number to end of flowering stage and day number to maturity stage for 300 kg.ha-1 N treatment. Seed rates had significant effects on day number to start of flowering stage, day number to end of flowering stage, duration of flowering stage and day number to maturity stage. The highest pod number on main stem, day to start of flowering, day to end of flowering and day to maturity were observed for 6 kg.ha-1 seed rate.

Salinity is an environmental constrain for crop production and nowdays is a progressive problem in agriculture. This research was evaluated seed hydro-priming effect on some characteristic of Radish seed. After germination of Radish seed, final germination percent, germination rate, germination index and also seed vigor index and proline content of plumule and root was evaluated. The research was done in factorial experiment called completely randomized design with three replications. This research contains two factors: hydro-priming at four levels (0, 10, 15 and 20 hours) and salt stress at four levels (0, 4, 8, 12 ds/m). the result showed final germination and germination rate of hydro-priming was most effective at 15 hours and 4ds/m sodium chloride concentration. Also hydro-priming for 15 hours and 0 sodium chloride concentration caused improvement of germination index and there was no significant difference at 8 and 12 ds/m sodium chloride concentration. The most seed vigor index had observed at 10 hours and 4 ds/m sodium chloride concentration hydro-priming. Hydro-priming for 10, 15 and 20 hours and also at different sodium chloride concentration, in compare with no hydro-priming seeds (control), caused higher in proline content at plumule and root.

Nowadays environmental pollution is an important issue in different communities. Tehran oil refinery is one of the oldest refineries in Iran that the ecosystems around it are facing serious challenges because of oil pollution in parts of region. In a greenhouse study, the ability of Polypogon monspeliensis Yazd ecotype at remediation of Tehran's oil refinery petroleum polluted soils was examined. Thus, the amount of total oil and grease (TOG), before and 45 days after planting the one month seedlings to 5 different treatment where in those agricultural soil and contaminated soil in order to weight ratio of 1 to 9 (10%), 2 to 8 (20%), 3 to 7 (30%), 4 to 6 (40%), 5 to 5 (50%) were mixed together in comparison with the control treatments without vegetation with the same levels of pollution were analyzed. Results showed that this plant was able to decrease petroleum pollution significantly in 95% possibility level. The most decrease in amount of TOG is related to polluted soil 10% treatment that phytoremediation purification in this treatment was 69.33%. Results showed that with increasing concentration of TOG, its reduction rate in soil decreased. Studies of the parameters of shoot height and root fresh and dry weight showed that only in 50% treatment, a plant height decrease significantly incomposion with control treatment. In petroleum polluted 10 and 20% treatments, plant shoot height was increased. Root fresh and dry weight in 10, 20 and 30% treatments in comparison with control treatment without pollution is increased and in 40 and 50% treatments was decreased. Increasing in shoot height in 10 and 20% treatment and increasing in root fresh and dry weight in 10, 20 and 30% treatments showed that plant used petroleum compounds as nutrients or more activity of rhizospheric microorganisms in there treatments due to improvements of plant organs growth in comparison with control treatment without pollution.