PATHOGENIC VARIABILITY OF SUGAR BEET ISOLATES OF RHIZOCTONIA SOLANI

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MAHMOODI B.; MESBAH M.; ALI ZADEH A.

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

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Journal: IRANIAN JOURNAL OF PLANT PATHOLOGY Year:2004 | Volume:40 | Issue:3-4 Page(s): 253-280

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Title

PATHOGENIC VARIABILITY OF SUGAR BEET ISOLATES OF RHIZOCTONIA SOLANI

Author(s)

MAHMOODI B. | MESBAH M. | ALI ZADEH A. | Issue Writer Certificate

Keywords

RHIZOCTONIA SOLANI AG-2Q4

AG-4Q4

PATHOGENIC VARIABILITYQ4

ISOLATE-CULTIVAR INTERACTIONQ2

SUGAR BEETQ2

IRANQ2

Abstract

Relative virulence of 131 Rhizoctonia solani isolates was evaluated in in vitro and in greenhouse conditions. Of these, 44 isolates belonged to AG-2, 58 to AG-4 and the rest of them were classified as unknown AG-group. For in vitro tests, germinating seeds of a susceptible line (261) were placed on the periphery of actively growing colony of R. solani on Water Agar (WA). Disease severity of seedlings was measured 3, 5, and 7 days after inoculation on thc basis of 0-4 scale. On the basis of Area Under, Disease Progress Curve (AUDPC), R. solani AG-4 isolates were grouped into 26, AG-2 isolates, into 17and unknown isolates into 11 using Duncans' multiple range test. High correlation was found between 2nd recording date (five days after inoculation) and AUDPC (r=0.92; P= 0.05). Virulence degrees of the selected isolates of clustering analysis trom AG-4 and AG-2 and unclassified isolates were compared. Results showed that the isolate Rh124 (AG-4) collected from Kermanshah was the most virulent, while Rh 157(AG-4) isolate colleted from Khorasan was the least one.Studies on the virulence of selected isolates of AG-4 and AG-2 (belonging to high and low virulence group in ill vitro test) in greenhouse condition, in which seedlings and adult plants were inoculated confirmed different degree of virulence and also showed that the range of variability in the virulence of AG-4 isolates were more than of AG-2 isolates. The Rh 157 (AG- 4) was the least pathogenic isolate on seedling and adult plants. The AG-2 isolates were more virulent than AG-4, when inoculated on adult plants.In the third part of this research, an experiment was conducted using mixed isolates of AG-4 and AG-2 to inoculate adult SUGAR BEETs. A mixture of 4 high virulent and 4 low virulent isolates of AG-4 used as treatments 1 and 2. Similarly, the same mixtures of AG-2 isolates employed as treatments 3 and 4. Results indicated that, there was no major difference in the degree of virulence between highly virulent isolates of AG-4 and AG-2 groups.In an in vitro test, the interaction of 4 isolates belonging to AG-4 and AG-2 of varying degree of virulence with 6 SUGAR BEET genotypes of different levels of resistance to Rhizoctonia was evaluated. The results showed that SUGAR BEET genotypes with various degree of resistance are more easily differentiated by inoculating AG-2 isolates than AG-4.

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APA: Copy

MAHMOODI, B., MESBAH, M., & ALI ZADEH, A.. (2004). PATHOGENIC VARIABILITY OF SUGAR BEET ISOLATES OF RHIZOCTONIA SOLANI. IRANIAN JOURNAL OF PLANT PATHOLOGY, 40(3-4), 253-280. SID. https://sid.ir/paper/48370/en

Vancouver: Copy

MAHMOODI B., MESBAH M., ALI ZADEH A.. PATHOGENIC VARIABILITY OF SUGAR BEET ISOLATES OF RHIZOCTONIA SOLANI. IRANIAN JOURNAL OF PLANT PATHOLOGY[Internet]. 2004;40(3-4):253-280. Available from: https://sid.ir/paper/48370/en

IEEE: Copy

B. MAHMOODI, M. MESBAH, and A. ALI ZADEH, “PATHOGENIC VARIABILITY OF SUGAR BEET ISOLATES OF RHIZOCTONIA SOLANI,” IRANIAN JOURNAL OF PLANT PATHOLOGY, vol. 40, no. 3-4, pp. 253–280, 2004, [Online]. Available: https://sid.ir/paper/48370/en

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