National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Forty isolates of Alternaria brassicae extracted from the leaves and pods of rapeseeds and mustard collected from all the agro-climatic zones of Assam were studied for variability. The average conidial length and breadth of the isolates varied from 34.99µm to 46.36µm and 5.16µm to 9.72µm; and beak length from 4.01µmto 18.00µm. Numbers of horizontal septa and longitudinal septa ranged from 4.95 to 8.56 and 0.00 to 0.48, respectively. Four distinct colony colours - whitish gray; dark and brownish gray; gray, and greenish were identified. The isolates were compressed, slightly compressed, fluffy and slightly fluffy. Shapes of the colonies were either circular or irregular. The growth pattern was slow (0-40mm), medium (41-60mm) and fast (61-90mm). Molecular characterization revealed highest similarity (0.435) between Dhemajiand Darang isolates. Maximum dissimilarity (0.00) was observed between Jorhat isolate and Dhubri isolate, and between Sivsagar and Dhubri. The dendrogrambased on similarity index generated four clusters with 7, 15, 11and 7 isolates.
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