Effect of culture filtrate of Fusarium udum and fusaric acid on wilt susceptible and resistant pigeonpea cultivars
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Authors
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R.N. PANDEY, S.E. PAWAR and C.R. BHATIA
Nuclear Agriculture Division, Blzabha Atomic Research Centre, Trombay Bombay 400 085
Keywords:
Culture filtrate, fusaric acid, Fusarium udum, pigeonpea, wiltAbstract
Wilt susceptible (TT6 and TAT10) and resistant (ICP 8863 and ICPL 84008) genotypes of pigeonpea were grown at different dilutions of the culture filtrate (CF) of the pathogen F. udum and mortality was recorded after 8-10 days. No differences between the resistant and susceptible genotypes were observed at 100, 50 and 25% concn of CF. Wilt susceptible genotypes showed higher wilting percentage than resistant genotypes at 10, 15 and 20% culture filtrate at 10, 8 and 6 days after treatment. Fusaric acid (FA) was detected chromatographically in the culture filtrate. A differential response similar to that of 10% culture filtrate treatments was observed when the seedlings were treated with 10 p.p.m. of commercial fusaric acid. Neither culture filtratenor fusaric acid was suitable for screening pigeonpea germplasm for wilt resistance as the % mortality in the resistant genotypes ranged from 20-27 for 10% CF and 26-32 for 10 p.p.m. FA.
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