Slow wilting components in pigeonpea (<Emphasis Type="Italic">Cajanus cajan</Emphasis>(L.) Millsp.) |
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Authors: | Parimal Sinha S K Biswas |
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Institution: | (1) Division of Plant Pathology, Indian Agricultural Research Institute, New Delhi, 110012, India;(2) Department of Plant Pathology, CSAUA&T, Kanpur, India |
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Abstract: | Partial resistance to Fusarium wilt was characterized based on root inoculation on seven pigeonpea genotypes with a virulent
isolate of Fusarium udum. Resistance to wilt seems to be mainly due to localization of the pathogen in roots and vascular systems in the stem. Three
components of resistance (wilting rate or incubation period, weighted wilt index and number of colonized plants) were determined
and compared to those of susceptible genotypes Bahar and TTB7. There were significant differences between the genotypes for
the resistance components. The mechanisms of resistance in the genotypes appeared to be different, with genotype ICP8863,
having a longer incubation period, minimum wilt index and minimum pathogen colonization as compared to other resistant genotypes
(ICP9174, ICP87119 and ICP8858). Wilting rate or incubation period and number of colonized plant were significantly correlated
with resistance in adult plants in the field (AUDPC). Wilt index was useful in discriminating between genotypes that had a
similar incubation period and number of colonized plants. The partial character of resistance is probably based on quantitative
differences in localization capacity among the genotypes. A quantitative relationship between components, incubation period
and number of colonized plants and the AUDPC, if verified for a large number of genotypes, may be used to obtain an index
of resistance that may predict resistance levels in the field. |
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