Accumulation of antifungal compounds in tea leaf tissue infected withBipolaris carbonum |
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Authors: | B N Chakraborty A Saha |
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Institution: | (1) Plant Pathology Laboratory, Department of Botany, University of North Bengal, P.O.-N.B.U. 734 430, Dt.-Darjeeling, West Bengal, India |
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Abstract: | Varietal resistance of tea towardsBipolaris carbonum was tested following detached leaf inoculation technique. Among the fourteen varieties tested, three were found to be highly
susceptible, while other three were resistant. Leaf exudates and diffusates collected from the resistant varieties were more
fungitoxic than those from the susceptible ones. Two antifungal compounds isolated from healthy andB. carbonum-infected tea leaves exhibited clear inhibition zones atR
F 0.8 and 0.65, respectively, in a chromatographic bioassay. On the basis of their color reaction on TLC and UV-spectra these
were identified to be catechin and pyrocatechol. Resistant and susceptible varieties accumulated 439–510 and 187–212 μg/g
fresh mass tissue of pyrocatechol, respectively, 2 d after inoculation withB. carbonum, while a low concentration (45–58 μg/g) of this compound was detected in healthy leaf tissue. |
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