Factors influencing spore germination,appressoria formation and disease development inCamellia sinensis byGlomerella cingulata |
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Authors: | U Chakraborty G Das B N Chakraborty |
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Institution: | (1) Plant Pathology Laboratory, Department of Botany, University of North Bengal, 734 430 Darjeeling, West Bengal, India |
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Abstract: | Factors associated with conidial germination and appressoria formation ofGlomerella cingulata causing the brown blight disease of tea (Camellia sinensis) were studiedin vitro. Spore germination and appressoria formation were optimum at a temperature of 25°C, pH 5.0, 7 h light/day regime and a 24-h
incubation period. At a concentration of conidia of 1200/μL 10-d-old culture,G. cingulata exhibited a maximum germination and appressoria formation. A maximum production of lesions was also evident on detached tea
leaves at this spore concentration and in diffuse light. Diffusates of a phenolie nature collected from tea varieties susceptible
and resistant toG. cingulata inhibited spore germination and appressoria formation. Diffusates from resistant varieties were more fungitoxic than those
from susceptible varieties. Some phenolics known to be present in tea leaves, when testedin vitro, exhibited varying degrees of fungitoxicity. Pyrogallol totally inhibited spore germination, while pyrocatechol and phloroglucinol
completely inhibited appressoria formation. |
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