Fruit rot of Datura innoxia and microbial deteriorationof tropane alkaloids
2002
S. MANDAL | K.K. JANARDHANAN, M. ALAM, H.K. CHOU RASIA, A. SATTAR
Fruit rot was the most prevalent disease in experimental fields of Datura innoxia [D. fastuosa] at CIMAP, Lucknow, India, during January to April, 1995. The isolations from necrotic tissues and seeds of infected fruit samples invariably produced sixfungal cultures. Based on cultural and morphological characters, they were identified as Alternaria alternata, Alternaria solani, Bipolaris zeae, B. hawaiiensis, Curvularia lunata [Cochliobolus lunatus] and Fusarium pallidoroseum. The pathogenicity of all fungi was tested on detached fruits under laboratory conditions. A. alternata, B. zeae, B. hawaiiensis and F. pallidoroseum were highly pathogenic, whereas A. solani and C. lunatus were weak pathogens. Two major tropane alkaloids viz., hyoscyamine andscopolamine in D. innoxia fruits were considerably reduced following infection with each of the six fungal pathogens. Maximum deterioration in hyoscyamine and scopolamine content was recorded by B. zeae and F. pallidoroseum, respectively. However, C. lunatus and A. alternata, showed minimum deterioration in hyoscyamine and scopolamine, respectively.
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