Formation of phytoalexins within and outside lesions of Botrytis cinerea in French bean leaves

Abstract

Rapidly spreading lesions and lesions restricted in size developed in primary leaves of French bean (Phaseolus vulgaris) in response to infection byBotrytis cinera isolates BC-1 and BC-5, respectively. These isolates caused similar differential lesions in leaves of cucumber, flax, lettuce and tomato. To determine whether phytoalexin accumulation was correlated with the resistant reaction in bean leaves, accumulation of phytoalexins was examined in necrotic areas of both types of lesions and in their surrounding green tissues.