Abstract
Reactions of Brassica napus var. oleifera stems to two isolates of Leptosphaeria maculans , differing in aggression, were studied by TEM, SEM X-ray microanalysis and flame spectrophotometry. The common reactions associated with resistance were lignification of walls and, rapid, specific accumulation of calcium. Injection—infiltration of calcium accelerated delimitation of lesions, Calcium accumulated mainly at the surface of secondary cell walls within and around the perimeter of lesions in association with previously induced lignin co-polymers. It is suggested that this event is involved in resistance and its likely general significance is discussed.
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