Differential plant response to toxins and elicitor proteins released by the potato and tomato pathogens Alternaria solani and Alternaria alternata

Abstract Early blight of potato and tomato, caused principally by Alternaria solani , results in extensive damage to foliar tissues. Symptoms are seen as expanding necrotic lesions. Lesions sometimes surrounded a halo chlorotic tissue, however the basis for presence or absence distinctive have not been determined. To dissect lesion development series Alternaria-associated toxins potential elicitor proteins were tested tobacco. Infiltration leaves demonstrated that, while most pure did visible effect, two anthraquinones, bostrycin altersolanon A, elicited strong necrosis-mediated response. Extracts solid liquid cultures A. yielded anthraquinones that also Two identified cloned from brown spot early pathogens alternata solani, respectively. Agrobacterium-mediated infiltration expression xyloglucanase cel12-A Hrip1 revealed had no apparent whereas induced tissue death halos. Development halos was dependent on leaf age, with older exhibiting It is proposed specific toxin production, conjunction susceptibility mediate outcomes symptoms.