Influence of root exudates of cacao and other plants on spore development of Phytophthora palmivora

Root exudates of Theobroma cacao L. and 20 other genera were examined for their chemotropic influence on zoospore movement and development following germination of Phytophthoa palmivora sporangia. Occasional inhibition of sporangial germination was found. Directional response by zoospores was noted in most cases to the dialyzable fraction of the exudates, this response frequently being greater to exudates of plants other than cacao. Zoospore germination and development, however, were markedly inhibited in all nondialyzed extracts, except those of cacao and Poinciana regia. Completely dialyzed cacao exudates also partially inhibited zoospore germination and induced zoospore encystment. Both percentage of zoospore germination and mean length of germ tubes were greater in root exudates of 2 cacao selections highly susceptible to Phytophthora pod rot than in exudates of 2 solutions showing some degree of resistance. Exudates of most plants tested appeared to consist of dialyzable and nondialyzable fractions which respectively stimulated and inhibited zoospore germination.

Bibliographic Details

Main Author:	125874 Turner, P.D.
Format:	biblioteca
Published:	Nov
Subjects:	THEOBROMA CACAO, POINCIANA REGIA, PHYTOPHTHORA PALMIVORA, ENFERMEDADES FUNGOSAS, EXUDADOS, RAICES, ESPORULACION,
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