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.
Main Author: | 125874 Turner, P.D. |
---|---|
Format: | biblioteca |
Published: |
Nov
|
Subjects: | THEOBROMA CACAO, POINCIANA REGIA, PHYTOPHTHORA PALMIVORA, ENFERMEDADES FUNGOSAS, EXUDADOS, RAICES, ESPORULACION, |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Similar Items
-
Behavior of Phytophthora palmivora in soil
by: 125874 Turner, P.D.
Published: (Feb ) -
Strains of Phytophthora palmivora (Butl.) Butl. from Theobroma cacao L., 2: Isolates from non-African countries
by: 125874 Turner, P.D.
Published: (1961) -
Oospore morphology and germination in the Phytophthora palmivora complex from cacao
by: 82260 Kaosiri, T., et al.
Published: (Set-) -
Comparative sporulation as an indication of resistance by cacao to Phytophthora pod rot
by: 125874 Turner, P.D.
Published: (Oct ) -
Método para induzir a esporulacao de Phytophthora palmivora (Butl.) Butl. em frutos de cacau
by: 111626 Rocha, H.M., et al.
Published: (1970)