Secondary sporangium formation in Phytophthora palmivora (Butl.) Butl

Very few sporangia of Phytophthora palmivora germinated directly and produced secondary sporangia in distilled water and in solutions of amino acids and carbohydrates at 30 °C. Although 1.0 per cent (w / v) peptone and yeast-extract stimulated a high percentage of germination by formation of germ tu...

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Bibliographic Details
Published in:Annals of botany 1981-01, Vol.47 (3), p.329-334
Main Authors: Manu, M, Clerk, G.C
Format: Article
Language:English
Subjects:
cocoa
fungi
germination
Phytophthora palmivora
sporangium
Theobroma cacao L
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Summary:Very few sporangia of Phytophthora palmivora germinated directly and produced secondary sporangia in distilled water and in solutions of amino acids and carbohydrates at 30 °C. Although 1.0 per cent (w / v) peptone and yeast-extract stimulated a high percentage of germination by formation of germ tubes, less than 1.0 per cent of the germinated sporangia produced secondary sporangia. Secondary sporangium formation was induced by transferring germinated primary sporangia from a nutrient medium of sufficiently high concentration to either distilled water or dilute solutions of organic and inorganic compounds immediately after emergence of the germ tubes. The percentage of germinated sporangia forming secondary sporangia was influenced by both the nature and concentration of the medium into which they were transferred. The secondary sporangia were significantly smaller than the primary sporangia.
ISSN:0305-7364
1095-8290
DOI:10.1093/oxfordjournals.aob.a086024