Germination of Sporangia of Phytophthora palmivora (Butl.) Butl.
Sporangia of Phytophthora palmivora germinated by either forming germ tubes or producing zoospores. Two distinct modes of germ-tube development have been described. Sporangia in distilled water formed zoospores at 10-34 centigrade grade with an optimum at 22 centigrade grade but germinated by means of germ tubes at 30 and 34 centigrade grade only. Zoospore formation was inhibited to varying degrees by cocoa pod extract, 1.0 percent (w/v) peptone and yeast extract, 100-500 millimicron 1 exponent -1 thiamine, and by very low concentrations of several amino acids, carbohydrates, and inorganic salts. Germ-tube formation was encouraged at 22 centigrade grade by 1.0 percent (w/v) peptone and yeast extract, by cocoa pod extract and exudate, 10 mM CaCl2, 1-10 mM MgSO4.7H2O), 0.5 percent (w/v) fructose, galactose, glucose, lactose, maltose, and sucrose, by 100 ppm arginine, aspartic acid, glutamic acid, glycine, leucine, and tryptophane, and by 100-500 millimicron 1 exponent -1 thiamine
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| Format: | biblioteca |
| Published: |
1972
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| Subjects: | PHYTOPHTHORA PALMIVORA, THEOBROMA CACAO, PODREDUMBRES, ENFERMEDADES FUNGOSAS, ZOOSPORAS, ESPORULACION, TEMPERATURA, NUTRIENTES, SALES, |
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