Abstract
Mycolaminarans (water-soluble β-1,3-glucans) from Phytophthora cinnamomi, P. palmivora and P. megasperma var. sojae produced wilting symptoms on Persea indica, soybean, cacao and tomato at 0·01 to 0·5 mg/ml. The same symptoms were also observed with mycolaminaran phosphate, algal laminaran, pustulan (β-1,6-glucan) and carboxymethyl cellulose but different plant responses were produced by pectin and Carbowax and by the α-glucans, dextran and soluble starch. Plant responses to the mycolaminarans appeared to be caused by cellular toxicity rather than by vessel plugging because 14C-mycolaminaran became systematically distributed through P. indica plants and was entirely metabolized to various higher and lower size polymrs within 24 h. Low amounts of the neutral mycolaminaran (0·1 mg/ml maximum) were detected in filtrates of young log-phase cultures of P. megasperma var. sojae grown on synthetic medium.
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