Terpenoid Accumulation in Hypocotyls of Cotton Seedlings During Aging and After Infection by Rhizoctonia solani

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Abstract
The resistance of cotton [Gossypium hirsutum] seedlings to R. solani increased 5-12 days after planting. Concentrations of the terpenoids desoxyhemigossypol, desoxy-6-methoxyhemigossypol, hemigossypol, 6-methoxyhemigossypol, gossypol, 6-methoxygossypol and 6,6''-dimethoxygossypol were higher in extracts of healthy hypocotyls of 12 day old cotton seedlings than in those of 5 day old seedlings. The concentration of each compound in hypocotyls of either age increased even more for the first 48 h after inoculation with R. solani. However, rates of postinfection increases in concentrations of the compounds were not significantly different between 5 and 12 day old seedlings. Terpenoid compounds may be involved in the age-related increased resistance of cotton seedlings to R. solani because of differences in concentrations occurring before infection or in total concentrations present after infection. However, the toxicity of the terpenoid compounds to R. solani must be thoroughly tested before it is known whether they play an active part in the age-related resistance.

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