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Cyanogenesis in Green Tissues of Cotton Plants¹

A cyanogenic compound was present in extracts of nearly all tissues of cotton plants (Gossypium hirsutum L.), with the greatest amounts present in photosynthetic tissues. Measured as HCN evolved from aerated aqueous homogenates, amounts in leaves varied from 27 to 92 µg/g (fresh wt basis). No significant correlation was found with leaf age. Unlike other green tissues, carpel walls contained little cyanide. Cyanogenesis in cotyledons depended upon light. Turnover of the cyanogenic compound was also accelerated in light, with more than 50% of the pool of cyanogenic compound being metabolized each day.

Key Words: Cyanide • Asparagine • Photosynthesis • Gossypiun hirsutum L.

² Plant Physiologist, PSRD, Western Cotton Research Laboratory, 4135 E. Broadway, Phoenix, Ariz. 85040.

Received for publication February 28, 1972.