Biosynthetic pathway of cucumber alcohol: Trans-2,cis-6-nonadienol via cis-3,cis-6-nonadienal

cis-3,cis-6-Nonadienal and cis-3-nonenal in Cucumis sativus were identified by comparison with synthetic specimens. The identification of these compounds, combined with biochemical evidence, suggests that cucumber alcohol and trans-2-nonenol are biosynthesized via cis-3-unsaturated aldehydes from linolenic and linoleic acid, respectively.     

Relation between Ribulose Bisphosphate Carboxylase Content and Chloroplast Number in Naturally Senescing Primary Leaves of Wheat

The amounts of ribulose bisphosphate carboxylase protein decreasedrapidly with leaf age to a low content by the middle stage ofsenescence. In contrast, the decrease in chloroplast numberwas slight during the same period. This indicates that the enzymecan be degraded within the chloroplast before the chloroplastsdisintegrate during senescence. (Received September 3, 1983; Accepted November 24, 1983)