Abstract
Low carbohydrate levels in abscising organs have been considered an inducing factor in the process of abscission and thus, could be involved in the reported effects of light on the abscission process. Red (abscission inhibiting) and far-red (abscission accelerating) light in present work, however, produced no significant differences in total soluble sugar or starch content in the leaf blades of cuttings from mung bean ( Vigna radiata (L.) Wilczek cv. Jumbo), a plant where light regulation of abscission has been demonstrated. The soluble sugar content in the leaf cuttings decreased dramatically in the first 24 h and then stabilized at low levels in the remaining days under all light treatments. Starch content decreased slightly in leaves exposed to red or far-red light as compared with the level of starch measured in freshly cut leaves. Red light treated leaves maintained a significantly higher level of glucose 6-phosphate in the leaf tissue when compared with leaves under far-red or dark treatment. Loading the tissue with sucrose, a sugar reported to affect organ abscission, did not change the effect of light on abscission.
Published Version
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