Abscisic acid-glucose ester as an allelopathy agent from citrus fruit
Aqueousmethanol extracts of Citrus junos, C. unshiu and C. sudachi fruit peel inhibited the growth of the roots and hypocotyls of alfalfa (Medicago sativa L.), cress (Lepi dium sativum L.) and lettuce (Lactuca sativa L.) seedlings. Significant reductions in the root and hypocotyl growth were observed as the extract concentration in creased in all bioassays. The inhibitory activity of C. junos extract on the growth of test plants was 3.3- to 17.9-fold and 3.6- to 20.6-fold greater than that of C. unshiu and C. sudachi extracts, respectively.The concentration in C. junos was 3.5- and 4.9-fold greater than that in C. unshiu and C. sudachi, respectively. Thus, there was a good correlation- between abscisic acid-b-D-glucopyranosyl ester (ABA-GE) concentrations in C. junos, C. unshiu and C. sudachi fruit peel and the inhibitory activities of their extracts.The concentratio of ABA-GE in C. junos fruit peel was in creased with fruit maturity as growth inhibitory activity of C. junos fruit peel was reported to be in creased with fruit maturity, indicating that the concentrations of A BA-GEin C. junos fruit peel was correlated with growth inhibitory activity of C. junos fruit peel in time course of fruit maturation. These findings suggest that ABA-GE may be involved in the growth in hibitory effect of C. junos, C. unshiu and C. sudachi fruit peel.
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