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Effects of exogenous ABA,GA_(3) and cell-wall-degrading enzyme activity, carotenoid content in ripening mango fruit

Zhou Yuchan, Tang Youlin, Tan Xingjie, Guo Junyan

South China Institute of Botany, The Chinese Academy of Sciences. Guangzhou 510650, Guangdong

Abstract

The functions of PG and PME activities on postharvest softening of mango fruit and their relationship with the effects of exogenous ABA, GA_(3) and exogenous #beta#-carotene treatment were studied. The PG activities within mango fruit were unevenly distributed, with higher activity in upper and inner mesocarps than in the lower and outer ones. During ripening, PG activity increased significantly, then declined after reaching a maximun, but PME activity decreased gradually throughout the ripening process. Postharvest treatment with ABA caused an increase in PG activity, but GA_(3) treatment postponed the coming of PG activity maximum; neither ABA nor GA_(3) had consistent effect on the change of PME activity during mango ripening. GA_(3) treatment also lowered the rate of carotenoid increases, but ABA accelerated it throughout the ripening period. Postharvest treatment with #beta#-carotene also caused an increase in PG activity in ripening mango fruit, and the relation between color development and PG activity was discussed.

Key words: Mango fruit;PG;PME;ABA;GA_(3);Carotenoids;Softening

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Citing This Article：

Zhou Yuchan, Tang Youlin, Tan Xingjie, Guo Junyan. Effects of exogenous ABA,GA_(3) and cell-wall-degrading enzyme activity, carotenoid content in ripening mango fruit. Acta Physiol Sin 1996; 48 (4): (in Chinese with English abstract).