段学武,张昭其,季作梁

• 1:华南农业大学园艺系!广东广州 510642
• 2:华南农业大学园艺系!广东广州 510642
• 3:华南农业大学园艺系!广东广州 510642

摘要(Abstract)：

多聚半乳糖醛酸酶（PGs）是一种在细胞壁结构的改变中起重要作用的酶，它可以催化果胶分子中α～（1、4）－聚半乳糖醛酸的裂解，从而参与果胶的降解，它与果实的软化密切相关。PGs具有2或3种同工酶，它们分别出现于果实发育的不同阶段。PGs是由多基因家族编码的，各基因家族成员分别调节不同时空的表达，通过反义RNA技术和插入失活的方法可对PG基因进行调控。乙烯在翻译水平控制PG基因的表达而对PGmRNA的转录没有影响。气调贮藏、热处理、钙处理等贮藏措施能抑制果实PG酶的活性，延缓果实的后熟软化进程。综述了多聚半乳糖醛酸酶（PG酶）在果实成熟中的作用、PG酶同工酶、PG酶基因及其表达调控、乙烯及贮藏措施对PG酶活性和果实软化的调控。

关键词(KeyWords)： 多聚半乳糖醛酸酶;果实;软化

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 段学武,张昭其,季作梁

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