葡萄果实发育后期脱落酸来源的研究

  以‘品丽珠’(Vitis vinifera L. cv. Cabernet-Franc) 葡萄为试材, 对发育后期果实中脱落酸(ABA) 的来源进行了研究。结果表明, 叶片合成的ABA 可能是果实中ABA 的重要来源, 而根部ABA 的合成对果实中ABA 含量贡献不大。种子中ABA 的合成可能不是果肉中ABA 的重要来源。果实具有独立合成和降解ABA 的能力。对果实内ABA 含量变化的代谢调控问题进行了讨论。

A Study of the Sources of Abscisic Acid in Grape Berry during Its Late Developmental Phases

Abscisic acid(ABA)has been considered as a trigger in grape fruit ripening. Potted 'Cabernet Franc'grapevines( Vitis vinifera L.)were used in the experiment to determine the sources of ABA in grape berry.The results showed that ABA synthesized in leaves could be rapidly and efficiently transported into a grape berry,and constituted an important source of ABA in the fruit.Although the ABA synthesized in roots,especially induced by water stress,could be transported into the fruit,it did not contribute much to the ABA content in grape berry.ABA biosynthesized in seeds seemed unlikely to be an important source of ABA in the flesh of grape berry.ABA was efficiently biosynthesized and catabolised independently by a grape berry,which could mediate ABA concentration in the fruit tissues through their ABA metabolic system in favor of the berry development.