Changes of Polygalacturonase, Pectin and Ultrastructure of Cell Wall in Kiwifruit during Senescence
YangDexing, Dai Jingjing, Pang Xiangyu, Xing Honghua, and Wang Lanju (Biology Institute, Henan Academy of Sciences, Zhengzhou 450003)
This paper studied the changes of polygalacturonase (PG) activity, pectin contents in kiwifruit ( Actinidia deliciosa C. F Liang et A. R. Ferguson, cv. Qinmei) and the ultrastructure of the cell wall. The results indicated that ethylene production of kiwifruit gradually increased after picking, at the same time PG activity rised quickly. The protopectin content of the fruit decreased and soluble pectin content of the fruit increased. Then fiber of the cell wall relaxed, followed by the gradual disappearance of the cell organelles. At last, the flesh firmness of kiwifruit decreased. There was a negative correlation between the PG activity and the firmness of fruit.
【Fund】： 国家自然科学基金;; 河南省自然科学基金资助项目