蟠桃果实发育成熟过程中果肉细胞超微结构的变化

目的]研究两种不同熟期蟠桃果实发育成熟过程中细胞超微结构的变化.方法]以早露蟠桃和英格尔蟠桃为材料,采取盛花后不同发育时期的果实确定单果重变化趋势,并据此对相应发育时期果实果肉组织进行固定切片、透射电镜观察.结果]早露蟠桃在果实发育初期及果重迅速增大期超微结构差异不大,细胞壁结构完整;果实发育后期细胞壁中胶层开始溶解,至盛花后70 d时细胞壁明暗分区结构已丧失;英格尔蟠桃在果实发育后期可观察到结构完整的线粒体等细胞器,至盛花后110 d仍可观察到细胞壁的明暗分区结构.结论]细胞超微结构分析认为英格尔蟠桃耐贮性优于早露蟠桃;英格尔蟠桃果实的适宜采收期可根据采后用途的不同来确定.

Ultrastructural Change of Flat Peach Fruit during Fruit Development and Ripening

【Objective】 Ultrastructural changes were determined in the flesh of the two different flat peach fruits.【Method】 Changes of fresh weight on flat peach fruit(Prunus persica L.Batsch cv Zaolu,cv Yingger) were determined during the fruit development after fully blossom.And the fruits were sampled,fixed and their sections were observed under transmission electron microscopy.【Result】 The results showed that there was no significant ultrastructural difference between the early stage and the fresh weight rapid-increasing stage of fruit development in Zaolu fruit.Striking changes in the structure of the cell wall were noted during the later stage,beginning with dissolution of the middle lamella.In Yingger fruit,a large degree of ultrastructural organization,especially the mitochondria was retained at the later stage of the fruit development and the structure of the cell wall was still kept after 110 days.【Conclusion】 Ultrastructural analysis shows that Yingger fruit has the higher storability than Zaolu fruit and the optimum harvest dates would be decided by the different usages of the fruit.