细胞膜透性和两种内源激素对硬肉桃果实成熟前后硬度变化的影响

以硬肉桃新品种‘双久红’和常规品种‘川中岛白桃’（对照）果实为试材，分别对两品种果实成熟前后20d内的果实硬度、MDA、相对电导率及ABA、GA含量进行了测定。结果表明，自成熟前15d开始，‘双久红’果实的MDA、相对电导率、ABA含量均极显著低于‘川中岛白桃’的（P <0.01）；而前者的GA含量则是极显著高于后者（P <0.01）。相关性分析表明，两品种桃果实硬度与MDA、相对电导率、ABA含量呈极显著负相关（P <0.01）； 而GA含量与前者呈极显著正相关，与后者仅达到显著正相关水平（P <0.05）。

The Effect of Cell Membrane Permeability and Two Endogenous Hormones on Fruit Firmness of Crisp Peach before and after Ripening

Peach fruits of ‘Shuangjiuhong’ and ‘Kawanakajima Hakuto’ (control) were used to study the effects of MDA、relative conductivity、ABA and GA contents related to fruit firmness during 20 days before &; after ripening. The results showed that MDA content、relative conductivity and ABA content of ‘Shuangjiuhong’ were significantly lower than these of ‘Kawanakajima Hakuto’ (P<0.01); however, GA content of the former was significantly higher than that of the latter since the 15th day before ripening (P<0.01). Correlation analysis showed that it was fearfully marked negative correlation among the fruit firmness, MDA content、relative conductivity and ABA content in two cultivars (P<0.01)；it was fearfully marked positive correlation between the fruit firmness and GA content in ‘Shuangjiuhong’, and marked merely positive correlation between the fruit firmness and GA content in ‘Kawanakajima Hakuto’ (P<0.05).