黄瓜种子成熟前后的生理指标变化

Some Physiological Changes During Cucumber Seed Maturation

以高代自交系137-h华北型黄瓜为试材,探讨了黄瓜种子成熟前后的生理指标变化。结果表明,随着采收期的延长,黄瓜种子的发芽率、发芽势和千粒质量先增长后降低,在32～35d达到最高峰;种子中蛋白质含量、SOD活性和POD含量先增长后降低,而果肉中蛋白质含量、SOD活性和POD含量先降低后升高又降低,并且种子中蛋白质含量、SOD活性和POD含量峰值较果肉中出现的稍晚;种子中α-淀粉酶活性持续降低,脱氢酶含量先升高后降低,可溶性糖含量与淀粉含量呈负相关增长,随着种子的发育进程,可溶性糖向淀粉转化。

An inbred line 137-h was used to investigate the physiological changes during seed maturation of cucumber. Dur- ing cucumber seed development germination rate, germination vigor and thousand seed weight increased first and then decreased, and reached a peak at 32-35 days after pollination. Seed protein content, SOD activity and POD content levels increased first and then decreased. However, flesh protein content, SOD activity and POD content levels went through and pattern of decrease-increased-decreased. The peaks of seed protein content, SOD activity and POD content appeared later than the flesh. The activity of or-amylase in seeds continued to decrease during seed development. The dehydrogenase content increased first and then decreased. Soluble sugar content was negatively correlated with starch content, and soluble sugar converted into starch at late stage of seed development.