黄瓜种子乙烯释放量酶活性与品种性型的关系

The Relation of Sex Expression of Cucumis Sativus to Endogenous Ethylene Releasing and the Oxidase Activity in the Germination Stage

用节成性不同的黄瓜品种,研究了种子萌发中乙烯释放量,过氧化氨酶(CAT)、过氧化物酶(POD)活性与品种性型表现的关系。结果表明,刚吸胀的种子无乙烯释放,将萌发时乙烯量迅速上升,萌发盛期出现第一个高峰,们根出现时达最高峰,后陡降,CAT和POD活性在种子萌发中波动上升;三者均与雌花节率呈正相关,相关系数分别为0.9925＊＊,0.9768“,0.9481“。乙烯直接影响性型,CAT和PO D通过乙烯影响性型,与乙烯释放量的相关系数依次为0。9964”“和0.9959””·

The variations in ethylene releasing and the activities of catalase and per-oxidase during seed germination and the relation of sex expression to them were studied using cucumber cultivars with significant different percentage of female flower nodes. The results showed that there was no release of ethylene just when seeds became swelling;the release of ethylene increased sharply just before seed germination ;the first releasing peak appeared when the side roots were obviously elongated; After that the curve steeoly fell; the catalase and peroidase reached high activity after seeds became swelling. The activities fluctuatedly went up during seed germination. The posityve correlations found among the percentages of female flower nodes of different cultivars and the activities to catalase and peroxidase. The correlation coefficient was 0. 9925,0. 9768 and 0. 9481 respectively. Ethylene affected the sex expression directly, and CAT and POD affected the sex expression through ethylene. The correlation coefficient in relation with the release of ethylen was 0. 9964 and 0. 9959 respectively.