作　　者： ; ;

机构地区： 华南热带农业大学农学院

出　　处： 《草地学报》 1999年第2期136-141,共6页

摘　　要： 对西卡柱花草传粉受精过程花朵形态变化的研究结果表明，凌晨3～6时，多数花蕾进行自花授粉，6～7时，花蕾完成自花授粉过程，此时导管与花冠长度几乎相等。上午8：30～9：30，小花开放但龙骨瓣仍闭合时，花粉粒在柱头上萌发。开花后3小时，龙骨瓣松开，露出雌雄蕊，花粉管穿过花枝道、子房内壁进入胚珠。花后6小时左右，小花关闭，合子及初生胚乳核中出现雄性核仁。小花开放过程中的形态变化可作为传粉、花粉萌发、受精作用的形态指标。 The flower morphological changes of Stylosanthes scabra cv. Seca during self-pollination andfertilization were studied. The results show that most of the flowers take place self-pollination from 3 to 6am. Almost all the flowers have accomplished polIinating at 6~7 am when the calyx tube is the samelength as corolla. The pollen grains sheded on the stigma begin to germinate from 8: 30 to 9: 30 in themorning when the flowers are blooming with the keels still closed. The two keels loosen as a result thestamen and pistels extend out of the keels and the pollen tubes grow down through the stylar canal 3 to 4hours after blooming. The flowers closed 6 hours or so after blooming while male nucleolus appers in thezygote and primary endosperm respective1y. It is suggested that the flowers morphological chamge duringtheir blooming may be a sign of time for self-pollinating, pollen grain geminating and fertilization.

关 键 词： 西卡柱花草 传粉 受精作用 花朵形态变化

领　　域： [农业科学]