摘要:
通过对羊奶果的大、小孢子发生和雌雄配子体发育的研究,结果表明,大孢子的发生滞后于小孢子,小孢子母细胞完成减数分裂Ⅰ期时,大孢子的发生还只处于孢原细胞时期,授粉后,大孢子可能受到某种刺激作用而加速发育,二者的发育进程和谐且都较快,一般在7 d之内完成。绒毡层发育为腺质型,胞质分裂为同时型,成熟花粉为3细胞型。倒生胚珠,基底胎座,厚珠心,双珠被,蓼型胚囊,孢原细胞直接长大成大孢子母细胞、反足细胞退化早。
关键词:
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羊奶果
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大孢子
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小孢子
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雌配子体
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雄配子体
Abstract:
The megasporogenesis,microsporogenesis and the development of female and male gametophyte of Elaeagnus conferta Roxb.were studied.The results showed that the microsporogenesis rate was higher than megasporogenesis rate.The microsporogenesis had completed meiosis I,while the megasporogenesis was still in the archesporial cell stage.The macrospore development quickened after fertilization,and finished within 7d.The mature pollen grains were 3-celled,and the tapetum belonged to the secretory type.The characteristics of the female gametophyte development were: anatropal ovule,basal placenta,thick nucellar,two integument,archesporial cells grown directly into megaspore mother cells,early degeneration of antipodal cell,and the development of the polygonum type embryo sac.
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