| 巴西橡胶树大孢子发生和胚囊发育过程的研究 |
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| 引用本文： | 邱德勃,谢石文.巴西橡胶树大孢子发生和胚囊发育过程的研究[J].热带作物学报,1991,12(1):1-9. |
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| 作者姓名： | 邱德勃 谢石文 |
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| 作者单位： | 华南热带作物学院热带作物系，华南热带作物学院热带作物系，华南热带作物学院热带作物系 |
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| 摘 要： | 用石蜡连续切片,观察巴西橡胶树胚珠和大孢子发生、胚囊发育过程,结果如下:1.倒生胚珠,胚珠原基在雌蕊心皮来完全愈合成完整子房前产生。珠被发生于造孢细胞末期或大孢子母细胞早期。至二核胚囊期,两层珠被顶部合拢包围珠心。2.具厚珠心,其顶部形成珠心喙;在珠孔上方有珠孔塞,它起源于胚珠附近的胎座组织。2.胚囊发育属于蓼型。发育过程一些明显的变化是:(1)细胞逐渐液泡化;(2)从单核胚囊开始,细胞核连续三次分裂、分化、定位和产生新壁形成七细胞胚囊;(3)出现极性,极性的表现在大孢子母细胞期就开始。4.一些品系的两性花中,雌、雄生殖细胞问各发育阶段有明显的对应关系。
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| 关 键 词： | 巴西橡胶树 大孢子发生 胚囊发育 |
MEGASPOROGENESIS AND DEVELOPMENT OF EMBRYO SAC OF HEVEA BRASILIENSIS |
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| Qiu Debo Xie Shiwen Kong Weiming.MEGASPOROGENESIS AND DEVELOPMENT OF EMBRYO SAC OF HEVEA BRASILIENSIS[J].Chinese Journal of Tropical Crops,1991,12(1):1-9. |
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| Authors: | Qiu Debo Xie Shiwen Kong Weiming |
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| Abstract: | Tie present paper reports the observations on the development of ovules, megaspores and embryo sacs.
1. Before carpels linked together entirely to form pistil, the ovule primordia appeared upon the placenta and developed into an anatropous ovule afterwards, Bitegminous phenomenon occured in sporogenous cell stage or early megaspore mother cell stage. The apex of the two integuments jointed and surrounded the nucellus completely up to two-nucleate embryo sac stage.
2. The ovule was crassinucellate with nucellar beak. And above the micropyle of the ovule there was an obturator which arised from placenta nearby.
3. Megasporogenesis was of polygonum type. During the development of embryo sacs, some obvious changes were observed: (1) gradual vacuolation of the cells; (2) three successive divisions, differentiations and localizations of the nuclei, beginning with one-nucleate embryo sac, to become ultimately a 7-cell embryo sac by the formation of new cell wall; (3) emergence of polarity which began from the stage of megaspore mother cell.
4. In some clones, the corresponding development stages between male and female reproductive cells in the same bisexual flower were evidently date-related. |
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| Keywords: | Hevea brasiliensis megasporogenesis embryo sac development |
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