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当前位置: 首页 > 文章 > 珍稀濒危植物巴东木莲胚胎学研究(英文) 植物研究 2008,28 (6) 19-24
Position: Home > Articles > Megasporogenesis,Microsporogenesis and Development of Gametophytes in the Rare Endangered Plant Manglietia patungensis Hu Bulletin of Botanical Research 2008,28 (6) 19-24

珍稀濒危植物巴东木莲胚胎学研究(英文)

作  者：
陈发菊;李凤兰;梁宏伟;姚露;何正权
单  位：
三峡大学生物技术研究中心;北京林业大学生物科学与技术学院
关键词：
巴东木莲;大孢子发生;小孢子发生;雌雄配子体发育
摘  要：
对巴东木莲(Manglietia patungensis Hu)的花发育以及胚胎发育过程进行了系统研究。巴东木莲花顶生,花器官头年年底开始分化到第二年3月分化出花被、雌雄蕊群直至6月发育成熟。雌蕊成熟时胚珠倒生,双珠被,厚珠心,大孢子四分体线形排列,合点端发育成功能大孢子,珠孔端的3个退化,大孢子为单孢子发生型,胚囊发育方式属蓼型;雄蕊花药外侧壁玫瑰红色,内侧有4个白色花粉囊,绒毡层有1层多核细胞,小孢子四分体排列方式多为左右对称形和交叉形,四面体形,偶为T字形和线形,成熟花粉粒为二细胞型。在巴东木莲花发育和大、小孢子发生以及雌、雄配子体形成过程中未见异常现象,因此笔者认为该物种的花器官发育以及雌、雄配子体发育并不构成导致该物种濒危的因素。
译  名：
Megasporogenesis,Microsporogenesis and Development of Gametophytes in the Rare Endangered Plant Manglietia patungensis Hu
作  者：
CHEN Fa-Ju1,2 LI Feng-Lan2 LIANG Hong-Wei1 YAO Lu2 HE Zheng-Quan1(1.Biotechnology Research Center,and Hubei Province Key Laboratory of Natural Products Research and Development,China Three Gorges University,Yichang 443002) 2.School Biological Science and Biotechnology,Beijing Forestry University,Beijing 100083)
关键词：
Manglietia patungensis Hu;megasporogenesis;microsporogenesis;development of gametophytes
摘  要：
A detailed morphological description of megasporogenesis,microsporogenesis,and development of the male and female gametophytes in the rare endangered plant Manglietia patungensis Hu is presented for the first time after three-year’s continuous investigation.The ovule is anatropous,bitegmic,crassinucellate and with a obturator.No irregularities have been found in the process from the differentiation of archesporial cells to the formation of megaspores.The megaspore mother cells undergo miosis and develop into a linear tetrad.The large one at chalazal end is functional megaspore and developed into a polygonum type of embryo sac after the third mitotic division.Each anther of M.patungensis Hu with four sacs,a mature anther wall successively comprises an epidermis,endothecium,two-layered middle layer and one or two-layered glandular tapetum.The meioses of microspore mother cell is normal and cytokinesis is modified simultaneous type,and tetrads are tetrahedral,decussate and isoblateral,occassionally linear.The pollen grains are monocolpate and two-celled at shedding and the pollen grains germination rate is more than 90%.These results indicate that the key factors for the low seeding rate do not involved the development process of male and female gametophytes.

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