极度濒危植物西畴含笑的大小孢子发生及雌雄配子体发育
Mega- and Microsporogenesis and Development of Female and Male Gametophytes of Michelia coriacea (Magnoliaceae), a Globally Critical Endangered Plant in South-East Yunnan of China
查看参考文献21篇
文摘
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用石蜡切片法对极度濒危植物西畴含笑(Michelia coriacea) 的大小孢子发生和雌雄配子体发育过程进行观察。西畴含笑的花药为四囊型, 花药壁5~7 层, 腺质绒毡层; 小孢子形成时胞质分裂方式为修饰性同时型; 四分体排列方式多为四面体型和十字交叉型, 偶为不规则形状; 成熟花粉粒为二细胞型。西畴含笑的胚珠倒生, 双珠被, 厚珠心; 大孢子母细胞减数分裂形成线形四分体, 合点端大孢子为功能大孢子, 胚囊发育类型为蓼型。西畴含笑胚胎学特征与木兰科多数种类一样, 均表现出胚胎发育的原始性。西畴含笑大小孢子发生和雌雄配子体发育过程中存在严重异常发育特征, 这可能是导致其结实率低的重要原因。 |
其他语种文摘
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The mega- and microsporogenesis and development of male and female gametophytes of Michelia coriacea were investigated using paraffin section method. The anther of the species was tetrasporangiate and its anther wall was composed of 5-7 layers cells, and the tapetum belonged to glandular type. In the meiosis of microsporocyte, cytokinesis was modified simuhaneous type. The tetrads were tetrahedral, decussate and sometimes were anomalous type. Mature pollen grain was two- celled. The ovule was anatropons, hitegmic, and crassinucellar. The megaspore mother cell undergone meiotic divisions and developed into a linear type of tetrads. The chalazal megaspore of the tetrad was functional. The functional megaspore under- went three sueeessively nuclear divisions to give rise to eight-nucleate embryo sac which was Polygonum Type. The high percentage of abortion could be observed in process of megaspore and microspore genesis and the development of gemetophytes. The abnormality in the reproductive development of this species might be the main cause of its extremely low seed set. |
来源
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云南植物研究
,2008,30(5):549-556 【核心库】
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关键词
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西畴含笑
;
大小孢子发生
;
配子体发育
;
败育
;
极度濒危
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地址
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1.
中国科学院昆明植物研究所昆明植物园, 云南, 昆明, 650204
2.
文山州林业局种苗站, 云南, 文山, 663000
3.
广西德孚自然保护区, 广西, 百色, 533000
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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0253-2700 |
学科
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植物学 |
基金
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国际植物园保护联盟(BGCI)项目
;
云南省中青年学术和技术带头人后备人才培养基金
;
野生动植物保护国际(FFI)项目
;
中国木兰科项目(6206/R4331)
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文献收藏号
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CSCD:3415040
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