Embryology of the dioecious Woonyoungia septentrionalis (Magnoliaceae)
Embryology of the dioecious Woonyoungia septentrionalis (Magnoliaceae)
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雌雄异株的Woonyoungia septentrionalis（木兰科）的胚胎学
DOI：
10.1111/j.1756-1051.2011.01151.x
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发表时间：
2012-04
影响因子：
0.9
通讯作者：
Qingwen Zeng
中科院分区：
文献类型：
--
作者：
Lin Fu;Fengxia Xu;Qingwen Zeng
用激光扫描共聚焦显微镜(LSCM)和光学显微镜(LM)研究了木兰科雌雄异株植物北欧木兰(Woonengia Septenrionalis(Dandy)Law(Dandy)Law)的胚胎学特征和胚珠被发育。胚胎学特征与以往研究的木兰科植物基本一致。花药有4个小孢子囊，花药壁发育为双子叶类型。小孢子母细胞减数分裂时的胞质分裂遵循改良的同步型，形成等边或交叉的四分体，没有细胞板，但观察到膜。成熟的花粉粒为2细胞，萌发率高。胚珠倒生，厚珠心，双珠被，减数分裂形成线形四分体的大孢子，合点端的大孢子直接起胚囊细胞的作用。胚囊发育为何首乌类型，胚乳形成为核型。胚珠的外珠被分化为外肉质层和内石质层，而内珠被退化为含单宁层。正常的胚胎发育、较高的花粉萌发率和较高的结实率表明，物种衰退的主要原因不是在这些发育过程中找到的。
The embryological characteristics and ovular integument development of the dioecious species Woonyoungia septentrionalis (Dandy) Law (Magnoliaceae), which are poorly understood, were investigated under laser scanning confocal microscope (LSCM) and light microscope (LM). The embryological characteristics conform to most of the previously studied species in Magnoliaceae. The anther has 4 microsporangia, and the anther wall develops according to the dicotyledonous type. Cytokinesis at meiosis of the microspore mother cells follows a modified simultaneous type, giving rise to isobilateral or decussate tetrads, and a cell plate is absent, but a membrane was observed. Mature pollen grains are 2-cellular and have high germination rates. The ovule is anatropous, crassinucellate and bitegmic, and meiotic result in linear tetrads of megaspores, the one at the chalazal end functions directly as an embryo-sac cell. The development of the embryo sac is of the Polygonum-type and endosperm formation is of the nuclear type. The outer integument of the ovule differentiates into an outer fleshy and an inner stony layer while the inner integument is reduced to a tanniniferous layer. The normal embryological development, high germination rates of pollen and high seed set indicate that the primary reason for the decline of the species is not to be found in these developmental processes.
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影响因子：
2.4
作者：
A. Igersheim;P. K. Endress
通讯作者：
A. Igersheim;P. K. Endress
影响因子：
--
作者：
T. T. Earle-T.
通讯作者：
T. T. Earle-T.
影响因子：
3
作者：
Kim, S;Park, CW;Suh, Y
通讯作者：
Suh, Y
DOI：
10.15281/jplantres1887.51.539
发表时间：
1937
期刊：
--
影响因子：
--
作者：
K. Yasui
通讯作者：
K. Yasui
影响因子：
1.9
作者：
Fengxia Xu;Bruce Kirchoff
通讯作者：
Fengxia Xu;Bruce Kirchoff