Comparative microsporogenesis and anther development of selected species from Magnoliaceae
Comparative microsporogenesis and anther development of selected species from Magnoliaceae
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木兰科选定物种的比较小孢子发生和花药发育
DOI：
10.1111/j.1756-1051.2012.01445.x
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发表时间：
2013-06
影响因子：
0.9
通讯作者：
Chelsea Specht
中科院分区：
文献类型：
--
作者：
Fengxia Xu;Dongqin Chen;Chelsea Specht
研究了木兰科四个物种的雄蕊发育和小孢子发生，以便提供该科的额外数据。木兰、M. paenetalauma 和 Woonyoungia septentrionalis 的雄蕊基部宽而短，无形态分化。相比之下，含笑的雄蕊明显分化为花药和花丝区域。 M. moto、M. paenetalauma 和 M. crassipes 的开裂方向分别为内向、内向-拉特罗斯和拉特罗斯。维管束范围从 3 到 5 个（M. moto、M. paenetalauma）到 1 个（M. crassipes）。 M. moto 和 M. paenetalauma 中结缔组织的数量已从产孢组织的三倍减少到两倍。在 M. crassipess 中，这两个部分几乎相等。在W. septentrionalis中，花托的不同部分的开裂方向、维管束和结缔组织的大小各不相同。内皮细胞和内皮样细胞形成一个包围整个花药的环。中层细胞起源于外、内次生壁层，在小孢子间期或减数分裂期开始逐渐退化。绒毡层是分泌型的，源自内部次生壁细胞。成熟的花药壁由一层表皮、一层内壁、三至四层中间层和一层腺绒毡层组成。花药开裂前仅留一层表皮、一层内壁以及中层和绒毡层的残余物。小孢子四分体呈等边、四面体、十字形和 T 形，由改良的同步小孢子发生产生，是从所有木兰科的共同祖先进化而来的。我们的结果支持雄蕊具有非边缘孢子囊和不育组织数量超过产孢组织数量的祖先状态，以及雄蕊上可育组织和不育组织数量均衡的进化趋势。
Stamen development and microsporogenesis of four species from Magnoliaceae was investigated in order to provide additional data from this family. Stamen bases were found to be wide and short, without morphological differentiation in Magnolia moto, M. paenetalauma and Woonyoungia septentrionalis. In contrast, stamens are distinctly differentiated into anther and filament regions in Michelia crassipes. The orientation of dehiscence is introrse, introrse-latrorse and latrorse in M. moto, M. paenetalauma and M. crassipes, respectively. The vascular bundles range from three to five (M. moto, M. paenetalauma) to one (M. crassipes). The amount of the connective tissue has been reduced from three to two times of the sporogenous tissue in M. moto and M. paenetalauma. The two parts are nearly equal in M. crassipess. In W. septentrionalis, the orientation of dehiscence, the vascular bundles and the size of the connective tissue vary in different parts of the floral receptacle. The endothecium and endothecial-like cells form a ring that encloses the entire anther. The middle layer cells originate from both the outer and inner secondary parietal layers, and start to degenerate gradually at the microspore interphase stage or meiosis stage. The tapetum is of the secretory type, derived from the inner secondary parietal cells. The mature anther wall is composed of one epidermal, one endothecial, three to four middle layer(s) and one glandular tapetum. Only one epidermis, one endothecium, and the remnants of the middle layer and tapetum are left before anther dehiscence. Microspore tetrads appear as isobilateral, tetrahedral, decussate and T-shaped, produced by a modified simultaneous microsporogenesis, which have evolved from the common ancestor of all Magnoliaceae. Our results support an ancestral state with stamens with non-marginal sporangia and the amount of sterile tissue exceeding the amount of sporogenous tissue, and evolutionary trends toward equalization of the amount of fertile and sterile tissue on the stamen.
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DOI：
--
发表时间：
2007
期刊：
--
影响因子：
--
作者：
A. Cheng
通讯作者：
A. Cheng
影响因子：
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作者：
R. Howard
通讯作者：
R. Howard
影响因子：
3
作者：
Kim, S;Park, CW;Suh, Y
通讯作者：
Suh, Y
影响因子：
0.6
作者：
A. Noel
通讯作者：
A. Noel
影响因子：
3.7
作者：
Law Yuh-wu
通讯作者：
Law Yuh-wu