【摘要】 紫斑牡丹的花药是在花芽发育的第３ 个年周期中，从雄蕊原基发育而来。花药壁按特有方式发生，主要特点是绒毡层与次生造孢细胞同源。花药由４ 个花粉囊组成，绒毡层属分泌型，中层３～４ 层，其中１～３ 层与药室内壁同步发育出纤维素壁加厚，并在花药成熟时宿存。小孢子母细胞减数分裂同时开始，但不同时结束，分裂过程高度不同步。胞质分裂为同时型，四分体中小孢子排列呈正四面体形。减数分裂前期Ⅰ通常有Ｂ－染色体和染色体桥形成。四分体中额外小孢子的形成与Ｂ－染色体直接有关，其频率为５％ ～３０％ 或更高。更多还原

【Abstract】 Anther development and microsporogenesis of Paeonia rockii CVS were originated from the primordium of stamen in the third year cycle of flower bud.Anther wall was formed in a special method due to the homology of tapetum cell and secondary sporogenous cell.Anther was tetrasporangiate with endothecium,3~4 middle layers and glandular tapetum,of which 1~3 middle layers and endothecium developed synchronically characteristic fibrous thickenings to form fibrous layers as the anther matured.Microspore mother cells in an anther started but did not end the meiosis at the same time.Cytokinesis was simultaneous and the arrangement of microspores in the tetrad was tetrahedral.B chromosome and chromosome bridge appeared generally in the prophase 1 of meiosis.Super microspore happened in the 5%~30% or more tetrads and its formation was directly concerned with B chromosome.更多还原