【摘要】 首次报道了番木瓜(CaricapapayaL.)雄花小孢子发生和雄配子体形成的过程.结果表明,番木瓜花花药4室,药壁5～6层,腺质绒毡层;小孢子母细胞减数分裂为同时型,四分体呈正四面体形.成熟花粉粒为二细胞型,呈圆形;小孢子发育及雄配子体形成过程中有败育现象,产生空粒花粉粒.导致花粉粒败育的主要原因是绒毡层细胞延迟解体退化,不能及时提供小孢子正常发育的营养.更多还原

【Abstract】 The microsporogenesis and development of male gametophyte of male flowers of Carica papayawere reported. The anther is tetrasporangiate, and the anther wall is composed of 5～6 layers, and tapetum is glandular.The cytokinesis of meiosis of the microspore mother cell is simultaneous. The arrangment of microspore in a tetrads is tetrahedral. Mature pollen grain is of the 2-celled type, being spherical. There is abortive phenomenon during the microsporogenesis and development of male gametophyte, with empty pollen grains appearing. The main reason of causing the abortive pollen grains is the postponement of tapetum’s disintegration and degeneration, which affects the supply of nutrition for microspore growing up in time.更多还原