金花茶Camellia chrysantha(Hu)Tuyama 小孢子囊、小孢子和雄配子体的发育  

MICROSPOROGENSIS AND DEVELOPMENT OF MALE GAMETOPHYTE OF CAMELLIA CHRYSANTHA (HU) TUYAMA

作　　者：李天庆 曹慧娟 

出　　处：《北京林业大学学报》1986年第2期30-34,W001,T001-T003,共9页Journal of Beijing Forestry University

摘　　要：详细报导了金花茶小孢子囊、小孢子和雄配子体的发育过程。幼嫩花药的横切显示花药的外侧由一层表良、一层药室内壁、 1—2层中层和一层绒毡层细胞组成;内为5—8个由孢原细胞转化成的小孢子母细胞。小孢子的发育具双子叶植物的一般特征。绒毡层腺质;小孢子四分体四面体形;花粉粒在成熟时具二细胞。 在扫描电镜下观察、花粉粒为拟三孔沟的;小孢子壁形成时开始在绒毡层内切线壁出现的球状体到花粉粒成熟时仍有一部分附着于花粉粒表面。 由小孢子母细胞到小孢子的形成过程,在不同的花药,同一花药的不同花粉囊,甚至在同一个花粉囊内都显示不同步现象。 在偏光显微镜下证实小孢子形成后细胞内开始有淀粉累积,生殖细胞形成时累积最多。到生殖细胞向营养细胞内移动时逐渐消失而转化为其它的贮藏物。 染色体数目为n=x=15,Microsporogensis and developent of male gametophyte of Camellia chrysantha (Hu) Tuyama are studied. X-setino of young anther shows it consists of 1 layer of epidermis, 1 layer of endothecium, 1-2 middle layers and l layer of tapetum, inner part are 5-8 microspore mother cells. The process of microspcrogensis are the normal type of most dicotyle-doneae. Glandular tapetum, microspore tetrad quadrilateral, matured pollen grains are 2-celled.SEM observation state that the pollen grain are tricolporoidate. The ubisch bodies which appeared on the inner tangential wall of the tapetum at the time of microspore wall formation are partially remain on the surface of matured pollen grain.The process which from microspore mother cell to microspore formtion shows unsynchronouslly between different anther, different microsporangi-um of the same anther, even different cells within a microsporangium.Polarized microscopy comfirmed that starch began to accumulate in the cytoplast soon after microspore formation, with a maximum volume at the time of generative cell and gradually disappeared/changed to other reserves when the generative cell move into the vegetative cell.

关 键 词：金花茶 小孢子囊 雄配子体 发育 花药 小孢子发生 

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