烤烟花芽分化的细胞组织学研究

Cyto-histological Study on Flower Bud Differentiation of Flue-cured Tobacco Plant

Shoot apex of flue-cured tobacco variety no longer produces new leaf primordia and comes into a period of reproductive growth 35 days after planting. The tunica, the corpus and the cyto-histological zones can be distinguished easily in a longitudinal section of vegetative apex. During the transition from vegetative to reproductive growth, the reproductive apex with mantle core is developed. It elongates and becomes inflorescence axis. At the same time some inflorescence branch primordia and a terminal flower primordium produce from lower to upper in the periphery of the axis. After an inflorescence branch primordium is shaped,first it produces a terminal flower prmordium,later a bract and continually an axillary bud primordium and an accessory bud primordium in the axill of the bract. The process mentioned above repeats many times by the axillary and accessory flower bud primordia. The floral organs appear after the apex of flower primordia becomes widdened and flattened.