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烤烟 NC89植株的顶端在烟苗移栽后35天已不再产生新的叶原基,进入生殖生长阶段。营养茎端的纵切面呈半圆形,原套、原体结构很明显。在向生殖生长的转变过程中,营养茎端逐渐变平,最后原套、原体结构消失,成为生殖茎端。接着生殖茎端进行纵向伸长,成为长圆锥形,同时在其周围自下而上不断分化出花序分枝原基和花原基。花原基突出后为球形,顶端变平后便进行花各部分的分化。花各部分的分化顺序基本上是由外向内的,然而花瓣原基和雄蕊原基几乎同时发生。
The top of flue-cured tobacco NC89 plants no longer produced new leaf primordium 35 days after transplanting tobacco seedlings and entered the stage of reproductive growth. Nutrition stem end of the longitudinal section was semicircular, the original set, the original body structure is obvious. In the process of transformation to reproductive growth, nutritional stalks gradually flatten, and finally the original set, the original structure disappeared, becoming reproductive stem. Then reproductive stem ends of the longitudinal elongation, as a long conical, while constantly differentiate from its bottom up around the inflorescence branch primordium and flower base. Flower primordia after the ball is prominent, the top of the flower flattening after the various parts of the differentiation. The order of differentiation of floral parts is basically from the outside to the inside, however, the petal primordial and stamen primordium occur almost simultaneously.