THE RELATIONSHIP BETWEEN CYTOKININS AND THE DIFFERFNTIATION OF FLOWER BUDS IN ON YEAR AND VEGETATIVE BUDS IN OFF YEAR TREES OF LITCHI (LITCHI CHINENSIS SONN. CV. NO MI CHI)
用气相色谱法证明糯米糍荔枝(Litchi chinensis Sonn.cv.No Mi Chi)在花芽分化期间枝条顶芽的提取液中含有玉米素。紫外线吸收光谱法显示在这种提取液中除玉米素以外还有其它细胞分裂素类物质的存在。 通过对荔枝顶芽提取液中细胞分裂素作定量生物鉴定,了解到大年,小年结实的荔枝树的顶端发育芽,在花芽形态分化期间细胞分裂素的含量有明显的差异。大年树枝梢顶端的花芽,在花芽分化临界期以后细胞分裂素的含量逐渐增加,在花器官开始分化期达到最高峰,到雌蕊分化期又下降到低于原来的低水平。而小年树的营养芽在其整个发育过程中,细胞分裂素的含量保持在一个稳定的最低水平。 施用外源细胞分裂素和生长延缓刑B_9能抑制园锥花序的伸长,增加花序分枝及增加果穗的座果率。细胞分裂素不但能促进荔枝的花芽分化,而且还影响花芽的发育。在荔枝花芽分化和发育期间,使用外源细胞分裂素及具相似生理功能物质在促进生产上将具有相当的价值。
【英文摘要】
The present research demonstrated by gas chromatography that there was zcatin in the extract of Litchi (Litchi chinensis Sonn. CV.NO MT CHI) shoottips during flower differentiation perod.In addition to zeatin other cytokinins were found in the extract by the method of ultraviolet absorption spectra.Through quantitative cytokinins bioassay in the extract solution of litchi developing buds, it was found that the contents of endogenous cytokinins during the on year were definitely different from those during t...
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