Dehydrodiconiferyl Glucosides and the Control of Plant Cell Division

脱氢双子叶苷的几种天然异构体 DCGs可替代烟草髓、叶细胞中的细胞分裂素 生物测定部。 这些DCGs已被发现在玫瑰花， 烟草 在快速生长的冠瘤和非冠瘤中， 在转化组织中，发现微摩尔浓度的DGC 而在静止的髓组织中，它们的水平是 降低 这些结果表明，细胞分裂素可能发挥控制细胞 通过调节DCG的积累和/或可用性来控制分裂。 拟议工作的目标是：1）确定时间安排， 细胞分裂素处理后DCG蓄积的生化基础 静止组织，2）确定腺苷酸细胞分裂素是否 需要DCG积累或反之亦然，和3）启动研究 DCG的摄取和代谢。 植物激素生长素和细胞分裂素的刺激作用 细胞分裂已经被知道很多年了。 然而，机制 这些激素是如何发挥其控制作用的尚不清楚。宾斯博士 表明细胞中存在脱氢癸糖苷的证据 分裂对激素细胞分裂素的反应。如果这个链接被证明是一个 因果关系之一，它将提供第一个有意义的生理联系， 激素信号（细胞分裂素）和细胞反应（细胞分裂素）之间的联系 division）。

Several naturally occurring isomers of dehydrodiconiferyl glucosides (DCGs) can substitute for cytokinin in tobacco pith and leaf cell division bioassays. These DCGs have been found in Vinca rosea and Nicotiana tabacum. In rapidly growing crown gall tumors and non- transformed tissues the DGCs are found in micromolar concentrations whereas in quiescent pith tissues their levels are one hundred fold reduced. These results suggest that cytokinin may exert control of cell division by regulating the accumulation and/or availability of DCGs. The objectives of the proposed work are to: 1) determine the timing and biochemical basis of DCG accumulation after cytokinin treatment of quiescent tissues, 2) determine whether adenylate cytokinins are required for DCG accumulation or vice versa, and 3) initiate studies on the uptake and metabolism of DCGs. The stimulatory effects of the plant hormones auxin and cytokinin on cell division have been known for many years. However, the mechanisms by which these hormones exert their control is not known. Dr. Binns has evidence that implicates dehydrodeconiferyl glucosides in the cell division response to the hormone cytokinin. If this link proves to be a causal one it will provide the first meaningful physiological link between the hormonal signal (cytokinin) and the cellular response (cell division).