STUNTED-PLANT-1, A GENE REQUIRED FOR EXPANSION IN RAPIDLY ELONGATING BUT NOT IN DIVIDING CELLS AND MEDIATING ROOT-GROWTH RESPONSES TO APPLIED CYTOKININ
STUNTED-PLANT-1, A GENE REQUIRED FOR EXPANSION IN RAPIDLY ELONGATING BUT NOT IN DIVIDING CELLS AND MEDIATING ROOT-GROWTH RESPONSES TO APPLIED CYTOKININ
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DOI：
10.1104/pp.107.1.233
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发表时间：
1995-01-01
期刊：
影响因子：
7.4
通讯作者：
GORST, JR
中科院分区：
文献类型：
--
作者：
BASKIN, TI;CORK, A;GORST, JR
为了了解控制的空间模式的扩展，我们研究了根生长在野生型和发育不良的植物1突变体，stp1，拟南芥。我们测量了细胞长度的轮廓，并计算了延伸率的分布。stp1的缓慢生长是由于分裂细胞数量增加失败和快速扩张区的低延伸率。然而，分裂细胞的伸长并没有受到很大的影响，并且stp 1和野生型愈伤组织以相同的速率生长。因此，快速细胞扩增在机制上不同于分裂细胞中的扩增，并且由STP 1基因促进。此外，有stp1和野生型根伸长响应脱落酸，生长素，乙烯，或赤霉酸或径向扩张响应乙烯之间没有差异，但是，stp1响应细胞分裂素远低于野生型。与此相反，两种基因型响应激素时，外植体培养，特别是，有芽再生响应细胞分裂素的基因型之间没有差异。因此，由细胞分裂素介导的对根扩展的影响，而不是由其他激素介导的影响或对其他细胞分裂素介导的反应的影响，需要STP1基因座。
To understand the control of spatial patterns of expansion, we have studied root growth in wild type and in the stunted plant 1 mutant, stp1, of Arabidopsis thaliana. We measured profiles of cell length and calculated the distribution of elongation rate. Slow growth of stp1 results both from a failure of dividing cell number to increase and from low elongation rates in the zone of rapid expansion. However, elongation of dividing cells was not greatly affected, and stp1 and wild-type callus grew at identical rates. Thus, rapid cellular expansion differs in mechanism from expansion in dividing cells and is facilitated by the STP1 gene. Additionally, there was no difference between stp1 and wild-type roots for elongation in response to abscisic acid, auxin, ethylene, or gibberellic acid or for radial expansion in response to ethylene; however, stp1 responded to cytokinin much less than wild type. In contrast, both genotypes responded comparably to hormones when explants were cultured; in particular, there was no difference between genotypes in shoot regeneration in response to cytokinin. Thus, effects on root expansion mediated by cytokinin, but not effects mediated by other hormones or effects on other cytokinin-mediated responses, require the STP1 locus.