Photo and hormonal control of meristem identity in the Arabidopsis flower mutants apetala2 and apetala1.
Photo and hormonal control of meristem identity in the Arabidopsis flower mutants apetala2 and apetala1.
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DOI：
10.1105/tpc.9.1.37
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发表时间：
1997-01
期刊：
影响因子：
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通讯作者：
J. Okamuro;W. Szeto;Cynthia Lotys-Prass;K. D. Jofuku
中科院分区：
文献类型：
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作者：
J. Okamuro;W. Szeto;Cynthia Lotys-Prass;K. D. Jofuku
我们分析了拟南芥突变体apetala 1（ap 1）和apetala 2（ap 2）中光敏色素和赤霉素信号转导对花分生组织身份控制的贡献。AP 1花在花分生组织特性的建立方面是部分缺陷的，并且其特征在于产生异位次生花或腋生花以及分枝。短日照也能诱导ap 2 -1花的腋花产生，并被hy 1（一种阻断光敏色素活性的突变体）抑制。由ap 2 -1产生的腋生花也被外源赤霉素和spindly（spy）抑制，spindly是一种以非依赖性方式激活基础赤霉素信号转导的突变。异位腋生花的产生和ap 1花的分枝也被spy抑制。我们的结论是赤霉素促进花分生组织的身份和开花的ap 2 -1和ap 1 -1花的性状部分是由于SPY基因的活性。
We have analyzed the contributions of phytochrome and gibberellin signal transduction to the control of flower meristem identity in the Arabidopsis mutants apetala1 (ap1) and apetala2 (ap2). ap1 flowers are partially defective for the establishment of flower meristem identity and are characterized by the production of ectopic secondary or axillary flowers and by branching. Axillary flower production is also induced in ap2-1 flowers by short-day photoperiod and is suppressed by hy1, a mutation blocking phytochrome activity. The production of axillary flower by ap2-1 is also suppressed by exogenous gibberellins and by spindly (spy), a mutation that activates basal gibberellin signal transduction in hormone-independent manner. Ectopic axillary flower production and floral branching by ap1 flowers are also suppressed by spy. We conclude that gibberellins promote flower meristem identity and that the inflorescence-like traits of ap2-1 and ap1-1 flowers are due in part to SPY gene activity.