The BUD2 mutation affects plant architecture through altering cytokinin and auxin responses in Arabidopsis
The BUD2 mutation affects plant architecture through altering cytokinin and auxin responses in Arabidopsis
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DOI：
10.1038/cr.2010.51
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发表时间：
2010-05-01
期刊：
影响因子：
44.1
通讯作者：
Wang, Yonghong
中科院分区：
文献类型：
--
作者：
Cui, Xia;Ge, Chunmin;Wang, Yonghong
生长素和细胞分裂素的比例通过促进或抑制腋芽生长，在调节空中结构方面发挥着至关重要的作用。我们之前已经鉴定出一种拟南芥突变体 bud2，它表现出根和芽结构的改变，这是由于 S-腺苷甲硫氨酸脱羧酶 4 (SAMDC4) 功能丧失所致。在这项研究中，我们证明BUD2可以被生长素诱导，并且诱导依赖于生长素信号传导。 BUD2 突变导致对生长素不敏感和对细胞分裂素过敏，这一点已通过愈伤组织诱导测定得到证实。我们的研究表明，多胺可能通过影响细胞分裂素的稳态以及对生长素和细胞分裂素的敏感性来发挥调节植物结构的作用。
The ratio of auxin and cytokinin plays a crucial role in regulating aerial architecture by promoting or repressing axillary bud outgrowth. We have previously identified an Arabidopsis mutant bud2 that displays altered root and shoot architecture, which results from the loss-of-function of S-adenosylmethionine decarboxylase 4 (SAMDC4). In this study, we demonstrate that BUD2 could be induced by auxin, and the induction is dependent on auxin signaling. The mutation of BUD2 results in hyposensitivity to auxin and hypersensitivity to cytokinin, which is confirmed by callus induction assays. Our study suggests that polyamines may play their roles in regulating the plant architecture through affecting the homeostasis of cytokinins and sensitivities to auxin and cytokinin.