KAI2 regulates seedling development by mediating light-induced remodelling of auxin transport.

KAI2 regulates seedling development by mediating light-induced remodelling of auxin transport.
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KAI2通过介导光诱导的生长素运输重塑来调节幼苗发育。

DOI:
10.1111/nph.18110
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发表时间:
2022-07
期刊:
影响因子:
9.4
通讯作者:
Bennett, Tom
Bennett, Tom
中科院分区:
生物学1区
文献类型:
--
作者:
Hamon-Josse, Maxime;Villaecija-Aguilar, Jose Antonio;Ljung, Karin;Leyser, Ottoline;Gutjahr, Caroline;Bennett, Tom

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幼苗生长的光形态重建是植物生活史中一个重要的发育转变过程。α/β-水解酶信号蛋白KARRIKIN-INSENSITIVE 2(KAI 2)是独脚金内酯受体DWARF 14(D14)的密切同源物,参与了这一过程,但目前尚不清楚KAI 2对发育的影响是如何介导的。在这里,使用生理学,药理学,遗传学和成像方法在拟南芥(Heynh.)我们表明KAI 2表型的出现是因为不能下调生长素从幼苗茎尖向根系的运输,而不是不能对光本身作出反应。我们证明,KAI 2控制光诱导的幼苗中PIN介导的生长素运输系统的重塑,促进较老组织中PIN 7丰度的减少,以及根分生组织中PIN 1/PIN 2丰度的增加。我们表明,从Kai 2突变体中去除PIN 3,PIN 4和PIN 7,或药理学抑制生长素的运输和合成,足以抑制大多数Kai 2幼苗表型。我们的结论是,KAI 2调节幼苗形态建成的生长素运输系统的影响。我们认为KAI 2不是光介导的PIN基因表达变化所必需的,但却是细胞内PIN蛋白丰度适当变化所必需的。
Photomorphogenic remodelling of seedling growth is a key developmental transition in the plant life cycle. The α/β‐hydrolase signalling protein KARRIKIN‐INSENSITIVE2 (KAI2), a close homologue of the strigolactone receptor DWARF14 (D14), is involved in this process, but it is unclear how the effects of KAI2 on development are mediated. Here, using a combination of physiological, pharmacological, genetic and imaging approaches in Arabidopsis thaliana (Heynh.) we show that kai2 phenotypes arise because of a failure to downregulate auxin transport from the seedling shoot apex towards the root system, rather than a failure to respond to light per se. We demonstrate that KAI2 controls the light‐induced remodelling of the PIN‐mediated auxin transport system in seedlings, promoting a reduction in PIN7 abundance in older tissues, and an increase of PIN1/PIN2 abundance in the root meristem. We show that removing PIN3, PIN4 and PIN7 from kai2 mutants, or pharmacological inhibition of auxin transport and synthesis, is sufficient to suppress most kai2 seedling phenotypes. We conclude that KAI2 regulates seedling morphogenesis by its effects on the auxin transport system. We propose that KAI2 is not required for the light‐mediated changes in PIN gene expression but is required for the appropriate changes in PIN protein abundance within cells.
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