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首页> 外文期刊>Journal of Experimental Botany >Glucose control of root growth direction in Arabidopsis thaliana
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Glucose control of root growth direction in Arabidopsis thaliana

机译：拟南芥中根生长方向的葡萄糖控制

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摘要

Directional growth of roots is a complex process that is modulated by various environmental signals. This work shows that presence of glucose (Glc) in the medium also extensively modulated seedling root growth direction. Glc modulation of root growth direction was dramatically enhanced by simultaneous brassinosteroid (BR) application. Glc enhanced BR receptor BRASSINOSTEROID INSENSITIVE1 (BRI1) endocytosis from plasma membrane to early endosomes. Glc-induced root deviation was highly enhanced in a PP2A-defective mutant, roots curl in naphthyl phthalamic acid 1-1 (rcn1-1) suggesting that there is a role of phosphatase in Glc-induced root-growth deviation. RCN1, therefore, acted as a link between Glc and the BR-signalling pathway. Polar auxin transport worked further downstream to BR in controlling Glc-induced root deviation response. Glc also affected other root directional responses such as root waving and coiling leading to altered root architecture. High light intensity mimicked the Glc-induced changes in root architecture that were highly reduced in Glc-signalling mutants. Thus, under natural environmental conditions, changing light flux in the environment may lead to enhanced Glc production/response and is a way to manipulate root architecture for optimized development via integrating several extrinsic and intrinsic signalling cues
机译：根的定向生长是一个复杂的过程，受到各种环境信号的调节。这项工作表明培养基中葡萄糖（Glc）的存在还广泛调节了苗根的生长方向。同时油菜素类固醇（BR）的应用显着增强了根部生长方向的Glc调节。 Glc增强了BR受体BRASSINOSTEROID INSENSITIVE1（BRI1）从质膜到早期内体的胞吞作用。在PP2A缺陷型突变体中，Glc诱导的根偏向高度增强，萘基邻苯二甲酸萘酸1-1（rcn1-1）中的根卷曲，表明磷酸酶在Glc诱导的根偏向中起作用。因此，RCN1充当Glc与BR信号通路之间的链接。极性植物生长素的转运在控制Glc诱导的根系偏离反应中进一步向BR下游起作用。 Glc还影响了其他根部定向响应，例如根部挥动和卷曲，导致根部结构发生了变化。高光强度模仿了Glc诱导的根系结构变化，这种变化在Glc信号突变体中已大大降低。因此，在自然环境条件下，改变环境中的光通量可能会导致增强的Glc产生/反应，并且是通过整合多个外部和固有信号提示来操纵根系结构以实现最佳发育的方法。

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