环境中的硝酸盐通过根尖中的脱落酸发出信号。
Environmental nitrate signals through abscisic acid in the root tip.
作者信息
Harris Jeanne M, Ondzighi-Assoume Christine A
机构信息
a Department of Plant Biology , University of Vermont , Burlington , VT , USA.
b Department of Agricultural and Environmental Sciences , Tennessee State University , Nashville , TN , USA.
出版信息
Plant Signal Behav. 2017 Jan 2;12(1):e1273303. doi: 10.1080/15592324.2016.1273303.
Abstract
Roots respond to changes in environmental nitrate with a localized stimulation of ABA levels in the root tip. This rise in ABA levels is due to the action of ER-localized β-GLUCOSIDASE 1, which releases bioactive ABA from the inactive ABA-glucose ester. The slow rise in root tip ABA levels stimulates expression of nitrate metabolic enzymes and simultaneously activates a negative feedback loop involving the protein phosphatase, ABI2, which reduces nitrate influx via the AtNPF6.3 transceptor. The rise in root-tip localized ABA also negatively regulates expression of the SCARECROW transcription factor, thus providing a sensitive mechanism for modulating root growth in response to environmental changes.
摘要
根系通过根尖中脱落酸（ABA）水平的局部刺激来响应环境硝酸盐的变化。ABA水平的这种升高是由于内质网定位的β-葡萄糖苷酶1的作用，该酶从无活性的ABA-葡萄糖酯中释放出生物活性ABA。根尖ABA水平的缓慢升高刺激了硝酸盐代谢酶的表达，同时激活了一个涉及蛋白磷酸酶ABI2的负反馈回路，该回路通过AtNPF6.3转运体减少硝酸盐流入。根尖局部ABA的升高还负向调节 scarecrow转录因子的表达，从而提供了一种敏感机制来调节根系生长以响应环境变化。
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