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首页> 外文期刊>Journal of Experimental Botany >PIN2 is required for the adaptation of Arabidopsis roots to alkaline stress by modulating proton secretion
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PIN2 is required for the adaptation of Arabidopsis roots to alkaline stress by modulating proton secretion

机译：PIN2是通过调节质子分泌使拟南芥根适应碱性胁迫所必需的

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摘要

Soil alkalinity is a widespread environmental problem that limits agricultural productivity. The hypothesis that an auxin-regulated proton secretion by plasma membrane H+-ATPase plays an important role in root adaption to alkaline stress was studied. It was found that alkaline stress increased auxin transport and PIN2 (an auxin efflux transporter) abundance in the root tip of wild-type Arabidopsis plants (WT). Compared with WT roots, the pin2 mutant roots exhibited much reduced plasma membrane H+-ATPase activity, root elongation, auxin transport, and proton secretion under alkaline stress. More importantly, roots of the pks5 mutant (PKS5, a protein kinase) lacking PIN2 (a pks5/pin2 double mutant) lost the previous higher proton-secretion capacity and higher elongation rate of primary roots under alkaline stress. By using Arabidopsis natural accessions with a high proton-secretion capacity, it was found that their PIN2 transcription abundance is positively related to the elongation rate of the primary root and proton-secretion capacity under alkaline stress. Taken together, our results confirm that PIN2 is involved in the PKS5-mediated signalling cascade under alkaline-stress and suggest that PIN2 is required for the adaptation of roots to alkaline stress by modulating proton secretion in the root tip to maintain primary root elongation.
机译：土壤碱度是一个普遍的环境问题，限制了农业生产力。研究了生长素调节质膜H + -ATPase促进质子分泌在根对碱性胁迫适应中起重要作用的假说。发现碱性胁迫增加了野生型拟南芥植物（WT）根尖的生长素运输和PIN2（生长素外排转运蛋白）的丰度。与野生根相比，pin2突变根在碱性胁迫下表现出明显降低的质膜H + -ATPase活性，根伸长，生长素运输和质子分泌。更重要的是，缺少PIN2（pks5 / pin2双突变体）的pks5突变体（PKS5，一种蛋白激酶）的根在碱性胁迫下失去了以前更高的质子分泌能力和更高的初级根伸长率。通过使用具有高质子分泌能力的拟南芥天然种质，发现它们的PIN2转录丰度与碱性胁迫下初生根的伸长率和质子分泌能力呈正相关。两者合计，我们的结果证实PIN2参与碱性胁迫下PKS5介导的信号级联反应，并表明PIN2是通过调节根尖中的质子分泌以维持基本根伸长而使根适应碱性胁迫所必需的。

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  • 来源
    《Journal of Experimental Botany》 |2012年第17期|p.6105-6114|共10页
  • 作者

    Weifeng Xu12* Liguo Jia3* František Baluška4 Guochang Ding35 Weiming Shi2† Nenghui Ye1 and Jianhua Zhang1†;

  • 作者单位

    1 School of Life Sciences and State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, Hong Kong 2 State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China 3 Department of Biology, Hong Kong Baptist University, Hong Kong, China 4 Institute of Cellular and Molecular Botany, University of Bonn, Kirschellee 1, 53115 Bonn, Germany 5 College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China;

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