PIF3 Is Involved in the Primary Root Growth Inhibition of Arabidopsis Induced by Nitric Oxide in the Light
PIF3 Is Involved in the Primary Root Growth Inhibition of Arabidopsis Induced by Nitric Oxide in the Light作者机构：College of Life Sciences Capital Normal University Beijing 100048 PR China Beijing Vocational College of Agriculture Beijing 102442 PR China Institute of Botany Chinese Academy of Sciences Beijing 100731 PR China
出 版 物：《Molecular Plant》 (分子植物（英文版）)
年 卷 期：2014年第7卷第4期
页 面：616-625页
核心收录：
学科分类：0710[理学-生物学] 0907[农学-林学] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0829[工学-林业工程] 09[农学] 0901[农学-作物学] 0703[理学-化学] 0902[农学-园艺学] 070301[理学-无机化学]
基 金：supported by the National Natural Science Foundation of China to S.B the Beijing Natural Science Foundation to S.B the Ministry of Science and Technology of China to Y.H
主 题：nitric oxide PIF3 PHYB RGL3 root growth inhibition.
摘 要：PHYTOCHROME INTERACTING FACTOR3 （PIF3） is an important component in the phytochrome signaling pathway and mediates plant responses to various environmental conditions. We found that PIF3 is involved in the inhibition of root growth of Arabidopsis thaliana seedlings induced by nitric oxide （NO） in light. Overexpression of PIF3 partially alleviated the inhibitory effect of NO on root growth, whereas the pif3-1 mutant displayed enhanced sensitivity to NO in terms of root growth. During phytochrome signaling, the photoreceptor PHYB mediates the degradation of PIF3. We found that the phyB-9 mutant had a similar phenotype to that of PIF3ox in terms of responsiveness to NO. Furthermore, NO treatment promoted the accumulation of PHYB, and thus reduced PIF3 content. Our results further show that the activity of PIF3 is regulated by the DELLA protein RGL3[RGA （repressor of gal-3） LIKE 3]. Therefore, we speculate that PIF3 lies downstream of PHYB and RGL3, and plays an important role in the inhibitory effect of NO on root growth of Arabidopsis seedlings in light.
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