TFT6 and TFT7, two different members of tomato 14-3-3 gene family, play distinct roles in plant adaption to low phosphorus stress

Plant, Cell & Environment
Wei Feng XuJianhua Zhang

Abstract

14-3-3 proteins are a large family of proteins but exact roles of their members in plant response to abiotic stresses are not clear, especially under nutrient deficiency. We investigated the expressions of all the tomato 14-3-3 gene family members (TFT1-TFT12) under low phosphorus stress (LP) and found that TFT6 belongs to the later responsive gene while TFT7 belongs to the early responsive gene. When the two genes were separately introduced into Arabidopsis and overexpressed, their plant growth under LP was much enhanced compared with wild-type plant. TFT6 overexpressing plants showed reduced starch synthase activity, reduced starch content but enhanced sucrose loading into phloem in the shoot under LP. TFT7 overexpressing plants had much enhanced H⁺ flux along their root tip and activity of plasma membrane H⁺-ATPase in the roots under LP. Our results suggest that TFT6 and TFT7 play different roles in plant adaption to LP. TFT6 acts mainly in leaves and is involved in the systemic response to LP by regulating leaf carbon allocation and increasing phloem sucrose transport to promote root growth, while TFT7 directly functions in root by activating root plasma membrane H⁺-ATPase to release more protons under LP.

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Citations

Mar 21, 2013·The Plant Cell·Gyeong Mee Yoon, Joseph J Kieber
Jul 19, 2014·Current Opinion in Plant Biology·Cuiyue LiangHong Liao
Jul 28, 2013·Journal of Proteomics·Isabel A AbreuM Margarida Oliveira
Jul 28, 2012·Plant Signaling & Behavior·Weifeng XuJianhua Zhang
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May 29, 2016·Biochemical and Biophysical Research Communications·Qing LiuBin Liu
Apr 25, 2017·Journal of Proteomics·Xin WangSetsuko Komatsu
Oct 26, 2018·The New Phytologist·Ritu ChaudharyIsgouhi Kaloshian
Dec 8, 2016·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Varsha PatharePenna Suprasanna
Feb 28, 2020·Nature Communications·Weifeng XuFeng Cheng
Jan 13, 2021·International Journal of Molecular Sciences·Shiheng LyuWenqin She
Nov 14, 2021·Plant Cell Reports·Ye HuangLiang Chen

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