ABA is required for differential cell wall acidification associated with root hydrotropic bending in tomato

Author:

Li Ying1,Chen Yadi2,Jiang Shuqiu1ORCID,Dai Hui3,Xu Weifeng3ORCID,Zhang Qian3,Zhang Jianhua4,Dodd Ian C.5,Yuan Wei3

Affiliation:

1. Jiangsu Key Laboratory of Crop Genomics and Physiology, Jiangsu Key Laboratory of Crop Cultivation and Physiology Jiangsu Co‐Innovation Center for Modern Production Technology of Grain Crops, College of Agriculture, Yangzhou University Yangzhou China

2. College of Horticulture and Landscape Yangzhou University Yangzhou China

3. Joint International Research Laboratory of Water and Nutrient in Crops Center for Plant Water‐Use and Nutrition Regulation and College of Resource and Environment, Fujian Agriculture and Forestry University Jinshan Fuzhou China

4. Department of Biology Hong Kong Baptist University Hong Kong China

5. The Lancaster Environment Centre Lancaster University Lancaster UK

Abstract

AbstractHydrotropism is an important adaptation of plant roots to the uneven distribution of water, with current research mainly focused on Arabidopsis thaliana. To examine hydrotropism in tomato (Solanum lycopersicum) primary roots, we used RNA sequencing to determine gene expression of root tips (apical 5 mm) on dry and wet sides of hydrostimulated roots grown on agar plates. Hydrostimulation enhances cell division and expansion on the dry side compared with the wet side of the root tip. In hydrostimulated roots, the abscisic acid (ABA) biosynthesis gene ABA4 was induced more on the dry than the wet side of root tips. The ABA biosynthesis inhibitor Fluridone and the ABA‐deficient mutant notabilis (not) significantly decreased hydrotropic curvature. Wild‐type, but not the ABA biosynthesis mutant not, root tips showed asymmetric H+ efflux, with greater efflux on the dry than on the wet side of root tips. Thus, ABA mediates asymmetric H+ efflux, allowing the root to bend towards the wet side to take up more water.

Funder

Natural Science Foundation of Jiangsu Province

National Natural Science Foundation of China

Publisher

Wiley

Subject

Plant Science,Physiology

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