Arabidopsis IAR4 Modulates Primary Root Growth Under Salt Stress Through ROS-Mediated Modulation of Auxin Distribution.

ABSTRACT: High salinity is one of the major environmental stresses that plants encounter. Roots are the initial and direct organs to perceive the signal. However, how plant roots perceive and respond to salinity at the molecular and physiological levels is still poorly understood. Here, we report that IAA-CONJUGATE-RESISTANT 4 (IAR4) plays a key role in primary root growth under salt stress conditions. Mutation of IAR4 led to increased sensitivity to salt stress conditions, with strongly inhibited primary root growth and reduced survival rate in two iar4 mutant alleles. iar4 mutants accumulated greater Na⁺ and exhibited a greater Na⁺/K⁺ ratio under NaCl treatment. In addition, more reactive oxygen species (ROS) accumulated in the

SUBMITTER: Fu Y 

PROVIDER: S-EPMC6494962 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature