A dirigent family protein confers variation of Casparian strip thickness and salt tolerance in maize.

ABSTRACT: Plant salt-stress response involves complex physiological processes. Previous studies have shown that some factors promote salt tolerance only under high transpiring condition, thus mediating transpiration-dependent salt tolerance (TDST). However, the mechanism underlying crop TDST remains largely unknown. Here, we report that ZmSTL1 (Salt-Tolerant Locus 1) confers natural variation of TDST in maize. ZmSTL1 encodes a dirigent protein (termed ZmESBL) localized to the Casparian strip (CS) domain. Mutants lacking ZmESBL display impaired lignin deposition at endodermal CS domain which leads to a defective CS barrier. Under salt condition, mutation of ZmESBL increases the apoplastic transport of Na⁺ across the endodermis, and then increases the root-to-shoot delivery of Na⁺

SUBMITTER: Wang Y 

PROVIDER: S-EPMC9038930 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature