Temperature-dependent polar lignification of a seed coat suberin layer promoting dormancy in <i>Arabidopsis thaliana</i>.

ABSTRACT: The seed is a landmark plant adaptation where the embryo is sheltered by a protective seed coat to facilitate dispersion. In Arabidopsis, the seed coat, derived from ovular integuments, plays a critical role in maintaining dormancy, ensuring germination occurs during a favorable season. Dormancy is enhanced by cold temperatures during seed development by affecting seed coat permeability through changes in apoplastic barriers. However, their localization and composition are poorly understood. This study identifies and investigates a polar barrier in the seed coat's outer integument (oi1) cells. We present histological, biochemical, and genetic evidence showing that cold promotes polar seed coat lignification of the outer integument 1 (oi1) cells and suberization throughout the entire

SUBMITTER: Hyvarinen L 

PROVIDER: S-EPMC11831162 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature