The polar-localized borate exporter BOR1 facilitates boron transport in tapetal cells to the developing pollen grains.

ABSTRACT: Boron is an essential micronutrient required for plant cell wall integrity, as it is necessary for crosslinking the pectic polysaccharide rhamnogalacturonan II. Reproductive organs require a greater amount of boron for development and growth compared with vegetative organs. However, the mechanism by which plants distribute boron to specific organs is not fully understood. Under boron-limited conditions, the borate exporter BOR1 plays a central role in transporting boron from the roots to the shoots in Arabidopsis (Arabidopsis thaliana). Here, we found that BOR1 is expressed in the tapetal cells of young anthers in unopened buds, showing polar localization toward the locule where microspores develop. Tapetum-localized BOR1 undergoes endocytosis and is subsequently degraded during anther dev

SUBMITTER: Muro K 

PROVIDER: S-EPMC11953027 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature