Galactan mobilization during carbon starvation compromises plant cell wall-mediated resistance to fungal infection.

ABSTRACT: Polysaccharides are the main components present in plant cell walls. They form a network that is dynamically modified during growth and upon both abiotic and biotic stress. We investigated how the cell wall of Arabidopsis rosettes is remodeled during periods of dark-induced starvation in the wild type and in plastidic phosphoglucomutase (pgm) mutants, which suffer from periodic starvation due to starch deficiency. Time-course analysis demonstrated that up to one fifth of the galactose present in leaf cell walls is reversibly released upon starvation, while other cell wall monosaccharides were less affected. An investigation of β-galactosidase (BGAL) expression and the analysis of bgal mutants indicated that BGAL1 and BGAL4 contribute to the release of cell wall galactose upon starvation. I

SUBMITTER: Reckleben L 

PROVIDER: S-EPMC12370242 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature