Recovery of the cortical chloroplast layer in the green alga <i>Chara</i> after local irradiation.

ABSTRACT: The cytoplasm of characean internodal cells is characterized by a stationary layer of cortical chloroplast files and a mobile endoplasm moving along subcortical actin bundles. Occasionally, chloroplasts detach from the cortex and are passively carried along with the endoplasmic flow. Previous studies revealed that local irradiation with intense light causes chloroplast bleaching followed by a release into the endoplasm ("window formation"). We found that endoplasmic chloroplasts of Chara australis resettle at the window and align parallel to the streaming direction. The process takes several weeks with neither chloroplast division nor growth of proplastids being involved. Both release and re-attachment are actin-dependent. Resettled chloroplasts showed slightly, but significantly lo

SUBMITTER: Hoepflinger MC 

PROVIDER: S-EPMC12086157 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature