Arabidopsis apoplast TET8 positively correlates to leaf senescence, and <i>tet3tet8</i> double mutants are delayed in leaf senescence.

ABSTRACT: Extracellular vesicles (EVs) are membrane-bound exosomes secreted into the apoplast. Two distinct populations of EVs have been described in Arabidopsis: PEN1-associated and TET8-associated. We previously noted early leaf senescence in the pen1 single and pen1pen3 double mutant. Both PEN1 and PEN3 are abundant in EV proteomes suggesting that EVs might regulate leaf senescence in soil-grown plants. We observed that TET8 is more abundant in the apoplast of early senescing pen1 and pen1pen3 mutant rosettes and in older wild-type (WT) rosettes. The increase in apoplast TET8 in the pen1 mutant did not correspond to increased TET8 mRNA levels. In addition, apoplast TET8 was more abundant in the early leaf senescence myb59 mutant, meaning the increa

SUBMITTER: Zimmerman JA 

PROVIDER: S-EPMC11422175 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature