Physiological and Proteomic Changes in the Apoplast Accompany Leaf Senescence in Arabidopsis.

ABSTRACT: The apoplast, i.e. the cellular compartment external to the plasma membrane, undergoes important changes during senescence. Apoplastic fluid volume increases quite significantly in senescing leaves, thereby diluting its contents. Its pH elevates by about 0.8 units, similar to the apoplast alkalization in response to abiotic stresses. The levels of 159 proteins decrease, whereas 24 proteins increase in relative abundance in the apoplast of senescing leaves. Around half of the apoplastic proteins of non-senescent leaves contain a N-terminal signal peptide for secretion, while all the identified senescence-associated apoplastic proteins contain the signal peptide. Several of the apoplastic proteins that accumulate during senescence also accumulate in stress responses, suggesting that the apop

SUBMITTER: Borniego ML 

PROVIDER: S-EPMC6960232 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature