CIPK15-mediated inhibition of NH₄⁺ transport protects Arabidopsis from submergence.

ABSTRACT: Ammonium (NH₄⁺) serves as a vital nitrogen source for plants, but it can turn toxic when it accumulates in excessive amounts. Toxicity is aggravated under hypoxic/anaerobic conditions, e.g., during flooding or submergence, due to a lower assimilation capacity. AMT1; 1 mediates NH₄⁺ uptake into roots. Under conditions of oxygen-deficiency, i.e., submergence, the CBL-interacting protein kinase OsCIPK15 has been shown to trigger SnRK1A signaling, promoting starch mobilization, thereby the increasing availability of ATP, reduction equivalents and acceptors for NH₄⁺ assimilation in rice. Our previous study in Arabidopsis demonstrates that AtCIPK15 phosphorylates AMT1; 1 whose activity is under allosteric feedback control by phosp

SUBMITTER: Chen YN 

PROVIDER: S-EPMC10560025 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature