The calcium transporter ANNEXIN1 mediates cold-induced calcium signaling and freezing tolerance in plants

ABSTRACT: The transient elevation of cytosolic free calcium concentration ([Ca2+]cyt) induced by cold stress is a well-established phenomenon; however, the underlying mechanism remains elusive. Here, we report that the Ca2+-permeable transporter ANNEXIN1 (AtANN1) mediates cold-triggered Ca2+ influx and freezing tolerance in Arabidopsis thaliana. The loss of function of AtANN1 substantially impaired freezing tolerance, reducing the cold-induced [Ca2+]cyt increase and upregulation of the cold-responsive CBF and COR genes. Further analysis showed that the OST1/SnRK2.6 kinase interacted with and phosphorylated AtANN1, which consequently enhanced its Ca2+ transport activity, thereby potentiating Ca2+ signaling. Consistent with these results and freezing sensitivity of ost1 mutants, the cold-induced [Ca2+

SUBMITTER: Qiangbo Liu 

PROVIDER: S-SCDT-EMBOJ-2020-104559 | biostudies-other |

REPOSITORIES: biostudies-other