2019 Volume 65 Issue 2 Pages 45-50
An immediate increase in the cytosolic free calcium concentration ([Ca2+]cyt) is elicited by cold shock in Arabidopsis. This cold-induced [Ca2+]cyt increase is partially mediated by two calcium-permeable mechanosensitive channels, MCA1 and MCA2 (mid1-complementing activity 1 and 2) that are localized in the plasma membrane. In the mca1 and mca2 mutants, the cold-induced [Ca2+]cyt increase was significantly reduced. Furthermore, The mca1 mca2 plants were hypersensitive to cold stress. These results suggest that MCA1 and MCA2 are involved in the cold-induced [Ca2+]cyt increase and the acquisition of tolerance to cold stress.
