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Start Over Author "Yamamoto, Tsuyoshi" Journal scientific reports
6 results on '"Yamamoto, Tsuyoshi"'

6. Ca 2+ -permeable mechanosensitive channels MCA1 and MCA2 mediate cold-induced cytosolic Ca 2+ increase and cold tolerance in Arabidopsis.

Author

Mori K, Renhu N, Naito M, Nakamura A, Shiba H, Yamamoto T, Suzaki T, Iida H, and Miura K

Subjects
Acclimatization, Arabidopsis genetics, Arabidopsis Proteins genetics, Cytoplasm metabolism, Membrane Proteins genetics, Trans-Activators metabolism, Transcription Factors metabolism, Arabidopsis metabolism, Arabidopsis Proteins metabolism, Calcium metabolism, Cold-Shock Response, Membrane Proteins metabolism
Abstract

Cold shock triggers an immediate rise in the cytosolic free calcium concentration ([Ca 2+ ] cyt ) in Arabidopsis thaliana and this cold-induced elevation of [Ca 2+ ] cyt is inhibited by lanthanum or EGTA. It is suggested that intracellular calcium mainly contributes to the cold-induced [Ca 2+ ] cyt response by entering into the cytosol. Two calcium-permeable mechanosensitive channels, MCA1 and MCA2 (mid1-complementing activity), have been identified in Arabidopsis. Here, we demonstrate that MCA1 and MCA2 are involved in a cold-induced increase in [Ca 2+ ] cyt . The cold-induced [Ca 2+ ] cyt increase in mca1 and mca2 mutants was markedly lower than that in wild types. The mca1 mca2 double mutant exhibited chilling and freezing sensitivity, compared to wild-type plants. Expression of At5g61820, At3g51660, and At4g15490, which are not regulated by the CBF/DREB1s transcription factor, was down-regulated in mca1 mca2. These results suggest that MCA1 and MCA2 are involved in the cold-induced elevation of [Ca 2+ ] cyt , cold tolerance, and CBF/DREB1-independent cold signaling.

Published
2018
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