Journal
SCIENTIFIC REPORTS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-017-17483-y
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Funding
- Plant Transgenic Design Initiative, Gene Research Center, University of Tsukuba
- Ministry of Education, Culture, Sports, Science AMP
- Technology of Japan [JP16K07390, 23120509, 25120708, JP16H01458]
- Grants-in-Aid for Scientific Research [26291026] Funding Source: KAKEN
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Cold shock triggers an immediate rise in the cytosolic free calcium concentration ([Ca2+](cyt)) in Arabidopsis thaliana and this cold-induced elevation of [Ca2+](cyt) is inhibited by lanthanum or EGTA. It is suggested that intracellular calcium mainly contributes to the cold-induced [Ca2+](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 [Ca2+](cyt) . The cold-induced [Ca2+](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 [Ca2+](cyt) cold tolerance, and CBF/DREB1-independent cold signaling.
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