Mg2+ Transporter MGT7 Mediates Arabidopsis thaliana Adapting to High Calcium Environment
# Co-first authors
Received date: 2015-11-20
Accepted date: 2016-02-14
Online published: 2016-08-05
A high Ca environment has negative effects on plant growth and development, so the adaptation of plants to high Ca2+ level is important to study. We found that the Arabidopsis Mg2+ transporter MGT7 loss-of-function mutants mgt7-1 and mgt7-2 showed a high Ca2+-sensitive phenotype: under high Ca2+ medium, the leaf fresh weight but not root length decreased significantly compared to the wild type Col-0. The high Ca2+ content had no effect on MGT7 promoter activity and the expression of other Mg2+ transporter genes including MGT7. The mgt7 mutant and the wild type did not differ in extracellular Ca2+-induced cytosolic Ca2+ level and Ca and Mg content. However, with both normal and high Ca2+ media, the Mg content was lower in mgt7 than the wild type. High Ca2+ treatment inhibited Mg2+ accumulation in both mgt7 and the wild type. The mutant’s high Ca2+-sensitive phenotype may be due to decreased Mg content. Increasing the Mg content but not N, P, K or S in the medium fully rescued the high Ca2+-sensitive phenotype.
Chunli Ma, Mailisi HeShuote, Zhi Qi, Jing Wang, Junxia Zhang . Mg2+ Transporter MGT7 Mediates Arabidopsis thaliana Adapting to High Calcium Environment[J]. Chinese Bulletin of Botany, 2016 , 51(4) : 496 -503 . DOI: 10.11983/CBB15207
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