mg-protoporphyrin ix signals enhance plant’s tolerance to cold stress
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2016
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Abstract
The relationship between Mg-protoporphyrin IX (Mg-Proto IX) signals and plant’s tolerance to cold stress is investigated. Arabidopsis seedlings grown for 3 weeks were pretreated with 2 mM glutamate and 2 mM MgCl2 for 48 h at room temperature to induce Mg-Proto IX accumulation. Then cold stress was performed at 4 °C for additional 72 h. Glutamate + MgCl2 pre-treatments alleviated the subsequent cold stress significantly by rising the leaf temperature through inducing Mg-Proto IX signals. The protective role of glutamate + MgCl2 treatment was greatly compromised in the mutants of Mg-Proto IX synthesis, Mg-Proto IX signaling and cyanide-resistant respiration. And the enhancement of cold-responsive gene expression was greatly compromised in the mutants of Mg-Proto IX synthesis, Mg-Proto IX signaling and ABA signaling, but not in the mutant of cyanide-resistant respiration. Cold stress promoted cyanide-resistant respiration and leaf total respiration exponentially, which could be further induced by the glutamate + MgCl2 treatment. Mg-Proto IX signals also activate antioxidant enzymes and increase non-enzymatic antioxidants (glutathione but not ascorbic acid) to maintain redox equilibrium during the cold stress.
| Reference Key |
zhang2016frontiersmg-protoporphyrin
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|---|---|
| Authors | ;Zhong-Wei Zhang;Zi-Li Wu;Ling-Yang Feng;Li-Hua Dong;An-Jun Song;Ming Yuan;Yang-Er Chen;Jian Zeng;Guang-Deng Chen;Shu Yuan |
| Journal | phytochemistry letters |
| Year | 2016 |
| DOI |
10.3389/fpls.2016.01545
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| URL | |
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