Alfalfa (Medicago sativa L.) MsCML46 gene encoding calmodulin-like protein confers tolerance to abiotic stress in tobacco
| Autor: | Changhong Guo, Binghao Du, Hongsheng Cai, Lili Song, Lin Yao, Naiyu Chen, Dan Wang, Xiu-Ting Li |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Cytoplasm
Osmotic shock Calmodulin Transgene Plant Science Biology Salt Stress Antioxidants Gene Expression Regulation Plant Stress Physiological Arabidopsis Tobacco Phylogeny Plant Proteins Abiotic component Abiotic stress Cold-Shock Response food and beverages Hydrogen Peroxide General Medicine Plants Genetically Modified biology.organism_classification Droughts Enzymes Cell biology Osmolyte biology.protein Signal transduction Agronomy and Crop Science Medicago sativa |
| Zdroj: | Plant Cell Reports. 40:1907-1922 |
| ISSN: | 1432-203X 0721-7714 |
| Popis: | MsCML46 enhances tolerance to abiotic stresses through alleviating osmotic stress and oxidative damage by regulating the expression of stress-related genes to optimize osmolytes levels and antioxidant enzyme activity in transgenic tobacco. Abiotic stresses are major environmental factors that constraint crop productivity worldwide. Various stimuli regulate intracellular calcium levels and calcium-mediated signal transduction, and cellular responses. Ca2+ signals are perceived by different Ca2+ receptors. Calmodulin-like protein (CML) is one of the best-characterized Ca2+ sensors which shares sequence similarity with highly conserved calmodulin (CaM) ubiquitously expressed in plants. Currently, the molecular and physiological functions of CMLs are largely unknown. In this study, the MsCML46 was characterized in alfalfa (Medicago sativa cv. Zhaodong) under freezing stress. Results showed that MsCML46 was localized to the cytoplasm of Arabidopsis, and its expression was strongly elevated by cold, drought, salt, saline-alkali, and ABA treatments. Overexpressing MsCML46 in tobacco enhanced tolerance to freezing, drought, and salt stresses as evidenced by improved contents of osmotic regulatory solutes and antioxidant enzyme activity but decreased reactive oxygen species (ROS) accumulation. Furthermore, cold, drought, and salt stresses increased the expression of stress-related genes in transgenic tobacco. MsCML46 binds free Ca2+ to promote signal transduction and maintain higher K+/Na+ ratio. In this way, it protects intracellular homeostasis under sodium ion toxicity. These results suggest that MsCML46 plays a crucial role in resisting abiotic stresses and can be exploited in genetic engineering for crops. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink