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- Title
Ameliorating effects of exogenous Ca<sup>2+</sup> on foxtail millet seedlings under salt stress.
- Authors
Han, Fei; Sun, Mingjie; He, Wei; Cui, Xiumin; Pan, Hong; Wang, Hui; Song, Fupeng; Lou, Yanhong; Zhuge, Yuping
- Abstract
In the present study, we investigated whether Ca2+ application alleviates salinity-induced damage in foxtail millet (Setaria italica L.). We evaluated the stress-related ion balance, physiological activity and gene expression involved in plant defences against salinity exposure. Twenty-one-day-old foxtail millet was maintained in sand culture for 7 days and subjected to one of seven treatments: half-strength modified Hoagland solution (the control), 1.0% NaCl, 1.0% NaCl + 2.5 mM Ca2+, 1.0% NaCl + 5.0 mM Ca2+, 1.0% NaCl + 7.5 mM Ca2+, 1.0% NaCl + 10.0 mM Ca2+, 1.0% NaCl + 12.5 mM Ca2+. The addition of Ca2+ significantly increased shoot and root height and weight relative to calcium absent treatment and corrected the ion imbalance by increasing Ca2+, Mg2+ and K+, and decreasing Na+ in the leaves and roots. It increased chlorophyll content and root activity and decreased the relative electrolyte leakage in the roots and leaves. Calcium application significantly upregulated superoxide dismutase and catalase, increased total protein, and decreased malondialdehyde and H2O2. Finally, the addition of Ca2+ upregulated the expression of APX , SOD and CAT. It was found that 10.0 mM Ca2+ was the optimal concentration for alleviating salt stress injury in foxtail millet. Salt stress has started threatening regional development and could continue to threaten agricultural production and food security. The mitigation mechanism of Ca2+ of foxtail millet to salt stress is not only related to the yield and the patterns of saline-alkaline land utilisation but is also related to the food security of human beings. We examined the effects of different Ca2+ concentrations on foxtail millet growth, physiology, ion balance and gene expression under salt stress induced with 1.0% w/v NaCl, and found the optimal Ca2+ concentration to improve salt tolerance. This study provides theoretical and technical support for the cultivation of foxtail millet and the utilisation of salinised land with saline-alkaline soil.
- Subjects
FOXTAIL millet; GENE expression in plants; MENTAL healing; SALT; SEEDLINGS
- Publication
Functional Plant Biology, 2019, Vol 46, Issue 5, p407
- ISSN
1445-4408
- Publication type
Article
- DOI
10.1071/FP18314