Role of silicon in enhancing resistance to freezing stress in two contrasting winter wheat cultivars

• Published in: Environmental and experimental botany Vol. 64; no. 3; pp. 286 - 294
• Main Authors: Liang, Yongchao, Zhu, Jia, Li, Zhaojun, Chu, Guixin, Ding, Yanfang, Zhang, Jie, Sun, Wanchun
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.12.2008; Oxford; New York, NY: Elsevier Science; Elsevier
• Subjects: antioxidant activity; Biological and medical sciences; cold stress; cold tolerance; cultivars; dry matter accumulation; enzyme activity; Freezing stress; frost resistance; Fundamental and applied biological sciences. Psychology; genetic variation; hydrogen peroxide; leaves; lipid peroxidation; Lipid peroxidiation; Oxidative stress; plant-water relations; proline; shoots; Silicon; Triticum aestivum; water content; Wheat; winter wheat; Oxidative stress; Silicon; Lipid peroxidiation; Freezing stress; Wheat; Monocotyledones; Plant ecology; Lipids; Cereal crop; Freezing; Gramineae; Winter crops; Angiospermae; Botany; Spermatophyta; Triticum aestivum; Low temperature; Cultivar; Frost resistance
• ISSN: 0098-8472; 1873-7307
• DOI: 10.1016/j.envexpbot.2008.06.005

The main objective of this study was to elucidate the roles of silicon (Si) in enhancing tolerance to freezing stress (−5 °C) in two contrasting wheat ( Triticum aestivum L.) cultivars: i.e. cv. Yangmai No. 5, a freezing-susceptible cultivar and cv. Linmai No. 2, a freezing-tolerant cultivar. Shoot dry weight of the freezing-susceptible wheat was significantly lower under freezing stress than in controls, but increased significantly with Si amendment. The freezing treatment did not affect shoot dry weight of the freezing-tolerant cultivar. The leaf water content was considerably decreased by freezing stress in the freezing-susceptible cultivar, but was significantly increased by Si amendment. In contrast, freezing treatment did not significantly reduce leaf water content in the freezing-tolerant cultivar and Si played no role in water retention in this cultivar. The concentrations of H 2O 2 and free proline along with malondialdehyde (MDA) were progressively enhanced by freezing stress in the two wheat cultivars used, but were significantly suppressed by amendment with Si. The major antioxidant enzyme activities and non-enzymatic antioxidants (i.e. glutathione and ascorbic acid) in the leaves of freezing-stressed plants were decreased, but were stimulated significantly by the exogenous Si. The possible mechanisms for Si-enhanced freezing stress may be attributed to the higher antioxidant defense activity and lower lipid peroxidation through water retention in leaf tissues.