Drought Stress at Jointing Stage: Effects on Physiological Characteristics and Drought Resistance of Maize Varieties

doi:10.11924/j.issn.1000-6850.casb18120011

Abstract

Abstract:

The aims are to screen drought-resistant varieties and explore drought-resistant mechanisms of maize. Six maize varieties were selected as materials, and moderate water stress was carried out at jointing stage. The malondialdehyde content, chlorophyll content, soluble protein content and strontium ammonia of the six maize varieties were analyzed under drought stress. It was found that the six maize varieties showed different physiological response mechanisms under drought stress. The malondialdehyde content and chlorophyll content of the leaves of the six maize varieties decreased significantly, and the proline content, soluble protein content, superoxide dismutase and peroxidase activities increased significantly. Under drought stress, the increase of MDA content in ‘Zhengdan 988’ and ‘Zhengdan 6386’ was relatively low, the decrease of chlorophyll content was smaller, the activity of antioxidant enzyme increased, and the content of soluble protein and proline was higher. On the contrary, ‘Zhengdan958’ showed weaker drought resistance on the physiological and biochemical level than ‘Zhengdan 6386’ and ‘Zhengdan 988’. The results showed that the drought resistance of ‘Zhengdan 988’ and ‘Zhengdan 6386’ in jointing stage was stronger than that of ‘Zhengdan958’. The results have certain significance for revealing the drought tolerance mechanism of maize, and can provide guidance and reference for screening, improving and molecular breeding of drought-tolerant germplasm in maize.

Key words: maize, variety, jointing stage, drought stress, physiological characteristics, drought resistance

CLC Number:

S513.024

Jinsheng Guo, Liru Cao, Xin Zhang, Qianjin Zhang, Xin Wei, Zhenhua Wang, Xiaomin Lu. Drought Stress at Jointing Stage: Effects on Physiological Characteristics and Drought Resistance of Maize Varieties[J]. Chinese Agricultural Science Bulletin, 2020, 36(9): 14-18.

Figures/Tables 6

References 28

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