| Effects of exogenous nitric oxide on low temperature stress of maize seedlings |
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| DOI：10.7606/j.issn.1000-7601.2017.04.41 |
| Key Words: maize seedlings exogenous NO low temperature stress physiological characteristics |
| Author Name | Affiliation | | WANG Fang | Department of Agronomy, Gansu Agricultural University, Drought Environment Crop Cultivation of Key Laboratory in Gansu Province, Lanzhou, Gansu 730070, China | | LI Yong-sheng | Department of Agronomy, Gansu Agricultural University, Drought Environment Crop Cultivation of Key Laboratory in Gansu Province, Lanzhou, Gansu 730070, China | | PENG Yun-ling | Department of Agronomy, Gansu Agricultural University, Drought Environment Crop Cultivation of Key Laboratory in Gansu Province, Lanzhou, Gansu 730070, China | | WANG Han-ning | Department of Agronomy, Gansu Agricultural University, Drought Environment Crop Cultivation of Key Laboratory in Gansu Province, Lanzhou, Gansu 730070, China | | FANG Yong-feng | Department of Agronomy, Gansu Agricultural University, Drought Environment Crop Cultivation of Key Laboratory in Gansu Province, Lanzhou, Gansu 730070, China | | WANG Wei | Department of Agronomy, Gansu Agricultural University, Drought Environment Crop Cultivation of Key Laboratory in Gansu Province, Lanzhou, Gansu 730070, China |
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| Abstract: |
| This study aims to evaluate the effects of exogenous NO on low temperature stress of maize seedlings under low temperature stress by pot experiment. The results showed that low temperature significantly inhibited the growth of maize seedlings. The relative water content, chlorophyll content, soluble protein content, soluble sugar content were decreased by 46.7%, 19.19%, 22.0%, 72.3%, respectively under low temperature stress. The cell membrane permeability was increased, with the relative conductivity and malondialdehyde (MDA) content increased by 44.2% and 35.1%. The appropriate concentration of exogenous NO can alleviate the damage caused by low temperature stress, especially at the concentration of 0.10 mmol·L-1 SNP. Under this optimization treatment, MDA content and relative conductivity were decreased by 24.4% and 11.1% but the relative water content, chlorophyll content, soluble protein and soluble sugar were increased by 40.2%, 11.0%, 19.25% and 123.0%, respectively. The photosynthesis of maize seedling was effectively improved by exogenous NO under low temperature stress. Compared with the condition of without NO treatment, the net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr) were significantly increased under low temperature stress, but the CO2 concentration (Ci) was obviously declined. These results suggested that appropriate application of exogenous NO could relieve the inhibitory effect of maize seedling growth under low temperature stress. |
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