| Salt tolerance of different genotypes maize at the big flare stage |
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| DOI：10.7606/j.issn.1000-7601.2018.01.22 |
| Key Words: maize bell stage germplasm resources salt tolerance comprehensive evaluation |
| Author Name | Affiliation | | ZHANG Hui-li | Agricultural College of Ningxia University, Yinchuan, Ningxia 750021, China | | YUAN Chuang | Agricultural College of Ningxia University, Yinchuan, Ningxia 750021, China | | XU Xing | Agricultural College of Ningxia University, Yinchuan, Ningxia 750021, China
Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China of Ministry of Education, Ningxia University, Yinchuan, Ningxia 750021, China | | ZHU Lin | Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China of Ministry of Education, Ningxia University, Yinchuan, Ningxia 750021, China
State Key Laboratory Breeding Base of Land Degradation and Ecological Restoration of Northwest China, Ningxia University, Yinchuan, Ningxia 750021, China | | ZHU Zhi-ming | Agricultural College of Ningxia University, Yinchuan, Ningxia 750021, China | | GAO Xue | State Key Laboratory Breeding Base of Land Degradation and Ecological Restoration of Northwest China, Ningxia University, Yinchuan, Ningxia 750021, China |
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| Abstract: |
| In order to evaluate salt tolerance of different maize genotypes, 25 varieties/lines were planted in saline-alkali land subjected to salt stress in northern Ningxia, Yinchuan, with the soil salt contents being 2.337, 3.044 g·kg-1 and 6.935 g·kg-1). Based on phenotypes and physiological indexes measured at big flare stage, salt tolerance of the 25 maize genotypes were evaluated through principal component analysis and the subordinate function method. The results showed that plant height, stem diameter, relative chlorophyll content (SPAD values) were significantly decreased with the increase of salt stress. At mild stress (the soil salt content was 2.337 g·kg-1), there was a significant positive correlation between plant height, stem diameter and SPAD. Under severe stress (the soil salt content was 6.935 g·kg-1), there was a significant positive correlation between stem diameter, SPAD values and canopy temperature, and canopy temperature had a significantly negative correlation with superoxide dismutase (SOD). Membrane permeability and SOD were extremely significant positive correlated, and other agronomic traits and physiological indexes were not significantly correlated. According to comprehensive evaluation, the salt tolerance of maize varieties was divided into highly salt tolerant, salt tolerant, salt susceptible and highly salt susceptible. |
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