| Cite this article: | 苏寒,王金涛,董心亮,等.不同浓度咸水灌溉对冬小麦产量和生理生化特性的影响[J].灌溉排水学报,0,():-. |
| Su Han,Wang Jintao,Dong Xinliang,et al.不同浓度咸水灌溉对冬小麦产量和生理生化特性的影响[J].灌溉排水学报,0,():-. |
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| Effects of Different Irrigation Water Salinities on Winter Wheat Yield, Physiological and Biochemical Traits |
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Su Han, Wang Jintao, Dong Xinliang, Chen Pei, Sun Rui, Liu Xiaojing, Sun Hongyong
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Center for Agricultural Resources Research, IGDB, CAS
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| Abstract: |
| 【Objective】The purpose of the study is to explore the effects of different irrigation water salinities on winter wheat yield, growth, physiological and biochemical traits, and to determine the appropriate irrigation water salinity threshold of winter wheat. The correlation analysis was conducted to find out the important growth, physiological and biochemical indexes related to wheat yield under saline water irrigation.【Method】To research the effects of saline water irrigation on wheat yield, growth, physiological and biochemical characteristics, winter wheat (‘SM22’ and ‘XY60’) were applied as experimental materials and cultivated in the bucket pot, irrigation water salinity were 4 levels with 1 g/L(Q1), 3 g/L(Q2), 5 g/L(Q3) and 7 g/L(Q4).【Result】Results showed that under different irrigation water salinities, yield decreasing tendency of two wheat varieties were the same, but wheat yield decreasing level was different between ‘SM22’ and ‘XY60’ .Compared with irrigation water salinity of 1 g/L, yield decreasing rate of ‘SM22’ were 3.23%、24.19% and 51.61% under irrigation water salinity of 3, 5 and 7 g/L, and yield decreasing rate of ‘XY60’ were 9.88%、35.80% and 51.85% under irrigation water salinity of 3, 5 and 7 g/L. With the increase of irrigation water salinity, wheat yield traits (spike number and 1000-kernel weight), growth traits (plant height, flag leaf area, aboveground biomass and root biomass), physiological traits (stomatal conductance, transpiration rate, net photosynthesis rate and chlorophyll content (SPAD) of flag leaf during grain-filling period) and biochemical traits (leaf K+/Na+、Ca2+/Na+ and Mg2+/Na+ during grain-filling period) significantly decreased, yet leaf proline content and Na+ content significantly increased during grain-filling period. Under saline water irrigation, wheat yield was significantly and positively correlated with 1000-kernel weight and grain yield (r=0.991, P<0.001), plant height (r=0.955, P<0.01), aboveground biomass (r=0.961, P<0.01), root biomass (r=0.835, P<0.05), flag leaf chlorophyll content (SPAD) (r=0.943, P<0.01),and leaf K+/Na+ (r=0.908, P<0.05), and wheat yield was significantly and negatively correlated with leaf proline content (r=-0.838, P<0.05) and Na+ content (r=-0.861, P<0.05).【Conclusion】The yield, growth, physiological and biochemical performance (grain-filling period) of two wheat varieties were the same under different irrigation water salinities. Bucket wheat yield under 3 g/L irrigation water salinity was not significantly different from which under control, the irrigation water salinity threshold of winter wheat was 3 g/L. Under saline water irrigation, 1000-kernel weight was the most important factor affecting wheat yield among three yield components. Plant height, aboveground biomass and root biomass were the important growth traits affecting wheat yield. Flag leaf chlorophyll content (SPAD) was the main physiological trait affecting wheat yield. Leaf proline content, Na+ content and K+/Na+ were the important biochemical traits affecting wheat yield. |
| Key words: saline water irrigation; winter wheat; wheat yield; physiological and biochemical traits; irrigation water salinity threshold |
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