| Cite this article: | 邱新强.冬小麦叶片气体交换参数对水分胁迫的响应[J].灌溉排水学报,0,():-. |
| qiuxinqiang.冬小麦叶片气体交换参数对水分胁迫的响应[J].灌溉排水学报,0,():-. |
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| Response of Gas Exchange Parameters of Winter Wheat to Water Stress |
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qiuxinqiang
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henan provincial water conservancy research institute
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| Abstract: |
| 【Objective】The objective is to define the response mechanism of leaf stomatal behavior under water stress and its relationship with yield.【Method】Through lysimeter experiments, the variation of leaf gas exchange parameters, grain yield, water consumption of winter wheat under different growth stages and water deficits were compared and analyzed.【Result】In this experiment, the total water consumption of winter wheat was reduced by drought at any growth period, and the total water consumption of severe drought treatments were always the lowest; In the two seasons, the average yield reduction and water consumption reduction of winter wheat were about 9.89% and 2.89% (light drought), 14.72% and 7.46% (medium drought), 23.62% and 21.85% (severe drought), respectively; Drought in the seedling stage had a limited effect on the gas exchange process of winter wheat leaves, and it would be more affected after jointing; The compensation growth occurred after rewatering at jointing stage, and long-term continuous drought would significantly inhibit the leaf gas exchange process of winter wheat; The stomatal limit value of winter wheat has a significant linear correlation with Gs and Tr, and its value was concentrated below 0.3; Based on the curve relationship between WUE1 and Pn, Tr and Gs, the theoretical calculated values of WUE1 under light, moderate and severe water stress were determined respectively.【Conclusion】It is beneficial to promote root growth by maintaining suitable soil water stress in the seedling stage. After jointing, severe water stress and long- term continuous drought can significantly inhibit the gas exchange process of winter wheat leaves. In production, such phenomena should be avoided as much as possible. The gas exchange parameters can be used to accurately judge water stress, and the judgement standard were given. |
| Key words: winter wheat; water stress; water use efficiency; stomatal limit; zhoumai22 |
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