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| DOI：10.13522/j.cnki.ggps.20180344 |
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| Physiological Development and Yield of Winter Wheat After Rehydration Following Water Stress at Heading and Flowing Stage |
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CUI Jiaxin, NING Huifeng, SONG Ni, ZHANG Yingying, LIU Xiaofei, SHEN Xiaojun
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Key Laboratory of Crop Water Use and Regulation, Chinese Ministry of Agriculture, Farmland Irrigation Reasearch Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
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| Abstract: |
| 【Objective】 Letting a plant suffer water stress at certain stages does not necessarily lead to a fatal damage to yield and, in contrast, is a way to improve water use efficiency. The purpose of this paper is to present the results of an experimental study on the response of physiological traits and yield of winter wheat to rehydration after it suffered different degree of water deficiency at heading and flowering stage.【Method】The experiments were conducted in lysimeters with rain-shelf and the water stress was introduced during the heading and flowing stage via moderate (T1) or severe (T2) deficit irrigation, followed by a sufficient irrigation at the grain-filling stage. The control (CK) was sufficient irrigation during the heading and flowing stage with other treatments kept the same. In each treatment, we measured the physiological traits including proline mass fraction, soluble sugar mass fraction, chlorophyll mass fraction and MDA mass fraction in the flag leaf.【Result】Compared to CK, T1 increased the proline mass fraction but reduced the chlorophyll mass fraction first day after rehydration, although neither was significant. Eleven days after the rehydration, the soluble sugar mass fraction under T1 was significantly lower than that under CK, as opposed to MDA mass fraction that was insignificantly higher under water deficit irrigation than under CK. Compared to CK, water deficiency reduced the grain yield insignificantly by 4.3%. Under T2, both proline mass fraction and soluble sugar mass fraction 16 days after the rehydration were insignificantly lower than that under CK. Compared with CK, T2 reduced the grains per spike and the grain yield by 10.6% and 13.6%, respectively. Statistical analysis showed that the difference in grain number and yield per spike was significant (p<0.05) while the difference in the 1000-grain weight was not significant between CK and the treatments.【Conclusion】A moderate water stress at the heading and flowering stage coupled with a sufficient water supply in the grain filling period can effectively improve water efficiency without scarifying yield, while a severe water stress at the heading and flowering stage could cause a permanent damage to the plant thereby yield loss even followed by sufficient irrigation.【Objective】 Letting a plant suffer water stress at certain stages does not necessarily lead to a fatal damage to yield and, in contrast, is a way to improve water use efficiency. The purpose of this paper is to present the results of an experimental study on the response of physiological traits and yield of winter wheat to rehydration after it suffered different degree of water deficiency at heading and flowering stage.【Method】The experiments were conducted in lysimeters with rain-shelf and the water stress was introduced during the heading and flowing stage via moderate (T1) or severe (T2) deficit irrigation, followed by a sufficient irrigation at the grain-filling stage. The control (CK) was sufficient irrigation during the heading and flowing stage with other treatments kept the same. In each treatment, we measured the physiological traits including proline mass fraction, soluble sugar mass fraction, chlorophyll mass fraction and MDA mass fraction in the flag leaf.【Result】Compared to CK, T1 increased the proline mass fraction but reduced the chlorophyll mass fraction first day after rehydration, although neither was significant. Eleven days after the rehydration, the soluble sugar mass fraction under T1 was significantly lower than that under CK, as opposed to MDA mass fraction that was insignificantly higher under water deficit irrigation than under CK. Compared to CK, water deficiency reduced the grain yield insignificantly by 4.3%. Under T2, both proline mass fraction and soluble sugar mass fraction 16 days after the rehydration were insignificantly lower than that under CK. Compared with CK, T2 reduced the grains per spike and the grain yield by 10.6% and 13.6%, respectively. Statistical analysis showed that the difference in grain number and yield per spike was significant (p<0.05) while the difference in the 1000-grain weight was not significant between CK and the treatments.【Conclusion】A moderate water stress at the heading and flowering stage coupled with a sufficient water supply in the grain filling period can effectively improve water efficiency without scarifying yield, while a severe water stress at the heading and flowering stage could cause a permanent damage to the plant thereby yield loss even followed by sufficient irrigation. |
| Key words: winter wheat; drought stress; rehydration; physiological characteristics of flag leaves; grain yield |
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