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| DOI：10.13522/j.cnki.ggps.2017.0720 |
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| Physiological Development and Water Use Efficiency of Winter Wheat After Re-watering Following Drought Stresses at Different Growth Stages |
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NI Shengli, LI Xingmao, WANG Yacui, REN Genshen
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1. Key Laboratory of Ministry of Agriculture for Northwest Crop Drought-resistant Production and Farming System/Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China; 2.Pingliang Academy of Agricultural Sciences, Pingliang 744000, China
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| Abstract: |
| 【Objective】 The purpose of this work is to experimentally study the effects of re-watering after drought stress occurring at different growth stages on growth and water use of winter wheat under different growth stages.【Method】 The experiments were conducted in pots using two varieties with different drought tolerance: Longjian 108 and Xiping 1. For each variety, water stress was imposed between greening and jointing stage, or greening and booting stage, or booting and filling stage; sufficient irrigation was used as the control. The wheat was re-watered at the end of the imposed water stress. For each treatment, we measured physiological development and ultimate yield of the crops after re-watering. 【Result】 Re-watering after a moderate drought at greening period enhanced growth, yield and water use (WUE) of the two wheats, compared to CK, especially WUE which increased to 1.224 kg/m3 for Longjian 108 and 1.033 kg/m3 for Xiping 1. Re-watering after a moderate drought at the jointing stage only slightly improved the weight of the 1000-grain and the yield of Longjian 108, compared to the CK. Under other treatments, the growth, yield factors, dry matter accumulation of the two varieties were unable to recover their levels under CK. Re-watering after severe drought in other treatments also failed to recover the growth, dry matter accumulation, yield and harvest traits. The growth, growth traits, dry matter accumulation and harvest index after re-watering following a severe drought decreased, with the severity of the drought increasing and the re-watering delaying, especially for Xiping 1. 【Conclusion】The compensative effects of re-watering after a drought stress varied with crop variety and the time that the drought stress occurred. Under the same drought and re-watering condition, the recovery of the more drought-resistant Longjian 108 was significantly quicker than the less drought-resistant Xiping 1. Under the same treatment, the harvest index and water use efficiency of Longjian 108 were also higher than that of Xiping 1. |
| Key words: winter wheat; drought; Re-watering; growth; yield; compensation effect; water use efficiency |
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