| Cite this article: | 李彦彬,冯娅,边泽鹏,等.花前干旱胁迫对冬小麦生长指标的影响[J].灌溉排水学报,0,():-. |
| Li Yan-bin,Feng Ya,Bian Ze-peng,et al.花前干旱胁迫对冬小麦生长指标的影响[J].灌溉排水学报,0,():-. |
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| Effects of f Anthesis Drought and Rehydration Before Flowering on Growth Indexes of Winter Wheat |
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Li Yan-bin1, Feng Ya1, Bian Ze-peng1, Li Dao-xi1, Zhu Ya-nan2
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1.North China University of Water Resources and Electric Power;2.Changshu River Management Office
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| Abstract: |
| Due to the global climate change, the intensity, frequency and scope of influence of agricultural drought disasters are increasing．In China，the annual grain production is reduced by 100～15 billion kg，due to drought and the quality of agricultural products is reduced，which is a direct threat to the national food security. Wheat is an important food and economic crop in China and it occupies an important position in food production. Therefore，to explore how crops respond to the changes of drought environment，and improve the resistance to drought stress and adaptability to drought environment are the key scientific problems to be solved urgently.【Objective】To study the effect of drought stress on growth indexes of winter wheat.【Method】Select Zhoumai 22 as the test material, and set mild drought (soil moisture content controlled at 60% to 70% of field water holding rate) and moderate drought (soil moisture content controlled at field) during jointing and heading stages. Water holding rate of 50%~60%) and severe drought (soil water content controlled at 40%~50% of field water holding rate), comparative analysis of the change process of winter wheat root morphology, root distribution, plant height and leaf area.【Results】Compared with CK, the root length of the drought stress treatment was reduced, and the total root length of the T1, T2, T3 treatments increased with the deepening of the drought; the root characteristics of the continuous treatments were greater than that of the single-stage treatment under light and medium drought conditions , Under severe drought conditions, the characteristics of each root system were significantly reduced; but after rewatering, the root compensation and restoration ability of the jointing stage treatment was higher than the heading stage. With the increase of drought stress and time, the root system expands and grows downwards, so that the root index is transferred to the deep layer, but the total absolute amount of root system is significantly reduced. Compared with CK, the root dry mass of T9 treatment is reduced by 64.79%, and the plant height and leaf area are reduced. The inhibition increases. The jointing stage has a greater impact on plant height. Compared with CK, the plant height of T1, T2, and T3 treatments is reduced by 3.78%, 7.59%, and 16.09%; the heading stage has a greater impact on the leaf area, and the leaf area of T4, T5 and T6 treatments is compared CK decreased by 8.11%, 23.45%, 29.43%; while the plant height and leaf area after continuous drought treatment were significantly lower than each single-stage treatment; the plant height and leaf area treated by drought stress at heading stage were reduced after one week of drought stress Shows a strong compensation effect, but the jointing stage performance is relatively slow; there is no obvious compensation after continuous drought stress. 【Conclusion】In the actual production of winter wheat, continuous drought should be avoided. If water control is required before flowering, the water supply at the jointing stage should be met as much as possible, and the water control should be maintained at a light drought level during the heading stage. |
| Key words: drought and rewatering; winter wheat; root system; plant height; leaf area |
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