| Change of leaf water potential and influencing factors of spring wheat during critical water requirement periods under drought stress |
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| DOI：10.7606/j.issn.1000-7601.2021.06.27 |
| Key Words: leaf water potential drought stress environmental factor spring wheat |
| Author Name | Affiliation | | DU Haolin | Lanzhou Institute of Arid Meteorology under China Meteorological Administration, Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province, Key Laboratory of Arid Climate Change and Reducing Disaster under China Meteorological Administration, Lanzhou, Gansu 730020, China | | WANG Heling | Lanzhou Institute of Arid Meteorology under China Meteorological Administration, Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province, Key Laboratory of Arid Climate Change and Reducing Disaster under China Meteorological Administration, Lanzhou, Gansu 730020, China | | ZHANG Kai | Lanzhou Institute of Arid Meteorology under China Meteorological Administration, Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province, Key Laboratory of Arid Climate Change and Reducing Disaster under China Meteorological Administration, Lanzhou, Gansu 730020, China | | CHEN Fei | Lanzhou Institute of Arid Meteorology under China Meteorological Administration, Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province, Key Laboratory of Arid Climate Change and Reducing Disaster under China Meteorological Administration, Lanzhou, Gansu 730020, China | | WANG Runyuan | Lanzhou Institute of Arid Meteorology under China Meteorological Administration, Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province, Key Laboratory of Arid Climate Change and Reducing Disaster under China Meteorological Administration, Lanzhou, Gansu 730020, China | | SUN Xuying | Lanzhou Institute of Arid Meteorology under China Meteorological Administration, Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province, Key Laboratory of Arid Climate Change and Reducing Disaster under China Meteorological Administration, Lanzhou, Gansu 730020, China | | HUANG Pengcheng | Lanzhou Regional Climate Center, Lanzhou, Gansu 730020, China |
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| Abstract: |
| To study changing characteristics of spring wheat leaf water potential under different water stresses and its relationship with environmental factors, a water stress test was conducted on spring wheat at the jointing\|heading stage at the Dingxi Arid Meteorological and Ecological Environment Test Station in Gansu Province. The results showed that with the increase of water stress, the leaf water potential of spring wheat gradually decreased. The leaf water potential under different water stresses was jointing stage> booting stage > heading stage. The leaf water potential of spring wheat had a threshold response to the soil volumetric water content. When the soil volumetric water content was greater than 11.5%, the leaf water potential changed with the soil volumetric water content in a positive correlation, and when the soil volume water content was less than 11.5%, it changed in a negative correlation. Among many environmental factors, two factors of relative atmospheric humidity, atmospheric water potential showed good linear relationship with spring wheat leaf water potential. Path analysis indicated that the strongest factor affecting leaf water potential under mild drought treatment was relative atmospheric humidity. The relative atmospheric humidity of （51.87±0.03）% could be used as the critical threshold for changes in leaf water potential under mild drought treatment. The strongest factor influencing leaf water potential under medium and severe drought treatment was atmospheric water potential. The atmospheric water potential of -99.22±8.63 MPa could be used as the critical threshold for changes in leaf water potential under medium and severe drought treatments. This study has provided a theoretical basis for ensuring timely water supply and reducing drought risk to maintain normal growth of spring wheat. |
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