| Relationship between flag leaves photosynthesis and yield, water use efficiency of eight wheat varieties under deficit irrigation |
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| DOI：10.7606/j.issn.1000-7601.2020.04.31 |
| Key Words: deficit irrigation wheat flag leaf photosynthetic characteristics fluorescence parameters grain yield water use efficiency |
| Author Name | Affiliation | | TANG Xiaopei | College of Water Sciences, Beijing Normal University, Beijing 100875, China； Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, Beijing 100875, China | | YANG Li | College of Water Sciences, Beijing Normal University, Beijing 100875, China； Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, Beijing 100875, China | | FENG Dongxue | College of Water Sciences, Beijing Normal University, Beijing 100875, China； Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, Beijing 100875, China | | GAO Zhuangzhuang | College of Water Sciences, Beijing Normal University, Beijing 100875, China； Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, Beijing 100875, China | | ZHANG Wenjie | Hebei Yingbo Seeds Technology Company Limited, Xingtai, Hebei 055550, China | | LIU Haijun | College of Water Sciences, Beijing Normal University, Beijing 100875, China； Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, Beijing 100875, China |
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| Abstract: |
| Investgating photosynthetic characteristics of flag leaves for different wheat varieties and the relationship between them and yield under deficit irrigation is greatly important for exploring the drought\|resistant and water\|saving mechanism of wheat and ensuring the stable high yield production. Eight wheat varieties wildly planted in Hebei Province were selected in this study. The parameters of gas exchange and chlorophyll fluorescence of flag leaf at stages of heading, filling, and milky\|ripe under deficit irrigation were measured, and the relationship between these photosynthetic parameters and grain yield and water use efficiency were analyzed. The results showed that the net photosynthetic rate (Pn), transpiration rate (Tr), and stomatal conductance (Gs) of the 8 wheat varieties were the largest at heading stage, followed by filling stage and milky\|ripe stage. Water use efficiency at leave level (LWUE) varied greatly with the 8 wheat varieties at heading stage, with a range of 3.7~7.9 μmol·mol-1, however, it varied slightly at filling stage, which was between 5.1~7.3 μmol·mol-1. Among the 8 varieties, the LWUE of Yingbo 700 and Hannong 1412 were 1~2 μmol·mol -1 higher than that of other varieties at milky\|ripe stage. The actual photochemical efficiency ΦPSⅡ and photochemical quenching coefficient qP of the 8 wheat varieties were also the largest at heading stage, followed by filling stage and milky\|ripe stage. The maximum photochemical efficiency (Fv/Fm) at heading and filling stages was higher than 0.80, however at the milky\|ripe stage, it decreased to 0.60~0.80. Generally, the grain yield of the 8 wheat varieties was positively correlated with their corresponding Pn, Tr, and Gs at filling stage, the correlation coefficients were approximately 0.80, indicating that the higher Pn, Tr, and Gs could be the optimal indexes for high yield. Among the 8 wheat varieties, the grain yield of Lunxuan 103, Yingbo 700, and Shimai 26 were higher than 7 500 kg·hm-2, and their grain water use efficiency were approximately 2 kg·m-3. Fully considering the performances of photosynthetic characteristics, grain yield and water use efficiency, the wheat varieties of Lunxuan 103, Yingbo 700, and Shimai 26 were recommended for Hebei region under deficit irrigation. |
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