| Effects of drought on flag\|leaf photosynthetic characteristics to light and yield of wheat with different drought resistance |
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| DOI：10.7606/j.issn.1000-7601.2020.03.09 |
| Key Words: drought stress winter wheat flag leaf light\|response curve grain yield |
| Author Name | Affiliation | | HUANG Ming | School of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | | WU Jinzhi | School of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | | LI Youjun | School of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | | WANG Hezheng | School of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | | FU Guozhan | School of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | | CHEN Mingcan | School of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | | ZHANG Zhenwang | School of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China |
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| Abstract: |
| In order to investigate the differences of light\|response of winter wheat with different drought resistance under drought stress and effects on wheat yield. A pool experiment under the rain\|proof shed condition was carried out with treatments including three soil moisture and two cultivars, to measure the response curves of net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentration (Ci), transpiration rate (Tr), and instantaneous water use efficiency (IWUE) of flag leaf to light and yield traits of wheat in the 2013-2014 and 2014-2015. The two tested cultivars were Jinmai47 (JM47) with strong drought resistance and Yanzhan4110 (YZ4110) with weak drought resistance. The soil moisture treatments included persistent drought after jointing stage (W1, irrigation to 50%±5% of maximum field capacity, MFC after joining), drought after anthesis stage (W2, irrigation to 70%±5% of MFC from jointing to booting, and irrigation to 50%±5% of MFC after anthesis), and well\|irrigation after jointing stage (W3, irrigation to 75%±5% of MFC after jointing). The light\|response curves of Pn, Gs, Tr, and IWUE in the flag leaves of wheat during the early and medium grain filling stage were damping increased and even slightly decreased after reaching the peak, but that of Ci showed an opposite tendency. The differences of vigorous treatments on the light\|response curves of flag leaf Pn, Gs, and IWUE during the early grain filling stage were greater than that during the medium grain filling stage, and the differences on Gs was greater than that on Ci. Compared with W3, the light\|response curves of flag leaf Pn, Gs, Tr, and IWUE in the two tested wheat in W1 and YZ4110 in W2 were decreased, but that of Ci increased; the light\|response curves of flag leaf Pn, Gs, and IWUE in JM47 in W2 were increased during the early grain filling stage but decreased during the medium grain filling stage. Compared with W3, the apparent quantum efficiency (α), dark respiration rate (Rd), light compensation point (LCP) were increased by 22.8%，40.5% and 24.6% in W1 and 12.0%,22.2%,12.4% in W2, respectively, but the light saturation point (LSP) and maximum net photosynthetic rate (Pnmax) were decreased by 38.1%,3.0% in W1 and 13.9%,6.0% in W2, respectively. The increase amplitude of light\|response curves of Pn and Gs and the decrease amplitude of light\|response curves of Ci in JM47 were higher than that in YZ4110 under W1 and W2 treatments, and the Pnmax and LSP during the two tested growth stages and the α value and LSP during the early grain filling stage in JM47 were 26.1%,3.3% and 8.1% higher in W1 and 31.6%, 4.7% and 11.0% higher in W2 than that in YZ4110, while the Rd during the medium grain filling stage was 9.2% lower in W1 and 6.6% lower in W2, respectively. There was no significant difference in grain yield between the two tested varieties under W3, while the average yield in JM47 in W1 and W2 increased by 18.8% and 10.9%, respectively, compared with YZ4110. The correlation analysis results showed that the flag leaf Pnmax could be used as a screening index of wheat drought resistance, and improved the flag leaf Pnmax during the early grain filling stage could help to increase grain yield and optimize yield components, while improving the flag leaf Pnmax during the medium grain filling stage was more beneficial to increase grain yield. Above all, the wheat with strong drought\|resistance could increase grain yield by 8.9%~24.9% through optimizing the flag leaf photosynthetic characteristics to light under the drought stress conditions after jointing or anthesis stages. |
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