| Effects of complementary irrigation on photosynthesis and chlorophyll fluorescence characteristics in summer maize |
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| DOI：10.7606/j.issn.1000-7601.2012.06.17 |
| Key Words: summer maize complementary irrigation photosynthesis chlorophyll fluorescence yield |
| Author Name | Affiliation | | WANG Ce | College of Agronomy, Henan Agricultural University, Key Laboratory of Physiology, Ecology and Genetic Improuement of Food Crops in Henan Province, Zhengzhou, Henan 450002, China | | WANG Zhiqiang | College of Agronomy, Henan Agricultural University, Key Laboratory of Physiology, Ecology and Genetic Improuement of Food Crops in Henan Province, Zhengzhou, Henan 450002, China | | ZHANG Zhiwei | College of Agronomy, Henan Agricultural University, Key Laboratory of Physiology, Ecology and Genetic Improuement of Food Crops in Henan Province, Zhengzhou, Henan 450002, China | | LIN Tongbao | College of Agronomy, Henan Agricultural University, Key Laboratory of Physiology, Ecology and Genetic Improuement of Food Crops in Henan Province, Zhengzhou, Henan 450002, China |
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| Abstract: |
| Pool experiment was conducted to investigate the responses of photosynthetic characteristics, chlorophyll fluorescence parameters, and yield of summer maize to different supplemental irrigations using four cultivars of Zheng-dan958, Zhongke11, Xundan 20 and Xundan 22 as materials. Maize growth was inhibited following the supplemental irri-gations was reduced. Leaf area index, net photosynthetic rate(Pn), transpiration rate(Tr), stomatal conductance(Gs), intercellular CO2 concentration(Ci), chlorophyll relative content(SPAD)and photochemical quenching(qP) also decreased, while the leaf water use efficiency(LWUE) inereased with the decreasing of irrigation. The difference between normal irrigation and moderate deficit was not significant, while that between normal irrigation and severe deficit was significant. The initial fluorescent(F0), PSⅡ biggest photochemieal efficiency(FV/ Fm) and non-photochemical quenching(NPQ) showed insignificant changes. The
results indieated that the reduction in photosynthetic capacity
and light energy transfer efficiency were the main factors for the loss in yield. However, various cultivars showed different
changing amplitude, the smaller changing amplitude showed less influence by drought stress and relatively stronger drought resistance. Cultivars performance on drought resistance is Zhongke11>Zhengdan 958 and Xundan 20>Xun-dan22. Because of regional climate effects,moderate supplementary irrigation play key roles in saving water and stabiliz-ing production under seasonal drought eondition. |
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