| Effects of water-saving irrigation on some photosynthetic functions and water use efficiency in wheat |
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| DOI：10.7606/j.issn.1000-7601.2011.04.04 |
| Key Words: wheat photosynthetic rate transpiration rate water use efficiency |
| Author Name | Affiliation | | LI Shengdong | Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan 250100, China | | WANG Fahong | Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan 250100, China | | SI Jisheng | Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan 250100, China | | KONG Lingan | Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan 250100, China | | ZHANG Bin | Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan 250100, China | | FENG Bo | Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan 250100, China |
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| Abstract: |
| A field experiment for effects of water stress on photosynthetic functions was conducted in Jinan, Shandong, China (36°42′N, 117°04′E) for wheat growing seasons during 2007～2009. There were four irrigation
treatments, no irrigation (W0), one irrigation at jointing stage (W1), two irrigations at jointing and anthesis stage (W2), three irrigations at over-wintering, jointing and anthesis (W3). Each irrigation supplied water of 60 mm. The results showed that, during the period of grain filling (7 d after anthesis), the photosynthetic indexes of flag leaf including the maximum photochemical efficiency (Fv/Fm), the actual photochemical efficiency of photosystem Ⅱ (ΦPSⅡ) and the photochemical quenching coefficient (qP) were obviously higher with adding irrigation and net photosynthetic rates were significantly increased. There were linear relationship between leaf stomatal conductan
ce, intercellular CO2 concentration and transpiration rate. There were significant changes in the maximal efficiency of PSⅡ photochemistry and apparent damages in PSⅡ reaction centre, its oxidising and acceptor sides, or its antennae system for W0. This was shown by the decrease in the efficiency of excitation energy capture by open PSⅡ reaction centers and the quantum yield of PSⅡ electron transport and a significant decrease in non-photochemical quenching. However, got the highest WUE in four treatments, while the dry matter accumulation and grain yield in W3 were higher than those in other treatments. Photosynthetic rate, transpiration rate and water use efficiency were significantly correlated. |
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