| Biotechnology |
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| Effects of nitrogen form on growth, CO2 assimilation, chlorophyll fluorescence, and photosynthetic electron allocation in cucumber and rice plants |
| Yan-hong Zhou, Yi-li Zhang, Xue-min Wang, Jin-xia Cui, Xiao-jian Xia, Kai Shi, Jing-quan Yu |
| Department of Horticulture, Zhejiang University, Hangzhou 310029, China; Key Laboratory of Horticultural Plants Growth, Development and Quality Improvement, Ministry of Agriculture, Hangzhou 310029, China |
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Abstract Cucumber and rice plants with varying ammonium (NH4+) sensitivities were used to examine the effects of different nitrogen (N) sources on gas exchange, chlorophyll (Chl) fluorescence quenching, and photosynthetic electron allocation. Compared to nitrate (NO3−)-grown plants, cucumber plants grown under NH4+-nutrition showed decreased plant growth, net photosynthetic rate, stomatal conductance, intercellular carbon dioxide (CO2) level, transpiration rate, maximum photochemical efficiency of photosystem II, and O2-independent alternative electron flux, and increased O2-dependent alternative electron flux. However, the N source had little effect on gas exchange, Chl a fluorescence parameters, and photosynthetic electron allocation in rice plants, except that NH4+-grown plants had a higher O2-independent alternative electron flux than NO3−-grown plants. NO3− reduction activity was rarely detected in leaves of NH4+-grown cucumber plants, but was high in NH4+-grown rice plants. These results demonstrate that significant amounts of photosynthetic electron transport were coupled to NO3− assimilation, an effect more significant in NO3−-grown plants than in NH4+-grown plants. Meanwhile, NH4+-tolerant plants exhibited a higher demand for the reduced form of nicotinamide adenine dinucleotide phosphate (NADPH) for NO3− reduction, regardless of the N form supplied, while NH4+-sensitive plants had a high water-water cycle activity when NH4+ was supplied as the sole N source.
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Received: 23 February 2010
Published: 04 February 2011
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Cite this article:
Yan-hong Zhou, Yi-li Zhang, Xue-min Wang, Jin-xia Cui, Xiao-jian Xia, Kai Shi, Jing-quan Yu. Effects of nitrogen form on growth, CO2 assimilation, chlorophyll fluorescence, and photosynthetic electron allocation in cucumber and rice plants. Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2011, 12(2): 126-134.
URL:
http://www.zjujournals.com/xueshu/zjus-b/10.1631/jzus.B1000059 OR http://www.zjujournals.com/xueshu/zjus-b/Y2011/V12/I2/126
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