Effect of Red and Blue Spectrum on Photosynthesis Physiological Characteristics of Two Ecotypes of Leymus Chinensis
ZHOU Chan1,YANG Yun fei2*,WANG Kun3
1. School of Life Science, Liaoning University,Shenyang 110036,China 2. Institute of Grassland Science,Northeast Normal University,Changchun 130024,China 3. Institute of Grassland Science,China Agricultural University,Beijing 100094, China
Photosynthesis physiological characteristics of two ecotypes of Leymus chinensis were studied under different red and blue light excitation by LED red and blue lamp house. Photosynthesis did not carry on under red and blue light of 50 μmol·m-2·s-1. When red and blue light intensity was increased, photosynthesis rate, stoma limit value and transpiration rate of the two ecotypes of Leymus chinensis were all increased. But photosynthesis rate stopped increasing under red and blue light of 1 150 μmol·m-2·s-1 for grey green ecotype Leymus chinensis and of 907 μmol·m-2·s-1 for yellow green ecotype Leymus chinensis， which is known as light saturation. And the effect of blue light on photosynthesis became weaker than red light under higher light intensity. Increasing light intensity can promote plant photosynthesis rate in the range of low light intensity. But when light intensity reaches light saturation, photosynthesis rate does not increases but decreases. Because though light quantum numbers is increasing, the numbers of coloring mater does not change and is saturated. On the other hand, when the light intensity is of light saturation, the stoma limit value was increased and the transpiration rate was decreased in order to reduce water waste. When light intensity reaches the value that plant can bear, the plant will automatically close stoma in order to decrease transpiration and to save water. Plant balances every physiological index and makes sure that physiology damage is the least and production is the greatest. Although grey green ecotype Leymus chinensis has lower stoma limit and higher water waste, it also has higher photosynthesis rate than yellow green ecotype Leymus chinensis. And the photosynthesis capability and physiology adaptation of greygreen ecotype Leymus chinensis is greater than that of yellowgreen ecotype Leymus chinensis.
Key words：Red and blue spectrum;Light intensity;Photosynthesis rate;Transpiration rate;Stoma limit value
周婵1,杨允菲2*,王堃3. 红蓝复合光谱对两个生态型羊草光合生理特性的影响[J]. 光谱学与光谱分析, 2008, 28(07): 1441-1444.
ZHOU Chan1,YANG Yun fei2*,WANG Kun3. Effect of Red and Blue Spectrum on Photosynthesis Physiological Characteristics of Two Ecotypes of Leymus Chinensis. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(07): 1441-1444.
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