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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (3): 765-771    DOI: 10.7522/j.issn.1000-694X.2013.00110
Biology and Soil     
Effects of Different LED Light Qualities on the Photosynthetic Parameters, Water Utilization Efficiency and Chloroplast Ultrastructure of Cucumber Seedling
CAO Gang, ZHANG Fan, REN Jing, MA Yan-xia, ZHANG Guo-bin, YU Ji-hua
College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China
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Abstract  

By using LED modulated light qualities accurately, We observed the effects of red, blue, red and blue mixed light generated by LED on the photosynthetic parameters and water utilization efficiency as well as chloroplast ultrastructure of cucumber seedlings with white ligh as control. It showed that the different light qualities had significant influence on the plant photosynthetic parameters, the growth and development of cucumber seedlings. The net photosynthetic rates under the circumstances of blue light and red+blue mixed light were generally higher than those in other treatments. Net photosynthetic rate under blue light was obviously the highest in value at the 10th day among all treatments, which was 27.29% higher than with that in white light, and the highest net photosynthetic rate at the 20th day was obtained in 8R/2B treatment, which was 56.94% higher than in white light. Furthermore, it showed that red and blue mixed light sources seem to keep photosynthetic rates at very high level at both 10th and 20th day, and to promote water utilization efficiency significantly. However, the red light effect on photosynthetic rates were not significant different at 0.05 level even if photosynthetic rates and water utilization efficiency at the 20th day decreased remarkably compared with the 10th day. It was observed by transmission electronic microscope that light qualities had remarkable influences on the chloroplast development of cucumber seedlings. The chloroplast under the white light seemed to be difficult to maturate, while red light was probable to hinder the photosynthates transport by the over-accumulation of starch in the chloroplast. Both grana lamella and stroma lamella of chloroplast appeared to well-developed under the 8R/2B and 7R/3B treatments, and the assimilation products were also well-exported in these two treatments.

Key words:  LED      cucumber seedlings      photosynthetic parameters      water utilization efficiency      chloroplast ultrastructure     
Received:  05 February 2013      Published:  03 March 2013
ZTFLH:  S154.1  

Cite this article: 

CAO Gang, ZHANG Fan, REN Jing, MA Yan-xia, ZHANG Guo-bin, YU Ji-hua. Effects of Different LED Light Qualities on the Photosynthetic Parameters, Water Utilization Efficiency and Chloroplast Ultrastructure of Cucumber Seedling. JOURNAL OF DESERT RESEARCH, 2013, 33(3): 765-771.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00110     OR     http://www.desert.ac.cn/EN/Y2013/V33/I3/765

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