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Chinese Journal of Space Science ›› 2015, Vol. 35 ›› Issue (4): 473-485.doi: 10.11728/cjss2015.04.473

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Effect of LED on Plant Growth and Development in Space Culture Chamber Simulator

ZHANG Yue, PAN Jing, SUN Weining, ZHENG Huiqiong   

  1. Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032
  • Received:2014-07-26 Revised:2015-03-09 Online:2015-06-15 Published:2015-06-30

Abstract:

The goal of this study is to analyze the influence of LED light on the growth and development of plant in the plant culture chamber simulator for space experiment. The daylight fluorescence lamp was used as control to investigate the advantages and disadvantages of using LED in the plant cultivation, to provide reference data for the experiments of plant culture on board Chinese space lab TG-2 or space station in the near future. This paper focused on the influence of different LED conditions, e.g. spectra component, light intensity, light period and air exchange, on the growth of Arabidopsis thaliana and rice at different developmental stages. The results indicated that higher ratio of red to blue light could induce early flowering and early senescence in Arabidopsis and rice, respectively. The optimum ratio of red to blue light for the growth of Arabidopsis and rice is around 3.9. When the ratio is higher than 16, the growth of both Arabidopsis and rice was suppressed and leaf senescence was induced. In closed container, increased light intensity up to 150μmol·m-2·s-1 could partially release Arabidopsis growth inhibition caused by limited air exchange. When light intensity is higher than 150μmol·m-2·s-1, the growth and development of Arabidopsis were severely inhibited. For rice, the tolerance to high light was higher than Arabidopsis under limited air exchange conditions. Thus, the red to blue ligh ratios, light intensity and limited air exchange in microgravity environment should be considered when LED is used as light source in space plant culture chamber.

Key words: Plant culture in space, Arabidopsis thaliana, Rice, LED, Red/blue light, Microgravity

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