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  • Title: [Selection of light source used for plant cultivation in controlled ecological life support system].
    Author: Guo SS, Ai WD, Zhao CJ, Wang JX.
    Journal: Space Med Med Eng (Beijing); 2003; 16 Suppl():490-3. PubMed ID: 14989303.
    Abstract:
    OBJECTIVE: To select suitable light source for higher plant cultivation in the controlled ecological life support system of the future space station. METHOD: The experiment was carried out in the Space Higher Plant Cultivation Ground-based Experimental Facility (SHPCGEF); four combinations of two red and blue light-emitting diode (LED) were utilized as light sources; soilless cultivation technique with porous ceramic tubes and porous ceramic particles was utilized in the growth system. RESULT: The plants grown under the shelf of pure red LED showed a lying-down state in early stage, and stood erect in later period with slender and long stems; the plants under various combinations of red and blue LED grew with nearly normal state, but the plants under the combination of 90% red and 10% blue LED possessed the best comprehensive indexes. CONCLUSION: The normal growth and development of plantlets needs two light sources of red and blue LED, and the combination of 90% red and 10% blue LED is the optimum one among those tested combinations.
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