Abstract The objectives of this research were to investigate the morphological, physiological and nutritional characteristics of lettuce plants (Lactuca sativa L. cv. Rome) under hypobaric and hypoxic conditions. Plants were grown under two levels of total pressures (101 and 30kPa) and three levels of oxygen partial pressures (21, 6 and 2kPa) for 20 days. Hypoxia (6 or 2kPa) not only significantly inhibited the growth of lettuce plants by decreasing biomass, leaf area, root/shoot ratio, water content, the contents of minerals and organic compounds (vitamin C, crude protein and crude fat), but also destroyed the ultrastructure of mitochondria and chloroplast. The activities of catalase and total superoxide dismutase, the contents of glutathione and the total antioxidant capacity significantly decreased due to hypoxia. Hypobaria (30kPa) did not markedly enhance the biomass, but it increased leaf area, root/shoot ratio and relative water content. Hypobaria also decreased the contents of total phenols, malondialdehyde and total carbohydrate and protected the ultrastructure of mitochondria and chloroplast under hypoxia. Furthermore, the activities of catalase and total superoxide dismutase, the contents of minerals and organic compounds markedly increased under hypobaria. This study demonstrates that hypobaria (30kPa) does not increase the growth of lettuce plants, but it enhances plant׳s stress resistance and nutritional quality under hypoxia.

    Highlights Lettuce plants were grown for 20 days under hypobaric and hypoxic conditions. Hypobaria did not markedly enhance the biomass of lettuce under hypoxia. Hypobaria enhanced the stress resistance of lettuce plants under hypoxia. The ultrastructure of chloroplast and mitochondrial was changed by hypoxia. The activities of catalase and total superoxide dismutase were reduced by hypoxia.


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    Titel :

    The morphology, physiology and nutritional quality of lettuce grown under hypobaria and hypoxia


    Beteiligte:
    Tang, Yongkang (Autor:in) / Gao, Feng (Autor:in) / Guo, Shuangsheng (Autor:in) / Li, Fang (Autor:in)

    Erschienen in:

    Acta Astronautica ; 112 ; 29-36


    Erscheinungsdatum :

    2015-03-04


    Format / Umfang :

    8 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch