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Lichtenthaler, H.K., Buschmann, C., Döll, M., Fietz, H.-J., Bach, T., Kozel, U., et al. (1981) Photosynthetic Activity, Chloroplast Ultrastructure, and Leaf Characteristics of High-Light and Low-Light Plants and of Sun and Shade Leaves. Photosynthesis Research, 2, 115-141.

has been cited by the following article:

  • TITLE: Photosynthetic Light Utilization Efficiency, Water Relations and Leaf Growth of C3 and CAM Tropical Orchids under Natural Conditions

    AUTHORS: Shawn Tay, Jie He, Tim Wing Yam

    KEYWORDS: Orchid, CAM, C3, Photosynthetic Light Utilization Efficiency, Water Relations and Leaf Growth

    JOURNAL NAME: American Journal of Plant Sciences, Vol.6 No.18, November 25, 2015

    ABSTRACT: Native orchid species of Singapore in their natural conditions experience stress from high irradiance, high temperatures and periods of extended low rainfall, which impact orchid plant physiology and lead to reduced growth and productivity. In this study, it was found that there was a reduction in photochemical efficiency of photosystem II (PSII) in 6 native orchid species under high light (HL) and Bulbophyllum membranaceum under low light (LL). There was chronic photoinhibition in these 6 orchid species over a period of 3 months after transplanting onto the tree trunks without watering and fertilization, especially in Coelogynes mayeriana and Bulbophyllum membranaceum under both HL and LL. This chronic photoinhibition caused by sustained period of water deficit in their natural conditions was later reversed by natural re-watering conditions from higher rainfall. These results indicate that water deficit has a greater impact on photosynthetic light utilization efficiency than excess light. The present study also showed that after natural rewatering, relative water content (RWC) of leaves and pseudobulbs generally increased. During the natural re-watering, total leaf area also gradually increased and reached maximum expansion after 7 weeks under both HL and LL, with some exceptions due to leaf abscission or decline in total leaf area, possibly a strategy for water conservation.