Photosynthetica, 2012 (vol. 50), issue 4

Photosynthetica 2012, 50(4):623-629 | DOI: 10.1007/s11099-012-0071-1

High-light-like photosynthetic responses of Cucumis sativus leaves acclimated to fluorescent illumination with a high red:far-red ratio: interaction between light quality and quantity

T. Shibuya1,*, R. Endo1, N. Hayashi2, Y. Kitaya1
1 Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka, Japan
2 School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka, Japan

This study evaluated the photosynthetic responses of Cucumis sativus leaves acclimated to illumination from three-band white fluorescent lamps with a high red:far-red (R:FR) ratio (R:FR = 10.5) and the photosynthetic responses of leaves acclimated to metal-halide lamps that provided a spectrum similar to that of natural light (R:FR = 1.2) at acclimation photosynthetic photon flux density (PPFD) of 100 to 700 μmol m-2 s-1. The maximum gross photosynthetic rate (P G) of the fluorescent-acclimated leaves was approximately 1.4 times that of the metal-halide-acclimated leaves at all acclimation PPFDs. The ratio of quantum efficiency of photosystem II (ΦPSII) of the fluorescent-acclimated leaves to that of the metal-halide-acclimated leaves tended to increase with increasing acclimation PPFD, whereas the corresponding ratios for the leaf mass per unit area tended to decrease with increasing acclimation PPFD. These results suggest that the greater maximum P G of the fluorescent-acclimated leaves resulted from an interaction between the acclimation light quality and quantity, which was mainly caused by the greater leaf biomass for photosynthesis per area at low acclimation PPFDs and by the higher ΦPSII as a result of changes in characteristics and distribution of chloroplasts, or a combination of these factors at high acclimation PPFDs.

Keywords: fluorescent lamp; gross photosynthetic rate; leaf mass per unit area; light quality; quantum efficiency of photosystem II

Received: March 11, 2012; Accepted: August 25, 2012; Published: December 1, 2012Show citation

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Shibuya, T., Endo, R., Hayashi, N., & Kitaya, Y. (2012). High-light-like photosynthetic responses of Cucumis sativus leaves acclimated to fluorescent illumination with a high red:far-red ratio: interaction between light quality and quantity. Photosynthetica, 50(4), 623-629. doi: 10.1007/s11099-012-0071-1.
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