Photosynthetica

, Volume 50, Issue 4, pp 623–629 | Cite as

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

Article

Abstract

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 (PG) 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 PG 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.

Additional key words

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

Abbreviations

ANOVA

analysis of variance

Chl

chlorophyll

gs

stomatal conductance

LMA

leaf mass per unit area

PG

gross photosynthetic rate

PN

net photosynthetic rate

PPFD

photosynthetic photon flux density

R:FR

red:far-red ratio

ΦPSII

quantum efficiency of photosystem II

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Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  1. 1.Graduate School of Life and Environmental SciencesOsaka Prefecture UniversitySakai, OsakaJapan
  2. 2.School of Life and Environmental SciencesOsaka Prefecture UniversitySakai, OsakaJapan

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