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Plant and Cell Physiology Advance Access originally published online on March 18, 2008
Plant and Cell Physiology 2008 49(4):664-670; doi:10.1093/pcp/pcn041
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© The Author 2008. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Effects of Blue Light Deficiency on Acclimation of Light Energy Partitioning in PSII and CO2 Assimilation Capacity to High Irradiance in Spinach Leaves

Ryo Matsuda1,*, Keiko Ohashi-Kaneko, Kazuhiro Fujiwara and Kenji Kurata

Department of Biological and Environmental Engineering, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657 Japan

*Corresponding author: E-mail, matsuda{at}email.arizona.edu; Fax, +1-520-626-1700.


  Abstract

Blue light effects on the acclimation of energy partitioning characteristics in PSII and CO2 assimilation capacity in spinach to high growth irradiance were investigated. Plants were grown hydroponically in different light treatments that were a combination of two light qualities and two irradiances, i.e. white light and blue-deficient light at photosynthetic photon flux densities (PPFDs) of 100 and 500 µmol m–2 s–1. The CO2 assimilation rate, the quantum efficiency of PSII ({Phi}PSII) and thermal dissipation activity Formula / Formula in young, fully expanded leaves were measured under 1,600 µmol m–2 s–1 white light. The CO2 assimilation rate and {Phi}PSII were higher, while Formula / Formula was lower in plants grown under high irradiance than in plants grown under low irradiance. These responses were observed irrespective of the presence or absence of blue light during growth. The extent of the increase in the CO2 assimilation rate and {Phi}PSII and the decrease in Formula / Formula by high growth irradiance was smaller under blue light-deficient conditions. These results indicate that blue light helps to boost the acclimation responses of energy partitioning in PSII and CO2 assimilation to high irradiance. Similarly, leaf N, Cyt f and Chl contents per unit leaf area increased by high growth irradiance, and the extent of the increment in leaf N, Cyt f and Chl was smaller under blue light-deficient conditions. Regression analysis showed that the differences in energy partitioning in PSII and CO2 assimilation between plants grown under high white light and high blue-deficient light were closely related to the difference in leaf N.

Keywords: Chlorophyll fluorescence — Gas exchange (photosynthesis) — Light acclimation — Light quality — Nitrogen (leaf) — Spinach (Spinacia oleracea L.)

Abbreviations: CRY, cryptochrome; LHCII, light-harvesting Chl-binding protein of PSII; PFD, photon flux density; PHOT, phototropin; PPFD, photosynthetic photon flux density; {Phi}PSII, quantum efficiency of PSII; Rubisco, ribulose-1,5-bisphosphate carboxylase/oxygenase; SPD, spectral photon flux density distribution.

1 Present address: Department of Plant Sciences, The University of Arizona, 303 Forbes Building, Tucson, AZ 85721-0036, USA.

(Received February 6, 2008; Accepted March 4, 2008)
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