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Plant and Cell Physiology Advance Access published online on March 18, 2008
Plant and Cell Physiology, 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 e-mail: journals.permissions@oxfordjournals.org

Effects of Blue Light Deficiency on Acclimation of Light Energy Partitioning in Photosystem II and CO2 Assimilation Capacity for 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: Dr. Ryo Matsuda, Dr. Chieri Kubota's lab, 303 Forbes Building, Department of Plant Sciences, The University of Arizona, Tucson, AZ 85721-0036, USA. Phone: +1-520-626-3288, Fax: +1-520-626-1700, E-mail: matsuda{at}email.arizona.edu


  Abstract

Blue-light effects on the acclimation of energy partitioning characteristics in PSII and CO2 assimilation capacity in spinach for 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 PPFDs of 100 and 500 µmol m-2 s-1. CO2 assimilation rate, the quantum efficiency of PSII ({Phi}PSII) and thermal dissipation activity (Fv/Fm - Fv'/Fm’) in young, fully expanded leaves were measured under 1,600 µmol m-2 s-1 white light. CO2 assimilation rate and {Phi}PSII were higher while Fv/Fm - Fv'/Fm' 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 CO2 assimilation rate and {Phi}PSII and the decrease in Fv/Fm - Fv'/Fm' 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 were 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.)

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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