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Proc Natl Acad Sci U S A. 2004 Aug 3;101(31):11506-10. Epub 2004 Jul 22.

Nitrate assimilation in plant shoots depends on photorespiration.

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1
Department of Vegetable Crops, University of California, Davis, CA 95616, USA.

Abstract

Photorespiration, a process that diminishes net photosynthesis by approximately 25% in most plants, has been viewed as the unfavorable consequence of plants having evolved when the atmosphere contained much higher levels of carbon dioxide than it does today. Here we used two independent methods to show that exposure of Arabidopsis and wheat shoots to conditions that inhibited photorespiration also strongly inhibited nitrate assimilation. Thus, nitrate assimilation in both dicotyledonous and monocotyledonous species depends on photorespiration. This previously undescribed role for photorespiration (i) explains several responses of plants to rising carbon dioxide concentrations, including the inability of many plants to sustain rapid growth under elevated levels of carbon dioxide; and (ii) raises concerns about genetic manipulations to diminish photorespiration in crops.

PMID:
15272076
PMCID:
PMC509230
DOI:
10.1073/pnas.0404388101
[Indexed for MEDLINE]
Free PMC Article
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