期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 101, 期 31, 页码 11506-11510出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0404388101
关键词
global climate change; CO2 acclimation; Arabidopsis; wheat
Photorespiration, a process that diminishes net photosynthesis by approximate to25% 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 (h) raises concerns about genetic manipulations to diminish photorespiration in crops.
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