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      The biochemical and molecular basis for photosynthetic acclimation to elevated atmospheric CO2

      , , ,
      Plant, Cell and Environment
      Wiley-Blackwell

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          MORE EFFICIENT PLANTS: A Consequence of Rising Atmospheric CO2?

          The primary effect of the response of plants to rising atmospheric CO2 (Ca) is to increase resource use efficiency. Elevated Ca reduces stomatal conductance and transpiration and improves water use efficiency, and at the same time it stimulates higher rates of photosynthesis and increases light-use efficiency. Acclimation of photosynthesis during long-term exposure to elevated Ca reduces key enzymes of the photosynthetic carbon reduction cycle, and this increases nutrient use efficiency. Improved soil-water balance, increased carbon uptake in the shade, greater carbon to nitrogen ratio, and reduced nutrient quality for insect and animal grazers are all possibilities that have been observed in field studies of the effects of elevated Ca. These effects have major consequences for agriculture and native ecosystems in a world of rising atmospheric Ca and climate change.
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            CARBOHYDRATE-MODULATED GENE EXPRESSION IN PLANTS.

            K E Koch (1996)
            Plant gene responses to changing carbohydrate status can vary markedly. Some genes are induced, some are repressed, and others are minimally affected. As in microorganisms, sugar-sensitive plant genes are part of an ancient system of cellular adjustment to critical nutrient availability. However, in multicellular plants, sugar-regulated expression also provides a mechanism for control of resource distribution among tissues and organs. Carbohydrate depletion upregulates genes for photosynthesis, remobilization, and export, while decreasing mRNAs for storage and utilization. Abundant sugar levels exert opposite effects through a combination of gene repression and induction. Long-term changes in metabolic activity, resource partitioning, and plant form result. Sensitivity of carbohydrate-responsive gene expression to environmental and developmental signals further enhances its potential to aid acclimation. The review addresses the above from molecular to whole-plant levels and considers emerging models for sensing and transducing carbohydrate signals to responsive genes.
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              The interaction between elevated carbon dioxide and nitrogen nutrition: the physiological and molecular background

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                Author and article information

                Journal
                PLCEDV
                Plant, Cell and Environment
                Plant Cell Environ
                Wiley-Blackwell
                0140-7791
                1365-3040
                June 1999
                June 1999
                : 22
                : 6
                : 567-582
                Article
                10.1046/j.1365-3040.1999.00432.x
                58b7ef92-2846-4b69-b67f-35e340e36189
                © 1999

                http://doi.wiley.com/10.1002/tdm_license_1.1

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