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- Thomas D Sharkey
- Department of Botany, University of Wisconsin, Madison, Wisconsin 53706;,
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- Sansun Yeh
- Department of Botany, University of Wisconsin, Madison, Wisconsin 53706;,
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<jats:p> ▪ Abstract Very large amounts of isoprene are emitted from vegetation, especially from mosses, ferns, and trees. This hydrocarbon flux to the atmosphere, roughly equal to the flux of methane, has a large effect on the oxidizing potential of the atmosphere. Isoprene emission results from de novo synthesis by the deoxyxylulose phosphate/methyl erythritol 4-phosphate pathway in plastids. Dimethylallyl pyrophosphate made by this pathway is converted to isoprene by isoprene synthase. Isoprene synthase activity in plants has a high pH optimum and requirement for Mg<jats:sup>2+</jats:sup> that is consistent with its location inside chloroplasts. Isoprene emission costs the plant significant amounts of carbon, ATP, and reducing power. Researchers hypothesize that plants benefit from isoprene emission because it helps photosynthesis recover from short high-temperature episodes. The evolution of isoprene emission may have been important in allowing plants to survive the rapid temperature changes that can occur in air because of the very low heat capacity of isoprene relative to water. </jats:p>
収録刊行物
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- Annual Review of Plant Physiology and Plant Molecular Biology
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Annual Review of Plant Physiology and Plant Molecular Biology 52 (1), 407-436, 2001-06
Annual Reviews
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詳細情報 詳細情報について
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- CRID
- 1363388843615037184
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- NII論文ID
- 30022123269
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- ISSN
- 10402519
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- データソース種別
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