Changes in the Chlorophyll Contents of Leaves and in Levels of Cytokinins in Root Exudates during Ripening of Rice Cultivars Nipponbare and Akenohoshi : GROWTH AND DEVELOPMENT

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概要

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• Changes in fluxes of cyiokinins in exudates transported via the xylem from roots of rice plants cvs. Nipponbare (a standard Japanese cultivar) and Akenohoshi (a slowly senescing cultivar) were measured by mass spectrometry with deuterium-labeled standards. The fluxes of zeatin (Z), trans-ribosylzeatin (trans-RZ), N^6-isopentenyladenine (iP), and "conjugated Z" (Z in the hydrolysates of highly polar fractions) decreased from heading to the late ripening stage in both cultivars. At the late ripening stage, iP and Z could no longer be detected, while the flux of N^6-isopentenyladenosine (iPA) increased slightly. In Akenohoshi, conjugated Z was the predominant cytokinin from heading to the middle of the ripening stage. The flux of each of the cytokinins in Akenohoshi was higher than that in Nipponbare at every time point, with the exception of the flux of iPA just after heading. The total concentration of cytokinins in the xylem exudate of Akenohoshi was higher than that of Nipponbare after the middle of ripening stage. The chlorophyll content of the third leaves, which were senescing rapidly, was significantly correlated with the flux of total cytokinins per plant or per unit leaf area. These results suggest that the larger amounts of cytokinins, in particular conjugated Z, transported from the roots to the shoots caused the slow senescence of leaves in Akenohoshi during the ripening stage.

• 日本植物生理学会の論文

著者

• Soejima Hiroshi

  Laboratory Of Crop Science Faculty Of Agriculture Tokyo University:(current)snow Brand Seed Co. Ltd.

• Ishihara Kuni

  Laboratory Of Crop Science Faculty Of Agriculture Tokyo University

• Sugiyama Tamizi

  Laboratory of Bioorganic Chemistry, Faculty of Agriculture, Meiji University

• Sugiyama Tamizi

  Laboratory Of Bioorganic Chemistry Faculty Of Agriculture Meiji University

関連論文

• Changes in the Chlorophyll Contents of Leaves and in Levels of Cytokinins in Root Exudates during Ripening of Rice Cultivars Nipponbare and Akenohoshi : GROWTH AND DEVELOPMENT
• Changes in the Rate of Photosynthesis during Grain Filling and the Enzymatic Activities Associated with the Photosynthetic Carbon Metabolism in Rice Panicles
• Mass Spectrometric Determination of Cytokinins in Young Sweet-potato Plants Using Deuterium-labeled Standards
• Relationship between leaf and xylem water potential in rice plants
• Isolation and Identification of Endogenous Cytokinins from Alfalfa (Medicago saliva L.)

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