Growth and Sink to Source Transition in Developing Leaves of Sugarbeet

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概要

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• The growth and sink to source transition (cessation of assimilate import) in light-grown leaves were compared to those of dark-grown leaves. Darkening chambers were placed over sugarbeet (Beta vulgaris L.) plants so that new leaves emerged and grew in the dark. New leaves emerged at 1.8day intervals, regardless of the light conditions. The dark-grown leaves were reversibly retarded in overall growth; they were unable to photosynthesize, but attained photosynthetic, vein loading and export capacity after exposure to sufficient amount and duration of light. Despite the inability to fix carbon, dark-grown leaves showed dry weight gain. The increase in the dry weight, however, was localized in the petiole and major veins and not in the laminar tissue. Despite metabolic differences in the two leaf types, sink to source transition occurred in about a week in both light- and dark-grown leaves; and assimilate importing stopped at about 8 days after emergence. While sink to source transition (as determined by assimilate import) per se did not appear to be light-regulated, the ability to accumulate sucrose in the veins for export out,of leaves was light dependent. This was based on the observation that post-transitional dark-grown leaves which had ceased importing could not export exogenously applied sucrose unless they were exposed to light for several days. The data indicated that transition is developmentally regulated and not coupled to photosynthetic capacity.

• 日本植物生理学会の論文

著者

• Pitcher L

  Department Of Crop Science Lipman Hall P. O. Box 231 Cook College Rutgers University

• Pitcher Lynne

  Department Of Crop Science Lipman Hall P.o. Box 231 Cook College Rutgers University

• Pitcher Lynne

  Department Of Crop Science Lipman Hall P. O. Box 231 Cook College Rutgers University

• Daie Jaleh

  Department of Crop Science, Lipman Hall, P. O. Box 231, Cook College, Rutgers University

• Daie Jaleh

  Department Of Botany Birge Hall University Of Wisconsin

• Daie Jaleh

  Department Of Crop Science Lipman Hall P. O. Box 231 Cook College Rutgers University

関連論文

• Growth and Sink to Source Transition in Developing Leaves of Sugarbeet
• Does Apoplastic Sucrose Induce the Ability for Sucrose Loading in Developing Leaves of Sugarbeet?
• Regulation of the Cytosolic Fructose-1,6-Bisphosphatase by Post-Translational Modification and Protein Level in Drought-Stressed Leaves of Sugarbeet : GENE STRUCTURE AND EXPRESSION
• Expression Dynamics of Genes Encoding Key Carbon Matabolism Enzymes during Sink to Source Transition of Developing Leaves
• Expression of Genes Encoding Rubisco in Sugarbeet(Beta vulgaris.L)Plants Subjected to Gradual Desiccation : ENVIRONMENTAL AND STRESS RESPONSES

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