/ Plants contain many heterotrophic tissue systems that are dependent upon sugar and amino acid import for normal growth and development. Indeed, BUSH every cell of the higher plant is at least transiently heterotrophic during early stages of differentiation. In general, oxidized forms of carbon and nitrogen are reductively assimilated in the photosynthetic tissues of the plant, and sucrose and amino acids are subsequently transported to the heterotrophic cells. The impact of these import-dependent tissues on the overall economy of the plant is considerable. For example, as much as nonphotosynthetic cells 80% of the carbon assimilated during photosynthesis is exported from the leaf to satisfy the metabolic needs of the (64). A central feature of this resource-partitioning (13, 40, 133). Thus, sugar transporters are step is phloem loading, and in many plants this process is dependent upon the function of an active sucrose carrier important contributors in both the systemic distribution of photoassimilate, as well as in the nutritional well being of the individual cell. Additional physioÂ logical processes in which sugar and amino acid transport are essential activiÂ ties include: seed filling, germination and seedling growth, filling and mobiliÂ zation in specialized storage organs, and secretion by
Annual Review of Plant Biology – Annual Reviews
Published: Jun 1, 1993
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