Electronic Resource
Palo Alto, Calif.
:
Annual Reviews
Annual Review of Plant Physiology and Plant Molecular Biology
47 (1996), S. 509-540
ISSN:
1040-2519
Source:
Annual Reviews Electronic Back Volume Collection 1932-2001ff
Topics:
Biology
Notes:
Abstract 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1146/annurev.arplant.47.1.509
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