Source-to-sink transport of sugar and regulation by environmental factors
Top Cited Papers
Open Access
- 1 January 2013
- journal article
- Published by Frontiers Media SA in Frontiers in Plant Science
- Vol. 4, 272
- https://doi.org/10.3389/fpls.2013.00272
Abstract
Source-to-sink transport of sugar is one of the major determinants of plant growth and relies on the efficient and controlled distribution of sucrose (and some other sugars such as raffinose and polyols) across plant organs through the phloem. However, sugar transport through the phloem can be affected by many environmental factors that alter source/sink relationships. In this paper, we summarize current knowledge about the phloem transport mechanisms and review the effects of several abiotic (water and salt stress, mineral deficiency, CO2, light, temperature, air, and soil pollutants) and biotic (mutualistic and pathogenic microbes, viruses, aphids, and parasitic plants) factors. Concerning abiotic constraints, alteration of the distribution of sugar among sinks is often reported, with some sinks as roots favored in case of mineral deficiency. Many of these constraints impair the transport function of the phloem but the exact mechanisms are far from being completely known. Phloem integrity can be disrupted (e.g., by callose deposition) and under certain conditions, phloem transport is affected, earlier than photosynthesis. Photosynthesis inhibition could result from the increase in sugar concentration due to phloem transport decrease. Biotic interactions (aphids, fungi, viruses…) also affect crop plant productivity. Recent breakthroughs have identified some of the sugar transporters involved in these interactions on the host and pathogen sides. The different data are discussed in relation to the phloem transport pathways. When possible, the link with current knowledge on the pathways at the molecular level will be highlighted.Keywords
This publication has 107 references indexed in Scilit:
- Characterization of AgMaT2, a Plasma Membrane Mannitol Transporter from Celery, Expressed in Phloem Cells, Including Phloem Parenchyma CellsPlant Physiology, 2007
- Molecular sabotage of plant defense by aphid salivaProceedings of the National Academy of Sciences of the United States of America, 2007
- Differential Regulation of Sorbitol and Sucrose Loading into the Phloem of Plantago major in Response to Salt StressPlant Physiology, 2007
- Evaluation of Source Leaf Responses to Water-Deficit Stresses in Cotton Using a Novel Stress BioassayPlant Physiology, 2006
- Tocopherols Play a Crucial Role in Low-Temperature Adaptation and Phloem Loading in ArabidopsisTHE PLANT CELL ONLINE, 2006
- A Shift of Phloem Unloading from Symplasmic to Apoplasmic Pathway Is Involved in Developmental Onset of Ripening in Grape BerryPlant Physiology, 2006
- SUGAR SENSING AND SIGNALING IN PLANTS: Conserved and Novel MechanismsAnnual Review of Plant Biology, 2006
- Branch Development Controls Leaf Area Dynamics in Grapevine (Vitis vinifera) Growing in Drying SoilAnnals of Botany, 2006
- Activities of Key Enzymes in Sucrose-to-Starch Conversion in Wheat Grains Subjected to Water Deficit during Grain FillingPlant Physiology, 2004
- MORE EFFICIENT PLANTS: A Consequence of Rising Atmospheric CO2?Annual Review of Plant Physiology and Plant Molecular Biology, 1997