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Mechanisms of phloem unloading: shaped by cellular pathways, their conductances and sink function
- Source :
- Current Opinion in Plant Biology. 43:8-15
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- Phloem unloading represents a series of cell-to-cell transport steps transferring phloem-mobile constituents from phloem to sink tissues/organs to fuel their development or resource storage. Our analysis focuses on unloading of two major phloem-mobile constituents, sugars and water. Their unloading can occur across phloem plasma membranes (apoplasmic unloading), through plasmodesmata interconnecting phloem and sink cells (symplasmic unloading) or predominately symplasmically with an intervening post-phloem apoplasmic step. In planta studies of phloem unloading encounter substantial technical challenges in accessing phloem within a meshwork of vascular/ground tissues. Thus, current understanding of phloem-unloading mechanisms largely has been deduced from indirect experimental measures or modelling. Here we highlight recent advances in understanding phloem unloading mechanisms and identify where important knowledge gaps remain.
- Subjects :
- 0106 biological sciences
0301 basic medicine
geography
geography.geographical_feature_category
Cell Membrane
Cellular pathways
Plasmodesmata
Water
Biological Transport
Plant Science
Plasmodesma
Phloem
Plants
Biology
01 natural sciences
Sink (geography)
03 medical and health sciences
030104 developmental biology
Water metabolism
Biophysics
Sugars
010606 plant biology & botany
Subjects
Details
- ISSN :
- 13695266
- Volume :
- 43
- Database :
- OpenAIRE
- Journal :
- Current Opinion in Plant Biology
- Accession number :
- edsair.doi.dedup.....1caee36706b43a63013d95101db56edb