Composite Transport Model and Water and Solute Transport across Plant Roots: An Update
The present review examines recent experimental findings in root transport phenomena in terms of the composite transport model (CTM). It has been a well-accepted conceptual model to explain the complex water and solute flows across the root that has been related to the composite anatomical structure...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2018-02-01
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| Series: | Frontiers in Plant Science |
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| Online Access: | http://journal.frontiersin.org/article/10.3389/fpls.2018.00193/full |
| _version_ | 1828809218248933376 |
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| author | Yangmin X. Kim Kosala Ranathunge Seulbi Lee Yejin Lee Deogbae Lee Jwakyung Sung |
| author_facet | Yangmin X. Kim Kosala Ranathunge Seulbi Lee Yejin Lee Deogbae Lee Jwakyung Sung |
| author_sort | Yangmin X. Kim |
| collection | DOAJ |
| description | The present review examines recent experimental findings in root transport phenomena in terms of the composite transport model (CTM). It has been a well-accepted conceptual model to explain the complex water and solute flows across the root that has been related to the composite anatomical structure. There are three parallel pathways involved in the transport of water and solutes in roots – apoplast, symplast, and transcellular paths. The role of aquaporins (AQPs), which facilitate water flows through the transcellular path, and root apoplast is examined in terms of the CTM. The contribution of the plasma membrane bound AQPs for the overall water transport in the whole plant level was varying depending on the plant species, age of roots with varying developmental stages of apoplastic barriers, and driving forces (hydrostatic vs. osmotic). Many studies have demonstrated that the apoplastic barriers, such as Casparian bands in the primary anticlinal walls and suberin lamellae in the secondary cell walls, in the endo- and exodermis are not perfect barriers and unable to completely block the transport of water and some solute transport into the stele. Recent research on water and solute transport of roots with and without exodermis triggered the importance of the extension of conventional CTM adding resistances that arrange in series (epidermis, exodermis, mid-cortex, endodermis, and pericycle). The extension of the model may answer current questions about the applicability of CTM for composite water and solute transport of roots that contain complex anatomical structures with heterogeneous cell layers. |
| first_indexed | 2024-12-12T08:52:33Z |
| format | Article |
| id | doaj.art-18760ddf425a478c80ebc7a862b66711 |
| institution | Directory Open Access Journal |
| issn | 1664-462X |
| language | English |
| last_indexed | 2024-12-12T08:52:33Z |
| publishDate | 2018-02-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Plant Science |
| spelling | doaj.art-18760ddf425a478c80ebc7a862b667112022-12-22T00:30:08ZengFrontiers Media S.A.Frontiers in Plant Science1664-462X2018-02-01910.3389/fpls.2018.00193337453Composite Transport Model and Water and Solute Transport across Plant Roots: An UpdateYangmin X. Kim0Kosala Ranathunge1Seulbi Lee2Yejin Lee3Deogbae Lee4Jwakyung Sung5Division of Soil and Fertilizer, National Institute of Agricultural Sciences, Rural Development Administration, Wanju, South KoreaSchool of Biological Sciences, The University of Western Australia, Perth, WA, AustraliaDivision of Soil and Fertilizer, National Institute of Agricultural Sciences, Rural Development Administration, Wanju, South KoreaDivision of Soil and Fertilizer, National Institute of Agricultural Sciences, Rural Development Administration, Wanju, South KoreaDivision of Soil and Fertilizer, National Institute of Agricultural Sciences, Rural Development Administration, Wanju, South KoreaDivision of Soil and Fertilizer, National Institute of Agricultural Sciences, Rural Development Administration, Wanju, South KoreaThe present review examines recent experimental findings in root transport phenomena in terms of the composite transport model (CTM). It has been a well-accepted conceptual model to explain the complex water and solute flows across the root that has been related to the composite anatomical structure. There are three parallel pathways involved in the transport of water and solutes in roots – apoplast, symplast, and transcellular paths. The role of aquaporins (AQPs), which facilitate water flows through the transcellular path, and root apoplast is examined in terms of the CTM. The contribution of the plasma membrane bound AQPs for the overall water transport in the whole plant level was varying depending on the plant species, age of roots with varying developmental stages of apoplastic barriers, and driving forces (hydrostatic vs. osmotic). Many studies have demonstrated that the apoplastic barriers, such as Casparian bands in the primary anticlinal walls and suberin lamellae in the secondary cell walls, in the endo- and exodermis are not perfect barriers and unable to completely block the transport of water and some solute transport into the stele. Recent research on water and solute transport of roots with and without exodermis triggered the importance of the extension of conventional CTM adding resistances that arrange in series (epidermis, exodermis, mid-cortex, endodermis, and pericycle). The extension of the model may answer current questions about the applicability of CTM for composite water and solute transport of roots that contain complex anatomical structures with heterogeneous cell layers.http://journal.frontiersin.org/article/10.3389/fpls.2018.00193/fullapoplastic barrieraquaporinscomposite transport modelexodermiswater and solute transport |
| spellingShingle | Yangmin X. Kim Kosala Ranathunge Seulbi Lee Yejin Lee Deogbae Lee Jwakyung Sung Composite Transport Model and Water and Solute Transport across Plant Roots: An Update Frontiers in Plant Science apoplastic barrier aquaporins composite transport model exodermis water and solute transport |
| title | Composite Transport Model and Water and Solute Transport across Plant Roots: An Update |
| title_full | Composite Transport Model and Water and Solute Transport across Plant Roots: An Update |
| title_fullStr | Composite Transport Model and Water and Solute Transport across Plant Roots: An Update |
| title_full_unstemmed | Composite Transport Model and Water and Solute Transport across Plant Roots: An Update |
| title_short | Composite Transport Model and Water and Solute Transport across Plant Roots: An Update |
| title_sort | composite transport model and water and solute transport across plant roots an update |
| topic | apoplastic barrier aquaporins composite transport model exodermis water and solute transport |
| url | http://journal.frontiersin.org/article/10.3389/fpls.2018.00193/full |
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