Role of vacuolar membrane transport systems in plant salinity tolerance
Mansour, Mohamed Magdy F.;
Abstract
About 20% of all irrigated land is adversely afected by salinity hazards and therefore understanding plant defense mecha nisms against salinity will have great impact on plant productivity. In the last decades, comprehension of salinity resistance
at molecular level has been achieved through the identifcation of key genes encoding biomarker proteins underpinning
salinity tolerance. Implication of the vacuolar transport systems in plant salinity tolerance is one example of these central
mechanisms rendering tolerance to saline stress. One important organelle in plant cells is the central vacuole that plays pivotal
multiple roles in cell functioning under normal and stress conditions. This review thus attempts to address diferent lines
of evidence supporting the role of the vacuolar membrane transport systems in plant salinity tolerance. Vacuolar transport
systems include Na+(K+)/H+ antiporters, V-ATPase, V-PPase, Ca2+/H+ exchangers, Ca2+-ATPase, ion channels, aquaporins,
and ABC transporters. They contribute essentially in retaining a high cytosolic K+/Na+ ratio, K+ level, sequestrating Na+
and Cl− into vacuoles, as well as regulation of other salinity responsive pathways. However, little is known about the regula tion and functions of some of the vacuolar transporters under salinity stress and therefore need more exploration and focus.
Numerous studies demonstrated that the activities of the vacuolar transporters are upregulated in response to salinity stress,
confrming their central roles in salinity tolerance mechanism. The second line of evidence is that manipulation of one of the
genes encoding the vacuolar transport proteins results in some successful improvement of plant salinity tolerance. Therefore,
transgene pyramiding of more than one gene for developing genotypes with better and strong salinity tolerance and productiv ity should gain more attention in future research. In addition, we should move step further and verify the experimental data
obtained from either a greenhouse or controlled environment into feld trials in order to support our claims.
at molecular level has been achieved through the identifcation of key genes encoding biomarker proteins underpinning
salinity tolerance. Implication of the vacuolar transport systems in plant salinity tolerance is one example of these central
mechanisms rendering tolerance to saline stress. One important organelle in plant cells is the central vacuole that plays pivotal
multiple roles in cell functioning under normal and stress conditions. This review thus attempts to address diferent lines
of evidence supporting the role of the vacuolar membrane transport systems in plant salinity tolerance. Vacuolar transport
systems include Na+(K+)/H+ antiporters, V-ATPase, V-PPase, Ca2+/H+ exchangers, Ca2+-ATPase, ion channels, aquaporins,
and ABC transporters. They contribute essentially in retaining a high cytosolic K+/Na+ ratio, K+ level, sequestrating Na+
and Cl− into vacuoles, as well as regulation of other salinity responsive pathways. However, little is known about the regula tion and functions of some of the vacuolar transporters under salinity stress and therefore need more exploration and focus.
Numerous studies demonstrated that the activities of the vacuolar transporters are upregulated in response to salinity stress,
confrming their central roles in salinity tolerance mechanism. The second line of evidence is that manipulation of one of the
genes encoding the vacuolar transport proteins results in some successful improvement of plant salinity tolerance. Therefore,
transgene pyramiding of more than one gene for developing genotypes with better and strong salinity tolerance and productiv ity should gain more attention in future research. In addition, we should move step further and verify the experimental data
obtained from either a greenhouse or controlled environment into feld trials in order to support our claims.
Other data
Title | Role of vacuolar membrane transport systems in plant salinity tolerance | Authors | Mansour, Mohamed Magdy F. | Issue Date | Mar-2023 | Publisher | Springer Nature | Journal | Journal of Plant Growth Regulation | Volume | 42 | Issue | March | Start page | 1364 | End page | 1401 | DOI | https://doi.org/10.1007/s00344-022-10655-9 |
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