Sodium and chloride distribution in roots and transport in three poplar genotypes under increasing NaCl stress

Chen, Shao Liang; Li, Jie; Fritz, Eberhard; Wang, Shasheng; Hüttermann, Aloys

doi:10.1016/s0378-1127(01)00743-5

Cited by 141 publications

(149 citation statements)

References 18 publications

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“…2b). HKT1 transporters have a key role in limiting Na þ transport from roots to shoots in Arabidopsis 19 , and may account for the lower rate of ion uptake and transport recorded in P. euphratica 9,20,21 . The gene family encoding P-type H þ -ATPases also had more copies in the P. euphratica genome than in the P. trichocarpa genome (Fig.…”

Section: Resultsmentioning

confidence: 99%

Genomic insights into salt adaptation in a desert poplar

et al. 2013

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Despite the high economic and ecological importance of forests, our knowledge of the genomic evolution of trees under salt stress remains very limited. Here we report the genome sequence of the desert poplar, Populus euphratica, which exhibits high tolerance to salt stress. Its genome is very similar and collinear to that of the closely related mesophytic congener, P. trichocarpa. However, we find that several gene families likely to be involved in tolerance to salt stress contain significantly more gene copies within the P. euphratica lineage. Furthermore, genes showing evidence of positive selection are significantly enriched in functional categories related to salt stress. Some of these genes, and others within the same categories, are significantly upregulated under salt stress relative to their expression in another salt-sensitive poplar. Our results provide an important background for understanding tree adaptation to salt stress and facilitating the genetic improvement of cultivated poplars for saline soils.

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Section: Resultsmentioning

confidence: 99%

Genomic insights into salt adaptation in a desert poplar

et al. 2013

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“…In P. euphratica, an enhanced ability of the V-H + -PPase to create a H + gradient in the presence of Cl -was demonstrated. 42 In fact, results by Chen and co-workers showed that in salt stressed P. euphratica, young root cortical cells accumulated Cl -in the vacuoles when compared with control plants, 91 and Figure 2. Topological model of the Arabidopsis Na + /H + exchanger AtNHX1, showing 12 transmembrane domains, and with a hydrophobic, luminal N-terminal and a hydrophilic, cytosolic C-terminal.…”

Section: Regulation Of V-h + -Ppase and V-h + -Atpase Activity By Saltmentioning

confidence: 94%

Regulation by salt of vacuolar H⁺-ATPase and H⁺-pyrophosphatase activities and Na⁺/H⁺exchange

Silva

Gerós

2009

Plant Signaling & Behavior

165

102

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Over the last decades several efforts have been carried out to determine the mechanisms of salt homeostasis in plants and, more recently, to identify genes implicated in salt tolerance, with some plants being successfully genetically engineered to improve resistance to salt. It is well established that the efficient exclusion of Na + excess from the cytoplasm and vacuolar Na + accumulation are the most important steps towards the maintenance of ion homeostasis inside the cell. Therefore, the vacuole of plant cells plays a pivotal role in the storage of salt. After the identification of the vacuolar Na + /H + antiporter Nhx1 in Saccharomyces cerevisiae, the first plant Na + /H + antiporter, AtNHX1, was isolated from Arabidopsis and its overexpression resulted in plants exhibiting increased salt tolerance. Also, the identification of the plasma membrane Na + /H + exchanger SOS1 and how it is regulated by a protein kinase SOS2 and a calcium binding protein SOS3 were great achievements in the understanding of plant salt resistance.

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“…Similarly, we found that more Na ? and Cl -ions accumulated in the cortical walls of P. euphratica roots, as compared to the salt-sensitive poplar species (Chen et al 2002(Chen et al , 2003. It is Communicated by H. Rennenberg.…”

Section: Introductionmentioning

confidence: 97%

“…noteworthy that P. euphratica has a greater ability to sequester salt ions, especially Cl -in root cortical vacuoles (Chen et al 2002(Chen et al , 2003. The effective salt compartmentation in P. euphratica roots (including salt exclusion and vacuolar salt sequestration) is suggested to make a contribution to the restriction of ion loading into the root xylem during radial transport, and thus limits subsequent axial transport (Chen et al 2002(Chen et al , 2003.…”

Section: Introductionmentioning

confidence: 99%

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Effect of NaCl on leaf H+-ATPase and the relevance to salt tolerance in two contrasting poplar species

Deng

et al. 2010

Trees

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During a 30-day period of increasing salinity, we examined the effects of NaCl on leaf H? -ATPase and salinity tolerance in 1-year-old plants of Populus euphratica Oliv. (salt resistant) and P. popularis 35-44 (P. popularis) (salt sensitive). Electron probe X-ray microanalysis of leaf mesophyll revealed that P. euphratica had a higher ability to retain lower NaCl concentrations in the cytoplasm, as compared to P. popularis. The sustained activity of H ? pumps (by cytochemical staining) in salinised P. euphratica suggests a role in energising salt transport through the plasma membrane (PM) and tonoplast. Saltinduced alterations of leaf respiration, ATP content and expression of PM H ? -ATPase were compared between the two species. Results show that P. euphratica retained a constant respiratory rate, ATP production and protein abundance of PM H ? -ATPase (by Western blotting) in salt-stressed plants. P. euphratica was able to maintain a comparatively high capacity of ATP hydrolysis and H ? pumping during prolonged salt exposure. By contrast, the activity and expression of PM H ? -ATPase were markedly decreased in P. popularis leaves in response to salt stress. Furthermore, NaCl-stressed P. popularis plants showed a marked decline of respiration (70%) and ATP production (66%) on day 30. We conclude that the inability of P. popularis to transport salt to the apoplast and vacuole was partly due to the decreased activity of H ? pumps. As a consequence, cytosolic ion concentrations were observed to be comparatively high for an extended period of time, so that cell metabolism, in particular respiration, was disrupted in P. popularis leaves.

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Sodium and chloride distribution in roots and transport in three poplar genotypes under increasing NaCl stress

Cited by 141 publications

References 18 publications

Genomic insights into salt adaptation in a desert poplar

Genomic insights into salt adaptation in a desert poplar

Regulation by salt of vacuolar H⁺-ATPase and H⁺-pyrophosphatase activities and Na⁺/H⁺exchange

Effect of NaCl on leaf H+-ATPase and the relevance to salt tolerance in two contrasting poplar species

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Sodium and chloride distribution in roots and transport in three poplar genotypes under increasing NaCl stress

Cited by 141 publications

References 18 publications

Genomic insights into salt adaptation in a desert poplar

Genomic insights into salt adaptation in a desert poplar

Regulation by salt of vacuolar H+-ATPase and H+-pyrophosphatase activities and Na+/H+exchange

Effect of NaCl on leaf H+-ATPase and the relevance to salt tolerance in two contrasting poplar species

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Regulation by salt of vacuolar H⁺-ATPase and H⁺-pyrophosphatase activities and Na⁺/H⁺exchange