Puccinellia tenuiflora maintains a low Na+ level under salinity by limiting unidirectional Na+ influx resulting in a high selectivity for K+ over Na+

Wang, Chun-Mei, Zhang, Jin-Lin, Liu, Xue-Song, Li, Zhan, Wu, Guo-Qiang, Cai, Jian-Yi, Flowers, Timothy J and Wang, Suo-Min (2009) Puccinellia tenuiflora maintains a low Na+ level under salinity by limiting unidirectional Na+ influx resulting in a high selectivity for K+ over Na+. Plant, Cell and Environment, 32 (5). pp. 486-496. ISSN 0140-7791

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Abstract

Puccinellia tenuiflora is a useful monocotyledonous halophyte that might be used for improving salt tolerance of cereals. This current work has shown that P. tenuiflora has stronger selectivity for K+ over Na+ allowing it to maintain significantly lower tissue Na+ and higher K+ concentration than that of wheat under short- or long-term NaCl treatments. To assess the relative contribution of Na+ efflux and influx to net Na+ accumulation, unidirectional 22Na+ fluxes in roots were carried out. It was firstly found that unidirectional 22Na+ influx into root of P. tenuiflora was significantly lower (by 31–37%) than in wheat under 100 and 150 mm NaCl. P. tenuiflora had lower unidirectional Na+ efflux than wheat; the ratio of efflux to influx was similar between the two species. Leaf secretion of P. tenuiflora was also estimated, and found the loss of Na+ content from leaves to account for only 0.0006% of the whole plant Na+ content over 33 d of NaCl treatments. Therefore, it is proposed that neither unidirectional Na+ efflux of roots nor salt secretion by leaves, but restricting unidirectional Na+ influx into roots with a strong selectivity for K+ over Na+ seems likely to contribute to the salt tolerance of P. tenuiflora.

Item Type: Article
Additional Information: Times Cited: 13 Wang, Chun-Mei Zhang, Jin-Lin Liu, Xue-Song Li, Zhan Wu, Guo-Qiang Cai, Jian-Yi Flowers, Timothy J. Wang, Suo-Min
Keywords: Na+secretion, selective absorption for K+ over Na+, selective transport for K+ over Na+, unidirectional 22Na+ influx and efflux
Schools and Departments: School of Life Sciences > Evolution, Behaviour and Environment
Subjects: Q Science
Depositing User: Catrina Hey
Date Deposited: 15 May 2012 10:46
Last Modified: 30 Nov 2012 17:12
URI: http://sro.sussex.ac.uk/id/eprint/39104
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