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Puccinellia tenuiflora maintains a low Na+ level under salinity by limiting unidirectional Na+ influx resulting in a high selectivity for K+ over Na+
journal contribution
posted on 2023-06-08, 11:31 authored by Chun-Mei Wang, Jin-Lin Zhang, Xue-Song Liu, Zhan Li, Guo-Qiang Wu, Jian-Yi Cai, Tim Flowers, Suo-Min WangPuccinellia 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.
History
Publication status
- Published
Journal
Plant, Cell & EnvironmentISSN
0140-7791Publisher
Blackwell PublishingExternal DOI
Issue
5Volume
32Page range
486-496Department affiliated with
- Evolution, Behaviour and Environment Publications
Notes
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-MinFull text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2012-05-15Usage metrics
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