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, Liu, 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 (22)Na(+) fluxes in roots were carried out. It was firstly found that unidirectional (22)Na(+) 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
Schools and Departments: School of Life Sciences > Biology and Environmental Science
Subjects: Q Science > QK Botany > QK0710 Plant physiology
Depositing User: Catrina Hey
Date Deposited: 14 May 2012 12:23
Last Modified: 30 Nov 2012 17:13
URI: http://sro.sussex.ac.uk/id/eprint/39201
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