Journal
PLANT CELL AND ENVIRONMENT
Volume 32, Issue 5, Pages 486-496Publisher
WILEY
DOI: 10.1111/j.1365-3040.2009.01942.x
Keywords
Na(+)secretion; selective absorption for K+ over Na+; selective transport for K+ over Na+; unidirectional Na-22(+) influx and efflux
Categories
Funding
- National Basic Research Program of China [2007CB108901]
- National Natural Science Foundation of China [30700562]
- New Century Excellent Talents, China [NCET-05-0882]
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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 Na-22(+) fluxes in roots were carried out. It was firstly found that unidirectional Na-22(+) 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.
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