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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 +
Author(s) -
WANG CHUNMEI,
ZHANG JINLIN,
LIU XUESONG,
LI ZHAN,
WU GUOQIANG,
CAI JIANYI,
FLOWERS TIMOTHY J.,
WANG SUOMIN
Publication year - 2009
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.2009.01942.x
Subject(s) - halophyte , chemistry , salinity , efflux , limiting , selectivity , sodium , salt (chemistry) , horticulture , botany , biology , biochemistry , mechanical engineering , ecology , organic chemistry , engineering , catalysis
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 m m 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 .