Effects of K＋ on Na＋ uptake and accumulation in a wild Halophyte grass Suaeda maritime

摘要

Limiting Na＋ uptake and accumulation in the cytosol is the key measure to improve plant salt tolerance ( Flowers, 2004).However, Na＋ uptake pathways in higher plants are not so clear by now.Wang et al.(2007) reported that two distinct low‐affinity Na＋ uptake pathways exist in S.maritima : Pathway 1 might be mediated by a high‐affinity K＋ transporter under 25 mM NaCl that is insensitive to TEA＋ or Cs＋, but sensitive to Ba2 ＋ and pathway 2 by an AKT1‐type channel under 150 mM NaCl that is sensitive to TEA＋, Cs＋, or Ba2 ＋.Here we reported that the turning‐point of external salt concentrations for the two pathways and the effects of K＋ on 22 Na＋ influx and accumulation in S.maritima.