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RISS 인기검색어
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- 저자 : Raddatz, Natalia (검색결과 1 건)
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A Single Amino-Acid Substitution in the Sodium Transporter HKT1 Associated with Plant Salt Tolerance
Ali, Akhtar,Raddatz, Natalia,Aman, Rashid,Kim, Songmi,Park, Hyeong Cheol,Jan, Masood,Baek, Dongwon,Khan, Irfan Ullah,Oh, Dong-Ha,Lee, Sang Yeol,Bressan, Ray A.,Lee, Keun Woo,Maggio, Albino,Pardo, Jose American Society of Plant Biologists 2016 Plant Physiology Vol.171 No.3
<P>A crucial prerequisite for plant growth and survival is the maintenance of potassium uptake, especially when high sodium surrounds the root zone. The Arabidopsis HIGH-AFFINITY K+ TRANSPORTER1 (HKT1), and its homologs in other salt-sensitive dicots, contributes to salinity tolerance by removing Na+ from the transpiration stream. However, TsHKT1; 2, one of three HKT1 copies in Thellungiella salsuginea, a halophytic Arabidopsis relative, acts as a K+ transporter in the presence of Na+ in yeast (Saccharomyces cerevisiae). Amino-acid sequence comparisons indicated differences between TsHKT1; 2 and most other published HKT1 sequences with respect to an Asp residue (D207) in the second pore-loop domain. Two additional T. salsuginea and most other HKT1 sequences contain Asn (N) in this position. Wild-type TsHKT1; 2 and altered AtHKT1 (AtHKT1(N-D)) complemented K+-uptake deficiency of yeast cells. Mutant hkt1-1 plants complemented with both AtHKT1(N-D) and TsHKT1; 2 showed higher tolerance to salt stress than lines complemented by the wild-type AtHKT1. Electrophysiological analysis in Xenopus laevis oocytes confirmed the functional properties of these transporters and the differential selectivity for Na+ and K+ based on the N/D variance in the pore region. This change also dictated inward-rectification for Na+ transport. Thus, the introduction of Asp, replacing Asn, in HKT1-type transporters established altered cation selectivity and uptake dynamics. We describe one way, based on a single change in a crucial protein that enabled some crucifer species to acquire improved salt tolerance, which over evolutionary time may have resulted in further changes that ultimately facilitated colonization of saline habitats.</P>
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