Cai, Jianyi

Flowers, Timothy J.

Wang, Suomin

Zhang, Jinlin

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Effects of K+ on Na+ Uptake and Accumulation in a Wild Halophyte Grass Suaeda maritime Jinlin Zhang Lanzhou University, China Suomin Wang Lanzhou University, China Timothy J. Flowers University of Sussex, UK Jianyi Cai Lanzhou University, China Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/2-3/5 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 瞯 ]400　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Soil Quality and Plant NutritionEffects of K＋ on Na＋ uptake and accumulation in a wild Halophyte grass Suaeda maritimeJinL in Zhang１ ,SuoMin W ang１ ,T imothy J . Flowers２ , JianY i Cai１１ School o f Pastoral A griculture Science and Technology , Key L ab o f G rassland A gro‐ecosystem , M inistry o f A griculture ,L anz hou University , L anz hou ７３００００ ,China ; ２ School o f L i f e Sciences , University o f Sussex , Falmer , Brighton , SussexBN１ ９QG , UK ,E‐mail : j lz hang＠ lz u .edu .cnKey words :K ＋ transporters , ２２ Na＋ influx , Na ＋ accumulationIntroduction 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 distinctlow‐affinity Na＋ uptake pathways exist in S . maritima : Pathway １ might be mediated by a high‐affinity K ＋ transporter under２５ mM NaCl that is insensitive to TEA ＋ or Cs ＋ , but sensitive to Ba２ ＋ and pathway ２ by an AKT１‐type channel under １５０ mMNaCl that is sensitive to TEA ＋ , Cs ＋ , or Ba２ ＋ . Here we reported that the turning‐point of external salt concentrations for thetwo pathways and the effects of K ＋ on ２２Na ＋ influx and accumulation in S . maritima .Materials and methods １７‐day‐old seedlings were transferred to non‐KNO３ Hoagland solution supplemented with ３concentrations (０ , １０ , and ５０ mM ) of KCl and various concentrations ( ２ .５ to ２００ mM ) of NaCl for ３ d before beingtransferred to equivalent solutions labeled with ２２ Na＋ or harvested for measurements of influx or concentrations , respectively .Values are means SD( n＝ ６ for influx or ８ for concentration test) and bars indicate SD ( P＜ ０ .０５ , Duncan test) .Results Ba２ ＋ inhibited ２２Na ＋ influx significantly under various NaCl concentrations , however , TEA ＋ showed significant effectsin reducing ２２Na ＋ influx when the external NaCl concentration was above １００ mM ( Figure １ ) . １０ mM KCl had no significanteffect on ２２ Na＋ influx under various NaCl concentrations , but ５０ mM KCl blocked ２２Na ＋ influx significantly when NaClconcentration was above １００ Mm( Figure ２) . １０ and ５０ mM KCl both reduced NaCl concentration in roots under various NaClconcentrations ( Figure ３ ) , however , NaCl concentrations in shoots were reduced by ５０ mM KCl when external NaClconcentration was below ７５ mM and by １０ mM KCl when below ２５ mM ( Figure ４) .　 　 Figure 1 E f f ects o f TEA ＋ and Ba2 ＋ on22 Na＋ in f lux . Figure 2 E f f ects o f K＋ on 22 Na＋ in f luxunder v arious NaCl concentrations .Figure 3 E f f ects o f K ＋ on Na＋ accumulation in roots . Figure 4 E f f ects o f K ＋ on Na＋ accumulation in shoots .Conclusions The turning‐point of external salt concentrations for the two pathways was between ７５ and １００ mM . K ＋ （１０ or ５０mM) had no effect on ２２ Na ＋ influx at concentrations below ７５ mM NaCl , but ２２ Na＋ influx was inhibited by ５０ mM K ＋ whenthe external concentration of NaCl was above ７５ mM . However , the affecting mode of K ＋ on NaCl concentration in both rootsand shoots with increasing external concentration was different from that on ２２ Na＋ influx .ReferenceFlowers T .J . ( ２００４) Improving crop salt tolerance . Journal o f Ex perimental Botany ５５ : ３０７‐３１９ .Wang S . M . , Zhang J .L . , Flowers T . J . ( ２００７ ) Low‐Affinity Na＋ Uptake in the Halophyte Suaeda maritima . Plantphysiology , １４５ :５５９‐５７１ .2.5 25 50 75 I 00 I 0 200 NaCl Concentration(mM) 2 120 ~ □ Control 100 0 ■ I0mMKCI 0 □ 50mMKCI -~ 80 ~ 60 ~ 8 40 +" z 20 0 0 0 "" 10 25 50 75 100 125 150 175 200 NaCl concentration (mM) :,: ? 2 4 ~ ----------------~ 'E §: 2 "-~ 1.6 0 E 1.2 2, 3 0.8 ,;: .E 0.4 --+-Control --o-JOmM KC\ --¾-50mMKCI o~--~---~--~---~--_, 0 50 100 150 200 250 NaCl concentration (mM) 400 ~ 350 □ Control 0 300 ■ I0mM KCI 0 □ 50mMKCI ·g 250 0 200 u u 0 8 ," z 50 0 0 0 ~ 0 10 25 50 75 100 125 150 175 200 en NaCl concentration (mM) 

Effects of K\u3csup\u3e+\u3c/sup\u3e on Na\u3csup\u3e+\u3c/sup\u3e Uptake and Accumulation in a Wild Halophyte Grass \u3cem\u3eSuaeda maritime\u3c/em\u3e

https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=2567&amp;context=igc

Effects of K\u3csup\u3e+\u3c/sup\u3e on Na\u3csup\u3e+\u3c/sup\u3e Uptake and Accumulation in a Wild Halophyte Grass \u3cem\u3eSuaeda maritime\u3c/em\u3e

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