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1、棉花学报CottonScience2015袁27渊3冤院208―215++盐胁迫下棉花K和Na离子转运的耐盐性生理机制*王宁袁杨杰袁黄群袁苏桂兰袁周红袁许庆华袁董合林袁严根土渊中国农业科学院棉花研究所/棉花生物学国家重点实验室,河南安阳455000冤摘要院为了探究棉花的耐盐机制袁以中棉所49尧中棉所35和中51504为材料袁研究了盐胁迫对棉花幼苗的生长及K+/Na+平衡生理的影响遥结果表明袁150mmol窑L－1NaCl处理对幼苗的生长具有明显抑制作用袁降低了叶片的光合速率(Pn)尧PSⅡ实际光量子产额(椎PSII)和电子传递速率(ETR)袁
2、增加了非光化学荧光猝灭系数(qN)遥与中棉所49和中棉所35相比袁中51504的干物质累积受盐胁迫影响最小袁且保持较高的Pn尧椎PSII尧ETR和qN值及较低的ETR/P值遥盐胁迫提高了棉花组织中Na+的浓度袁降低了K+的浓度曰但中51504组织中保持了相对较低n的Na+浓度和较高的K+浓度袁维持了较高的K+/Na+比曰通过非损伤微测技术(NMT)测定的离子流结果也表明袁中51504的根系对Na+有较强的外排能力袁而对K+有较强的保留和向地上部转运能力遥能够有效地调节Na+和K+的跨膜转运进而维持K+/Na+平衡是棉花耐盐的重要生理机制之一遥
3、关键词院棉花曰盐胁迫曰耐盐性曰离子流曰Na+/K+离子动态中图分类号院S562.01文献标志码院A文章编号院1002-7807渊2015冤03-0208-0810.11963/issn.1002-7807.201503003*WangNing,YangJie,HuangQun,SuGuilan,ZhouHong,XuQinghua,DongHelin,YanGentu(455000)Salinitystressisoneofthemajorabioticfactorsaffectingthegrowthandproductivityofcot
4、ton(L.).Tofurtherunderstandthepossiblemechanismofsalttolerance,anexperimentwasconductedtoinvestigatetheeffectofsaltstressongrowthandK+/Na+homeostasisofcottonseedlingsusingthreecultivars(CCRI49,CCRI35andZhong51504).Wefoundthat150mmol窑L－1NaCltreatmentsignificantlydecreasedbio
5、massaccumulation,photosynthesisrate(P),photochemicalnquenching(qP),photochemicalquantumyieldofphotosystem(椎PSII)andelectrontransportrate(ETR),butsignificantlyincreasednon-photochemicalquenchingcoefficients(qN)inPSII.ThebiomassaccumulationofZhong51504waslessaffectedbysaltstr
6、essthanCCRI49orCCRI35,andZhong51504alsoretainedhigherPn,椎PSII,ETRandqNbutlowerETR/Pnundersalineconditions.Comparedwiththecontrol,thesalinitytreatmentcausedasignificantriseinNa+concentrationanddecreasedK+concentration.ThelimitednegativeimpactinZhong51504derivedfromthelowerco
7、ntentofNa+andhigherK+inthetissuesundersaltstress.Asexpected,Zhong51504alsoretainedahigherNa+/K+ratiothanothercultivarsundersalttreatment.Experi-mentsofsaltshockandlongexposuretosalttestedbythenon-invasiveionfluxmeasuringtechniquealsorevealedthatZhong51504notonlyhadhigherNa+
8、exclusionbutalsoshowedbetterK+retention.OurresultsindicatedthatmaintainingtheK+/Na
