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《不同浓度盐胁迫对黄瓜幼苗生长和生理代谢的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、江苏农业学报(JiangsuJ.ofAgr.Sci.),2014,30(1):172~177172http://www.jsnyxb.com韩冰,徐刚,郭世荣,等.不同浓度盐胁迫对黄瓜幼苗生长和生理代谢的影响[J].江苏农业学报,2014,30(1):172-177.doi:10.3969/j.issn.1000-4440.2014.01.030不同浓度盐胁迫对黄瓜幼苗生长和生理代谢的影响11231111韩冰,徐刚,郭世荣,贺超兴,孙艳军,高文瑞,李德翠,史珑燕(1.江苏省农业科学院蔬菜研究所,江苏南京210014;2.南京农业大学园艺学院,农业部南方蔬菜遗传改良重点开
2、放实验室,江苏南京210095;3.中国农业科学院蔬菜花卉研究所,北京100081)摘要:采用基质栽培,选用抗盐性较强的黄瓜品种新泰密刺为试验材料,研究了不同浓度(0、0.3%、0.6%、0.9%、1.2%)NaCl处理对黄瓜幼苗生长和光合特性等生理代谢的影响。结果表明,盐胁迫下,黄瓜幼苗株高降低,茎粗减少,净光合速率(Pn)、气孔导度(Gs)、气孔限制值(Ls)、蒸腾速率(Tr)和水分利用率(WUE)均减小,细胞间隙CO2浓度(Ci)增大,细胞膜伤害率增大,丙二醛(MDA)和可溶性蛋白含量升高,超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)活性增
3、加,且随着盐胁迫浓度的升高各指标变化幅度增大。高浓度(0.9%、1.2%)NaCl处理下,叶片的生长受到明显抑制,幼苗存活率下降,各生理指标与对照相比发生显著变化。综合来看,0.3%NaCl处理对黄瓜幼苗生长和各生理指标影响较小,0.6%和0.9%NaCl处理下,黄瓜幼苗生物量显著下降,1.2%则达到了黄瓜幼苗生长的极限盐浓度。关键词:盐胁迫;黄瓜;生长;生理代谢中图分类号:S642.201文献标识码:A文章编号:1000-4440(2014)01-0172-06Growthandphysiologicalmetabolismofcucumberseedlingsinr
4、esponsetodifferentconcentrationsofsaltstress1123111HANBing,XUGang,GUOShi-rong,HEChao-xing,SUNYan-jun,GAOWen-rui,LIDe-cui,1SHILong-yan(1.InstituteofVegetableCrops,JiangsuAcademyofAgriculturalSciences,Nanjing210014,China;2.CollegeofHorticulture,NanjingAgriculturalUni-versity,KeyLaboratoryo
5、fSouthernVegetableCropGeneticImprovement,MinistryofAgriculture,Nanjing210095,China;3.InstituteofVegetablesandFlowers,ChineseAcademyofAgriculturalSciences,Beijing100081,China)Abstract:AcucumbercultivarXintaiMiciwasusedinthisexperimenttostudytheeffectsofdifferentconcentrationsofNaCl(0,0.3%
6、,0.6%,0.9%and1.2%)ongrowthandphysiologicalmetabolismofsubstrate-culturedcucumber(Cuc-umissativusL.)seedlings.UnderNaClstress,thephotosyntheticrate(Pn),stomatalconductance(Gs),stomatallimitationvalue(Ls),transpirationrate(Tr)andwateruseefficiency(WUE)decreased,andwhiletheintercellularCO2c
7、oncentration(Ci),cellmembranedamagerate,malondialdehyde(MDA)andsolubleproteincontentsincreased,superoxidedismutase(SOD),peroxidase(POD)andcatalase(CAT)activitiesimproved.Thechangeofeachindexwasmoreobviouswiththein-creaseofsaltconcentrations.Highconcentrations(0.9%收稿日期:201
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