CO2加富对盐胁迫下番茄幼苗生长和渗透调节特性的影响  

Effects of CO2 Enrichment on Seedling Growth and Osmotic Regulation Characteristics of Tomato under Salt Stress

作　　者：李旭芬 石玉[1] 李斌 侯雷平[1] 邢国明[1] 张毅[1] LI Xufen;SHI Yu;LI Bin;HOU Leiping;XING Guoming;ZHANG Yi(Collaborative Innovation Center of Quality and Profit Improvement for the Protected Vegetables of Shanxi Province,College of Horticulture,Shanxi Agricultural University,Taigu Shanxi 030801,China)

机构地区：[1]山西农业大学园艺学院/山西省设施蔬菜提质增效协同创新中心

出　　处：《西北农业学报》2019年第8期1309-1316,共8页Acta Agriculturae Boreali-occidentalis Sinica

基　　金：第63批中国博士后科学基金面上项目(2018M631769);国家自然科学基金青年科学基金(31501807,31501750,31501806)~~

摘　　要：以‘中杂9号’番茄为试材,用80mmol/LCa(NO3)2胁迫模拟设施土壤次生盐渍化,(800±40)μmol/mol模拟CO2加富环境,研究CO2加富对盐胁迫下番茄幼苗生长及渗透调节特性的影响.结果表明:与对照相比,盐胁迫显著抑制番茄生长,且叶片相对含水量、叶片水势、根系水力学导度、根系形态参数和根系渗透势均不同程度降低;同时,叶片可溶性糖、植株游离氨基酸和脯氨酸的质量分数均显著升高,但叶片可溶性蛋白和植株有机酸的质量分数均显著降低.与单独盐胁迫相比,CO2加富处理显著提高盐胁迫植株的干鲜质量、叶片水势、根系长度、根系表面积、根系体积和根系渗透势,叶片可溶性蛋白、脯氨酸、有机酸的质量分数分别显著增加111.99%、10.93%和14.62%,根系可溶性蛋白和游离氨基酸的质量分数分别显著增加76.01%和76.97%,根系脯氨酸质量分数显著降低6.33%.综上所述,CO2加富能够通过改善植株水分状况和提高渗透调节能力,尤其是促进可溶性蛋白等渗透调节物质的积累来增强番茄幼苗的盐胁迫耐受性.In this study,tomato(Solanum lycopersicum L.)cultivar‘Zhongza No.9’was used as experimental material,80 mmol/L Ca(NO 3)2 was conducted to simulate the soil secondary salinization in protected agriculture,and(800±40)μmol/mol was used to simulate the CO2 enrichment environment.The effects of CO2 enrichment on the growth and osmotic regulation characteristics in tomato seedling exposed to salt stress were investigated.The results showed that compared with control treatment,salt stress significantly inhibited tomato growth.The leaf relative water content and water potential,the root hydraulic conductance,morphological parameters and osmotic potential were also decreased to different extent.Meanwhile,the soluble sugar mass fraction in leaves,the free amino acid and proline mass fraction in plants were increased significantly,but the soluble protein mass fraction in leaves,the organic acid mass fraction in plants were significantly decreased.In comparison with single salt treatment,CO2 enrichment significantly improved the dry and fresh quality,leaf water potential,root length,root surface area,root volume and root osmotic potential in salt-stressed plant.Besides,the mass fraction of soluble protein,proline and organic acid in leaves were significantly increased by 111.99%,10.93%and 14.62%,respectively,while the mass fraction of soluble protein and free amino acid in roots were significantly increased by 76.01%and 76.97%,respectively,and the proline mass fraction in roots were significantly lowered by 6.33%.In conclusion,CO2 enrichment could enhance the salt tolerance of tomato seedlings by improving the water status and osmotic adjustment capacity of the plants,especially promoting the accumulation of soluble protein.

关 键 词：CO2加富 CA(NO3)2胁迫 渗透调节 番茄 

分 类 号：S626.5[农业科学—园艺学]