CO2加富对盐胁迫下西瓜幼苗生长及生理生化特性的影响  

Effects of CO2 Enrichment on Growth,Physiological and Biochemical Characteristics of Watermelon Seedlings under Salt Stress

作　　者：束秀玉[1] SHU Xiuyu(Yancheng Biological Engineering Higher Vocational Technology School,Yancheng 224051,China)

机构地区：[1]盐城生物工程高等职业技术学校,江苏盐城224051

出　　处：《河南农业科学》2020年第12期107-114,共8页Journal of Henan Agricultural Sciences

摘　　要：以迁丽1号西瓜嫁接苗为试验材料,研究CO2加富对西瓜幼苗盐害的缓解效应及作用机制,旨在为提高设施西瓜耐盐性提供理论依据。结果表明,单独盐胁迫(400μmol/mol CO2+80 mmol/L NaCl)显著抑制了西瓜幼苗生长,且相对含水量、水势、渗透势、根系水力学导度及净光合速率(Pn)均显著降低,而相对电导率、MDA含量、O2·-产生速率、H2O2含量及抗氧化酶活性则均显著提升(P<0.05)。CO2加富(800μmol/mol+80 mmol/L NaCl)显著促进盐胁迫下西瓜幼苗生长,缓解盐害效应(P<0.05)。与单独盐胁迫相比,CO2加富的西瓜幼苗株高、茎粗、干质量和总根长分别提高25.42%、11.62%、21.61%和30.49%,盐害指数显著降低49.80%(P<0.05);相对含水量、水势、渗透势、根系水力学导度、Pn及超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)和抗坏血酸过氧化物酶(APX)活性分别提升21.60%、71.06%、19.05%、17.11%、15.13%、18.77%、13.04%、13.23%和13.29%,而气孔导度(Gs)、胞间二氧化碳浓度(Ci)、蒸腾速率(Tr)、相对电导率、MDA含量、O2·-产生速率和H2O2含量则分别显著降低23.91%、8.12%、14.84%、11.42%、16.00%、13.21%和20.51%(P<0.05)。综上所述,CO2加富可通过提高西瓜幼苗吸水保水能力、净光合速率和抗氧化酶活性来缓解盐胁迫伤害,提高耐盐性。In order to provide theoretical basis for improving salt tolerance of protected watermelon,the grafted seedlings of watermelon cultivar Qianli No.1 were used as experimental material,and the mitigative effect and mechanism of CO2 enrichment on watermelon seedlings under salt stress were investigated.The results showed that compared with control,the growth of watermelon seedlings were significantly inhibited under salt stress(400μmol/mol CO2+80 mmol/L NaCl).The leaf relative water content,water potential,the root hydraulic conductance and osmotic potential and net photosynthetic rate(Pn)were also decreased to different extent.Meanwhile,the relative conductivity,MDA content,oxygen production rate,H2O2 content and antioxidant enzyme activity were significantly increased(P<0.05).The injury effect of watermelon seedlings were significantly alleviated and the growth was significantly improved by CO2 enrichment(800μmol/mol+80 mmol/L NaCl)under salt stress(P<0.05).In comparison with single salt stress treatment,the plant height,stem diameter,dry weight and total root length of salt-stressed watermelon seedlings enriched with CO2 were significantly increased by 25.42%,11.62%,21.61%and 30.49%,respectively,and the salt damage index was significantly decreased by 49.80%;the relative water content,water potential,osmotic potential,root hydraulic conductivity,Pn,superoxide dismutase(SOD),peroxidase(POD),catalase(CAT)and ascorbic acid peroxidase(APX)activities of salt-stressed watermelon seedlings enriched with CO2 were significantly increased by 21.60%,71.06%,19.05%,17.11%,15.13%,18.77%,13.04%,13.23%and 13.29%,respectively,but the stomatal conductance(Gs),intercellular carbon dioxide concentration(Ci),transpiration rate(Tr),relative conductivity,MDA content,oxygen production rate and H2O2 content were significantly decreased by 23.91%,8.12%,14.84%,11.42%,16.00%,13.21%and 20.51%,respectively(P<0.05).In conclusion,CO2 enrichment could alleviate salt stress injury,and improve salt tolerance by improving water absorption and ret

关 键 词：西瓜 盐胁迫 CO2加富 生长 生理生化特性 

分 类 号：S651[农业科学—果树学]