盐胁迫下苯丙烯酸对黄瓜幼苗生长及根际土壤酶活性的影响  

Effects of Cinnamic Acid on Cucumber Seedling Growth and Rhizosphere Soil Enzyme Activities under Salt Stress

作　　者：李雪峤[1] 吴凤芝[1] 

机构地区：[1]东北农业大学园艺学院,黑龙江哈尔滨150030

出　　处：《中国蔬菜》2010年第18期15-22,共8页China Vegetables

基　　金：国家自然科学基金项目(30771252);黑龙江省教育厅项目(11531018)

摘　　要：以耐盐黄瓜品种津绿5号和盐敏感黄瓜品种津优1号为试材,以NaCl(585mg·kg-1)为盐胁迫条件,苯丙烯酸为自毒物质,研究了盐胁迫下不同浓度的苯丙烯酸(0、25、50、200mg·kg-1)对黄瓜幼苗生长及其根际土壤酶活性的影响。结果表明,盐胁迫降低了黄瓜幼苗的茎粗、株高和鲜质量,并对黄瓜幼苗根际土壤过氧化氢酶、转化酶、脲酶活性具有抑制作用,对过氧化物酶活性的促进作用不明显。低浓度苯丙烯酸(25mg·kg-1)对土壤过氧化氢酶、转化酶、脲酶活性具有促进作用,对盐胁迫有一定的缓解作用;高浓度苯丙烯酸(200mg·kg-1)对过氧化氢酶、转化酶、脲酶活性有抑制作用,且高浓度苯丙烯酸则进一步加重了盐胁迫程度。F检验结果表明,苯丙烯酸对土壤酶活性的影响强度较高,盐胁迫对各生长指标的影响较高。Salt-tolerant cucumber（Cucumis sativus L.）cultivar‘Jinlv No.5＇and salt-sensitive cucumber cultivar＇Jinyou No.1＇were used as materials.Taking NaCl（585 mg·kg-1）as salt-stress condition,effect of different concentrations of cinnamic acid（0,25,50,200 mg·kg-1）under salt stress condition on cucumber seedling growth and rhizosphere soil enzymes activities were studied.Results showed that salt-stress treatment could reduce the stem diameter,plant height and fresh weight of cucumber seedling;restrain rhizosphere soil catalase,invertase and urease activities of cucumber seedling;but the promoting effect on peroxidase activity was not obvious.Low concentration of cinnamic acid（25 mg·kg-1）has promoting effects on soil catalase,invertase and urease activities,certain relaxing effect on salt injury.High concentrations of cinnamic acid（200 mg·kg-1）has inhibitory effects on catalase,invertase and urease activities,and high concentrations of cinnamic acid aggravated the degree of salt stress.F-test results show that cinnamic acid has greater effect on soil enzyme activities and salt stress has greater effect on various growth index.

关 键 词：苯丙烯酸 NACL胁迫 土壤酶活性 黄瓜 

分 类 号：S642.2[农业科学—蔬菜学]