摘要
采用盆栽试验研究了重金属Cd(20 mg·kg-1)污染下,黑麦草-丛枝菌根对2个番茄品种生长、叶和根丙二醛(MDA)含量、抗氧化酶活性、Cd积累及化学形态的影响.结果表明,番茄果实干重和植株总干重、叶和根抗氧化酶活性及丙二醛含量、植株各部位Cd含量及积累量在不同品种和处理间的差异达到显著性水平.黑麦草和丛枝菌根单一或复合修复显著提高了2个番茄品种的果实、根、茎、叶及总干重,降低了叶和根的MDA含量及过氧化氢酶(CAT)、超过氧化物歧化酶(SOD)和过氧化物酶(POD)活性.黑麦草和丛枝菌根单一或复合修复降低了2个番茄品种果实中Cd提取总量和各形态Cd含量,降幅分别为19.4%~52.4%、31.0%~75.2%、19.7%~59.1%、3.1%~48.2%、20.0%~65.0%、40.7%~100.0%和15.2%~50.0%.Cd主要积累在番茄的叶和茎,果实和根积累较少.黑麦草和丛枝菌根单一或复合修复不同程度降低了番茄果实、叶、茎和根中的Cd含量;减少了茎Cd积累量和植株全Cd量.'Cd+黑麦草+丛枝菌根'处理还减少了2个番茄品种果实的Cd积累量,降幅分别为42.9%和43.7%.供试2个番茄品种,以'洛贝琪'对Cd的耐性和抗性较强,果实Cd含量和积累量及植株Cd总积累量则以'洛贝琪'<'德福mm-8'.
Pot experiments were carried out to investigate the effects of ryegrass and arbuscular mycorrhiza on the plant growth,malondialdehyde( MDA),antioxidant enzyme activities of leaf and root,accumulation and chemical forms of cadmium( Cd) in tow varieties of tomato when exposed to Cd( 20 mg·kg-1). The results showed that dry weights of fruit and plant,and contents of malondialdehyde( MDA) and antioxidant enzyme activities of leaf and root,and concentrations and accumulations of Cd significantly differed between two varieties of tomato. Dry weights of fruit,roots,stem,leaf and plant were increased by single or combined remediation of ryegrass and arbuscular mycorrhiza,while MDA contents and antioxidant enzyme activities of leaf and root reduced. The total extractable Cd,FE,FW,FNaCl,FHAc,FHCl,and FRin fruit of two varieties of tomato reduced by 19. 4%-52. 4%,31. 0%-75. 2%,19. 7%-59. 1%,3. 1%-48. 2%,20. 0%-65. 0%,40. 7%-100. 0% and 15. 2%-50. 0%, respectively. Cadmium accumulations in tomato were in the order of leaf > stem > fruit > root. Cadmium concentrations in leaf,stem,root and fruit of both varieties decreased by single or combined remediation of ryegrass and arbuscular mycorrhiza,and Cd accumulations of stem and plant of two varieties also reduced. Cd accumulations in fruit of two varieties decreased by 42. 9% and 43. 7% in the combined remediation treatments,respectively. Tolerance and resistance of‘LUO BEI QI'on Cd was more than‘De Fu mm-8',and Cd concentrations and Cd accumulations in fruit and plant were in the order of ‘LUO BEI QI'<‘De Fu mm-8'in the presence or absence of single or combined remediation of ryegrass and arbuscular mycorrhiza.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2014年第6期2349-2357,共9页
Environmental Science
基金
现代农业产业技术体系建设专项(CARS-25-C-05)
国家自然科学基金项目(20477032)
国家科技支撑计划项目(2007BAD87B10)
关键词
黑麦草-丛枝菌根
抗氧化酶
镉累积
镉形态
番茄品种
ryegrass and arbuscular mycorrhiza
antioxidant enzyme
accumulation of cadmium
chemical forms of cadmium
varieties of tomato
