Cd/Cr复合胁迫下不同品种蔬菜对Cd和Cr积累与转运的差异研究  

Study on the Variety Difference of Cd and Cr Accumulation and Translocation in Vegetable Under Cd/Cr Combination Stress

作　　者：任艳军[1] 任学军[1] 马建军[1] 杜彬[1] 闫立英[1] 秦素平[1] 马为民[1] REN Yanjun;REN Xuejun;MA Jianjun;DU Bin;YAN Liying;QIN Suping;MA Weimin(Hebei Normal University of Science ＆ Technology, Qinhuangdao, Hebei 06600)

机构地区：[1]河北科技师范学院,河北秦皇岛066004

出　　处：《核农学报》2018年第5期993-1002,共10页Journal of Nuclear Agricultural Sciences

基　　金：河北省高等学校科学技术研究重点项目(ZD20131020);河北省现代农业产业技术体系蔬菜创新团队建设资助项目(QN2015101);河北省秦皇岛市环保专项资金补贴项目(2014)

摘　　要：为筛选土壤重金属复合污染环境下低积累重金属蔬菜的预防品种,提高叶菜类蔬菜质量与安全,本研究采用盆栽试验,比较了Cd/Cr复合胁迫下17个蔬菜品种对重金属Cd和Cr的积累与转运的差异。结果表明,Cd/Cr复合胁迫下,17个蔬菜品种地上部茎叶中Cd和Cr含量差异显著,其含量均值分别为0.645±0.212 mg·kg FW-1和0.222±0.092 mg·kg FW-1,变异系数(CV)分别为32.87%和41.44%;Cd和Cr的转运系数(TF)均值分别为1.031±0.157和0.102±0.028,与对照相比分别增加41.43%和下降37.80%;地上部Cd积累是造成不同蔬菜品种植株生物量下降和耐性差异的主要因子;Cd/Cr复合胁迫下,不同蔬菜品种茎叶中Cd、Cr含量和转运系数的变化与对照相应品种间的变化均呈显著或极显著正相关,表明不同蔬菜品种重金属积累与转运具有遗传稳定性;聚类分析表明,17个蔬菜品种地上部Cd、Cr含量和转运系数由低到高分为4个类群,其中华绿二号(HL2)品种同时具有最低的Cd、Cr积累和转运能力,可推荐其作为Cd/Cr中轻度复合污染土壤环境下的重金属污染预防品种(Cd+Cr-PSC)。本研究为叶菜类蔬菜低积累品种选育及解决中、轻度复合污染土壤的可持续利用和食品安全提供了有效途径。The objective of this study was to screen out vegetable cultivars with low Cd and Cr accumulations,and to improve the quality and safety of leafy vegetables. Pot-culture experiments were used to study the variety difference of Cd and Cr accumulation and translocation in 17 vegetable cultivars under Cd/Cr combination stress. There were significant variety differences in shoot Cd and Cr concentrations among the 17 vegetable cultivars; the mean concentrations were0. 645 ± 0. 212 mg·kg FW-1 and 0. 222 ± 0. 092 mg·kg FW-1,and the coefficient of variation（ CV） was 32. 87% and41. 44%,respectively. The mean translocation factors（ TF） of Cd and Cr were 1. 031 ± 0. 157 and 0. 102 ± 0. 028,which increased 41. 43% and decreased 37. 80% compared with CK, respectively. Moreover, there were great differences in tolerance among different vegetable cultivars. Shoot Cd accumulation was the main factor causing decreased plant biomass and differences in tolerance. There were significant or very significant positive correlations between the concentrations, the translocation factors of different vegetable varieties, and CK. Accumulation and translocation of Cd and Cr in different vegetable varieties were stable hereditary. Based on the Cd,Cr concentrations,and translocation factors from low to high suggested the 17 vegetable cultivars were divided into 4 groups. The HL2 vegetable cultivar,with low Cd and Cr accumulation and translocation,could be considered to be the Cd/Cr pollutionsafe cultivar.

关 键 词：复合胁迫 蔬菜 Cd和Cr 积累与转运 品种差异 

分 类 号：S63[农业科学—蔬菜学] X53[农业科学—园艺学]