摘要
以金针菇为试验材料,在基质中分别单独添加和同时添加不同浓度的Cd、Zn,采用栽培袋接种培养法研究了食用菌富集Cd、Zn以及Cd、Zn交互作用对食用菌累积重金属的影响。结果表明,低浓度的Cd(<1mg·kg-1)、Zn(<600mg·kg-1)能够促进金针菇的生长,但是高浓度的Cd、Zn对金针菇生长会产生抑制作用。随着栽培基质中Cd、Zn处理浓度的增高,金针菇子实体中的Cd、Zn浓度也随之增加。Cd-Zn之间表现为互相拮抗作用,金针菇子实体内的Cd含量随着培养基质中Zn浓度的增加而显著降低(P<0.05),Cd浓度降低比例与Zn/Cd比值之间呈显著的正相关(P<0.01)。在Zn处理浓度为600mg·kg-1,Cd处理浓度分别为1mg·kg-1和10时,与不加Zn相比,金针菇子实体Cd含量分别降低29%和11%。Cd对Zn也表现出一定的拮抗作用,但是除在Zn为0和Cd为10mg·kg-1处理时拮抗作用显著(P<0.05)外,其余处理没有达到显著水平。而在10mg·kg-1Cd和600mg·kg-1Zn处理条件下,金针菇生物量显著下降,可能是由于Cd-Zn协同作用,造成毒害作用的结果。
The edible fungi have been a very popular delicacy especially in China and some central European countries because they are a good source of carbohydrate, protein, fats, and minerals. However the edible fungi can also accumulate heavy metals from the environment. A substrate cultivating experiment was conducted to study the effect of Cd, Zn, and their interaction on the accumulation of heavy metals in the Flammulina velutipes. The results showed that the yield of Flammulina velutipes was improved at lower doses of Cd (〈1mg·kg^-1) or Zn( 〈600 mg·kg^-1) treatments, followed by inhibition at higher doses. Cd or Zn concentrations increased gradually with the increasing levels of Cd or Zn in the cultivation substrate. Cd-Zn antagonism was observed when Cd and Zn were supplied together, Cd concentrations in Flammulina velutipes were reduced significantly as increasing concentration of Zn in the cultivation substrate( P〈0.05 ). In addition, the percentage of decreased Cd concentrations increased linearly with the increasing ratio of Zn and Cd (P〈0.01 ). At the Zn level of 600 mg·kg^-1, Cd concentrations in Flammulina velutipes decreased by 29% and 11% for the Cd level of 1 mg·kg^-1 and 10 mg·kg^-1 respectively, compared with no Zn addition. Furthermore we also founded that Zn concentrations in Flammulina velutipes were reduced as increasing concentration of Cd in the cultivation substrate. However, there was no significant difference with the exception of 0 Zn mg·kg^-1 and 10 Cdmg·kg^-1 treatment. The yield of Flammulina velutipes was inhibited at 10 mg·kg^-1 Cd and 600 mg·kg^-1 Zn treatment, which maybe the toxicity of Cd-Zn synergistic action.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2009年第7期1368-1373,共6页
Journal of Agro-Environment Science
基金
农业部948重大国际合作项目(2003-Z53)-养分资源综合管理
关键词
食用菌
锌
镉
拮抗作用
edible fungi
Zn
Cd
antagonism