摘要
为研究早开堇菜(Viola prionantha)对镉(Cd)的耐性及其对Cd的富集特征,使用盆栽方法对早开堇菜进行不同浓度水平Cd处理。结果表明,低浓度Cd(≤10 mg·kg-1)促进早开堇菜的生长。当Cd浓度为5 mg·kg-1时,早开堇菜植株地下部分、地上部分生物量显著高于对照(P<0.05),达到最大。随Cd处理浓度的升高,其叶绿素含量逐渐下降,超氧化物歧化酶(SOD)、抗氧化物酶(POD)、过氧化氢酶(CAT)活性先升高后降低,丙二醛(MDA)含量则先下降后上升。当Cd处理浓度≤10 mg·kg-1时,SOD、POD、CAT表现出较高的活性,与对照无Cd处理相比,MDA含量未显著增加(P>0.05),叶绿素合成也未受到显著抑制,说明早开堇菜对Cd污染有较强的耐性。本研究中,早开堇菜对Cd的富集系数和转运系数均大于1.0。当Cd处理浓度为5 mg·kg-1时,早开堇菜植株地上部Cd含量为113.083 mg·kg-1,达到了Cd超富集植物的筛选标准。因此,早开堇菜在修复Cd污染土壤方面具有一定的潜在应用价值。
In order to study the physiological effects of cadmium（ Cd） on Viola prionantha,the responses of growth and enrichment characteristics of V. prionantha to the Cd were evaluated. The results showed that the growth of plants was promoted under the low Cd concentration（ ≤10 mg·kg-1）,and the biomass of root and shoot of the plants exposed to Cd significantly increased（ P〈0. 05） when compared to the controls which reached the peaks when the Cd concentration was 5 mg·kg-1. With the increase of Cd concentration,the chlorophyll content decreased,the activities of SOD,POD,CAT all increased firstly and then decreased,whereas,the MDA content decreased firstly and then increased. The activities of SOD,POD and CAT were higher than those of the control,while the contents of MDA and the chlorophyll did not change in the leaves compared to those in the control at concentration of 10 mg·kg-1Cd treatments. On the other hand,the bioaccumulation and translocation of V. prionantha to Cd were more than 1. 0,which confirmed the standard of Cd hyperaccumulator. Therefore V. prionantha can be classified into the Cd hyperaccumulator plants. The above results suggested that V. prionantha can be applied to purify contaminated environment which not only remedied contaminated environments but also bring landscape effects.
出处
《草业科学》
CAS
CSCD
北大核心
2016年第1期54-60,共7页
Pratacultural Science
基金
国家自然科学基金项目(31300514)
四川省"十二五"科技攻关项目林木新品种选育(2011YZGG)
关键词
早开堇菜
镉
耐性
富集特征
植物修复
Viola prionantha
cadmium
tolerance
enrichment
phytoremediation
