摘要
以小青菜品种"四月蔓"和"上海青"为试材,采用土培方法,研究模拟镉(Cd)污染对2个小青菜品种生长、Cd吸收累积和亚细胞分布的影响,以期探索2个小青菜品种对Cd的耐性及解毒机理以及其在Cd污染土壤的植物修复中的应用潜力。结果表明:模拟Cd污染下,小青菜品种"四月蔓"的生长受影响较小,且随Cd浓度增加这种趋势越明显,而"上海青"生长显著受抑(P<0.05);在2个Cd污染水平下,"四月蔓"地上部和总Cd积累量均显著高于"上海青"(P<0.05),此外,"四月蔓"对Cd的富集系数和转移系数均大于1,且显著高于"上海青";2个小青菜品种吸收的Cd主要存在于细胞壁中,相比较而言,"四月蔓"吸收的Cd在细胞壁中的分配比率显著高于"上海青",但在细胞器中的分配比率显著低于"上海青",在2个Cd污染水平下,"四月蔓"地上部细胞器中Cd分配比率分别为12.84%和13.78%,而"上海青"为28.22%和26.40%。综合而言,在2个Cd污染下,"四月"蔓对Cd的富集能力和向上转运能力更强,其吸收的Cd更多地分配于细胞壁中,进入细胞器的较少,且其生长受Cd污染影响较小,因此,在土壤Cd污染的植物修复中具有一定的应用潜力。
In order to explore the tolerance and detoxification mechanism of two varieties of Brasica chinensis L.（‘Siyueman＇and ‘Shanghaiqing＇）and their potential application in phytoremediation of Cd contaminated in soil,taking two varieties of Brasica chinensis L.（‘Siyueman＇and‘Shanghaiqing＇）as materials,soil pot experiment was used to manipulate soil Cd pollution and to investigate the effects of soil Cd pollution on growth,Cd accumulation and its subcellular distribution in Brasica chinensis L.The results showed that Cd pollution had little influence on the growth of variety ‘Siyueman＇but significantly inhibited the growth of variety‘Shanghaiqing＇（P〈0.05）.Under the two Cd levels,the Cd accumulations either in shoot or in the whole plant of variety‘Siyueman＇were significantly higher than those in variety‘Shanghaiqing＇（P〈0.05）.Furthermore,the enrichment coefficient and transfer coefficient in variety ‘Siyueman＇were greater than 1 and significantly higher than those in variety‘Shanghaiqing＇.In addition,the absorbed Cd in the two varieties was mainly accumulated in ectoderm.However,more Cd was distributed in ectoderm and fewer Cd was distributed in organelle in variety‘Siyueman＇compared with variety‘Shanghaiqing＇.Under the two Cd pollution levels,the distribution fraction rates of Cd in organelle of variety‘Siyueman＇were 12.84%,13.78% and 28.22%,26.40%,respectively.On the whole,the variety ‘Siyueman＇had a certain application potential in the phytoremediation of soil Cd pollution on account of its stronger abilities in absorbing and upward transporting Cd and lower Cd distribution fraction rate in organelle than those in variety‘Shanghaiqing＇.
出处
《北方园艺》
CAS
北大核心
2017年第22期6-11,共6页
Northern Horticulture
基金
河北省自然科学基金青年基金资助项目(C2014109013)
关键词
小青菜
CD
吸收累积
亚细胞
分布
Brasica ch inensis L.
cadmium
accumulatiomsubcellular
distribution
