对湘潭锰矿业废弃地土壤重金属含量、自然定居的草本植物对重金属吸收与转移特征进行了研究.结果表明:土壤重金属含量较高,其中Zn、Cd、Pb的含量超过国家土壤环境质量标准(GB15618-1995)的3级标准,是一类被重金属复合污染的土壤;自然定居的草本植物对重金属的吸收表现为富集型植物(如商陆P hy tolacca acinosa)、根部囤积型植物(如野茼蒿C rassocepha lumcrep id ioid es)、规避型植物(如灯心草M edu lla J unci)等3种类型.研究结果为寻找和发现适合当地气候条件与土壤条件的重金属耐性植物提供科学依据.
In this study,tetraploid of oil camellia (Camellia oleifera) was identified from the superior clones which were treated with colchicine,and the tetraploid variation was investigated with the experimental material. Ana...
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In this study,tetraploid of oil camellia (Camellia oleifera) was identified from the superior clones which were treated with colchicine,and the tetraploid variation was investigated with the experimental material. Analysis of the number of chromosome showed the chromosome number of the tetraploid oil camellia was 2n=4x=60,compared with the diploid (2n=2x=30). The morphological observation showed that the leaf area,leaf length,leaf width,leaf thickness and the space of leaf in the tetraploid were respectively increased by 9.8%,38.5%,25%,48.25%,67%,compared with the diploid. The chlorophyll content and the length and width of guard cells were respectively increased by 47.87%,48.15% and 37.26%,while the leaf-shape index reduced 38.1% than that in the control group. In addition,the leaf of tetraploid plant became more round,the total DNA content was twice as the control group was,and the net photosynthetic rate was also greater than that of the control group. The genetic polymorphism analysis with the mtDNA and cpDNA primers showed that no polymorphic locus was found in the tetraploid,which meant that the tetraploid was autotetraploid,however the genetic polymorphism analysis in the nDNA exhibited that the polymorphic ratio was 51%.
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