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首页> 外文期刊>Ecotoxicology >Classification of genetic variation for cadmium tolerance in Bermudagrass [Cynodon dactylon (L.) Pers.] using physiological traits and molecular markers
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Classification of genetic variation for cadmium tolerance in Bermudagrass [Cynodon dactylon (L.) Pers.] using physiological traits and molecular markers

机译：利用生理性状和分子标记对百慕大草（Cynodon dactylon（L.）Pers。）的镉耐受性遗传变异进行分类

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Cadmium (Cd) is one of the most toxic pollutants that caused severe threats to animal and human health. Bermudagrass is a dominant species in Cd contaminated soils, which can prevent Cd flow and spread. The objectives of this study were to determine the genetic variations in major physiological traits related to Cd tolerance in six populations of Bermudagrass collected from China, and to examine the genetic diversity and relationships among these accessions that vary in Cd tolerance using molecular markers. Plants of 120 accessions (116 natural accessions and 4 commercial cultivars) were exposed to 0 (i.e. control) or 1.5 mM CdSO4·8/3H2O for 3 weeks in hydroponic culture. Turf quality, transpiration rate, chlorophyll content, leaf water content and growth rate showed wide phenotypic variation. The membership function method was used to comprehensively evaluate Cd-tolerance. According to the average subordinate function value, four accessions were classified as the most tolerant genotypes and four accessions as Cd-sensitive genotypes. The trend of Cd tolerance among the six studied populations was as follows: Hunan South China North China Central China West South China and Xinjiang population. Phylogenetic analysis revealed that the majority of accessions from the same or adjacent regions were clustered into the same groups or subgroups, and the accessions with similar cadmium tolerance displayed a close phylogenetic relationship. Screening genetically diverse germplasm by combining the physiological traits and molecular markers could prove useful in developing Cd-tolerant Bermudagrass for the remediation of mill tailings and heavy metal polluted soils.
机译：镉（Cd）是最有毒的污染物之一，对动物和人类健康造成了严重威胁。百慕大草是受Cd污染的土壤中的优势种，可以阻止Cd的流动和扩散。这项研究的目的是确定从中国收集的六个百慕大百慕大种群中与Cd耐性有关的主要生理性状的遗传变异，并使用分子标记检查Cd耐性变化的这些种质的遗传多样性和关系。在水培条件下，将120个种质的植物（116个自然种质和4个商业品种）暴露于0（即对照）或1.5 mM CdSO4·8 / 3H2O中3周。草坪品质，蒸腾速率，叶绿素含量，叶片含水量和生长速率表现出较大的表型变异。隶属度函数方法用于全面评估Cd耐受性。根据平均下属功能值，将四个种质分类为最耐受的基因型，将四个种质分类为对Cd敏感的基因型。在这六个研究人群中，对Cd的耐受性趋势如下：湖南>华南>华北>华中>华南西部和新疆人口。系统发育分析表明，来自相同或相邻区域的大部分种质聚集成相同的组或亚组，并且具有相似的镉耐受性的种质表现出密切的系统发育关系。结合生理特性和分子标记筛选遗传多样性的种质，可用于开发对镉具有耐受性的百慕大草，以修复工厂尾矿和重金​​属污染的土壤。

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