关键词: 苎麻, 镉积累量, 富集系数, 转运系数, 镉富集能力

Abstract: Ramie is one of the important fiber crops in China, and it is a promising plant for repairing the heavy metals. In order to evaluate the cadmium accumulation ability of ramie, 269 ramie germplasm resources under the cadmium-polluted field were studied. The results showed that there were significant differences in cadmium accumulation, enrichment coefficient and transport coefficient in these ramie germplasm resources, and the coefficient of variation were 31.10%, 20.19% and 19.59 %, respectively. The distribution  of cadmium accumulation in various organs of 57.25% ramie germplasm was radish root > reproductive root > leaf > stick > fiber > steam bark. The cadmium accumulation in reproductive root of 37.17% germplasm was significantly higher than that of radish root, and 4.46% of ramie germplasm showed inconsistent distribution. The cluster analysis roughly revealed 4 groups including 7, 76, 139 and 47 accessions in group Ⅰ～Ⅳ, respectively. The germplasm resources in group Ⅰ contained the highest cadmium accumulation. The membership function method was used to comprehensively evaluate the indicators of cadmium accumulation ability, and 18 germplasms with high cadmium accumulation ability were selected. They were Ponian qingyezhu 2, Changsha zhuma, Yangliuba zuodouma, Xiangtan zhugenjiama, Qidong zhuma 2, Nanpo honghuadianqianzhu, Pojie dianqianzhu, Leye huilyuzhu, Longhui bendima, Liuyang zhuma 2, Qibaoshan zhuma 2, Muyu zhuma 1, Dayong huangkema, Nanpo xiejizhu, Chuanzhu 1, Chima, 74-69 and Pokou zhuma. The average cadmium accumulation was 657.55 μg·plant-1, the range was 436.60~942.91 μg·plant-1. The average enrichment coefficient was 1.10, and the average transport coefficient was 0.93. Above results provided theological basis for selecting the high cadmium accumulation ability ramie germplasm and reference for repairing cadmium-polluted field.

Key words: ramie, cadmium accumulation, enrichment coefficient, transport coefficient, cadmium accumulation ability