苦荞低镉积累品种筛选及富集转运特征分析

以贵州省毕节市7个本地苦荞品种为供试对象,采用田间小区模式,研究受Cd污染的农用地上,不同品种苦荞植株对Cd的积累能力差异,探讨苦荞不同部位对Cd的富集转运能力,筛选出低Cd积累品种并分析其应用前景.结果 表明,(1)7个苦荞品种根部与籽粒两个部位Cd含量存在显著性差异,根部表现在黔苦4号(2.31 mg/kg)与黔苦...

Screening of Low Cadmium Accumulation Cultivars of Tartary Buckwheat and Analysis of the Characteristics of Bioconcentration and Transportation

In order to obtain low Cd accumulation buckwheat varieties suitable for Bijie area of Guizhou Province, an experiment was carried out in local fields. The accumulation ability of Cd in different buckwheat varieties under moderate Cd contamination was studied, the absorption and transport ability of Cd in different parts of buckwheat was studied, low Cd accumulation varieties were screened out and the application of buckwheat was analyzed. The results showed that, (1) There was a significant difference in Cd content between root and grain of 7 Tartary buckwheat varieties. The difference between root of Qianku 4 (2.31 mg/kg) and Qianku 6 (1.41 mg/kg) was significant, and the difference between grain of Qianku 2 (0.22 mg/kg) and Qianku 3 (0.12 mg/kg) was significant. (2) The enrichment ability of Cd in different parts of Tartary buckwheat was leaf>stem and root>glume>grain. Tartary buckwheat mainly accumulated Cd in root, stem and leaf, but the ability of Cd accumulation and transportation in grains was low. (3) The enrichment coefficient and transport coefficient of above ground part of 7 tartary buckwheat varieties were less than 1. The Cd concentration in grains of Qianheiku 1 and Qianku 3 was 0.12 mg/kg. The systematic cluster analysis of Cd accumulation in plants and grains of Tartary buckwheat classified them as low Cd accumulation varieties. (4) The selection of Tartary buckwheat varieties with low Cd accumulation is of great significance for the safe utilization of Cd-contaminated soil in Weining of Guizhou. The over-standard rate of Cd for 7 tested Tartary buckwheat varieties was 100%. The local authorities should pay attention to the problem of over-standard Cd of Tartary buckwheat varieties and strengthen the selection and breeding of varieties with low Cd accumulation that are suitable for planting in this region.