不同品种小麦Pb积累差异性研究

    Differences in Pb Accumulation Between Wheat Varieties

    • 摘要: 通过在轻度污染耕地的田间试验,研究了20 个小麦品种对重金属Pb 的吸收差异,并探讨小麦对Pb 的转运与富集规律,以期筛选出对Pb 低积累小麦品种。对小麦籽粒重金属Pb 含量的聚类分析表明花培8 号、平安8号、周麦20、豫农201 和同舟麦916 具有低积累特性。上述5 个品种籽粒中Pb 含量均符合GB 2715—2005《粮食卫生标准》,Pb 从根部向籽粒的平均转运系数(0. 001 1)和富集系数(0. 037 4)均小于1,且各品种产量均较高。研究初步认为花培8 号和周麦20 具有成为低积累特性品种的潜力,经进一步验证后可用于轻度污染耕地的种植生产。

       

      Abstract: A field trial was conducted in a piece of farmland mildly contaminated with heavy metals, to study differences in Pb uptake between 20 different wheat varieties, and to explore rules of Pb transfer and accumulation in wheat, in the hope of screening out low-Pb-accumulating wheat cultivars. Cluster analysis based on Pb content in grains shows that Huapei 8, Pingan 8, Zhoumai 20, Yunong 201 and Tongzhoumai 916 were low in Pb accumulation, and Pb contents in grains of these five wheat cultivars complied with the criteria of Hygiene Standard for Grains (GB 2715-2005). Their mean transfer factor of Pb from roots to grains was 0.0011 and Pb enrichment factor 0.0374, both below 1. Moreover, these cultivars of wheat were quite high in yield. It is, therefore, tentatively held that Huapei 8 and Zhoumai 20 are two potential cultivars featuring low Pb-accumulation. Before being extrapolated for cultivation in farmlands mildly polluted with Pb, further studies should be done to verify their low Pb accumulating traits.

       

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