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Assessing diversity in Triticum durum cultivars and breeding lines for high versus low cadmium content in seeds using the CAPS marker usw47

机译:利用CAPS标记usw47评估硬粒小麦品种和育种系中种子中镉含量高低的多样性

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摘要

Cadmium (Cd) is a toxic heavy metal that occurs naturally in soils. Durum wheat is known to accumulate generally more Cd than other cereal crops. The uptake of Cd in durum wheat is governed by the gene Cdu1, which co-segregates with several DNA markers, such as the co-dominant marker usw47 and the dominant marker ScOPC20. A panel of 314 durum wheat cultivars or lines originating from 16 countries or regions were assessed with usw47. The plant material was mainly comprised of cultivars and modern breeding lines. From this set, 165 durum wheat lines were classified as low-Cd accumulators, 144 high-Cd accumulators and five were heterogeneous. A smaller subset of 16 cultivars had previously been evaluated for Cd accumulation in replicated field trials. Lines with the high-Cd allele showed a 2.4-fold higher Cd content in the seeds than lines with the low-Cd allele. We also compared the utility of markers usw47 and ScOPC20 as selection tools. Marker-assisted selection appears as a robust and practicable tool for breeding durum cultivars with low-Cd content.
机译:镉(Cd)是一种有毒的重金属,自然存在于土壤中。众所周知,硬粒小麦通常比其他谷物作物积累更多的镉。硬粒小麦对Cd的吸收受Cdu1基因控制,该基因与几种DNA标记(例如共同标记usw47和主要标记ScOPC20)共同分离。用usw47评估了来自16个国家或地区的314种硬质小麦品种或品系。植物材料主要由栽培品种和现代育种系组成。从该组中,将165硬质小麦品种归为低镉蓄积者,有144个高镉蓄积者为五种,并且是异质的。先前已经在重复的田间试验中评估了16个品种的较小子集的Cd积累。高Cd等位基因系的种子中Cd含量比低Cd等位基因系高2.4倍。我们还比较了标记usw47和ScOPC20作为选择工具的效用。标记辅助选择似乎是育种低Cd硬质合金品种的强大而实用的工具。

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