Robert W. Holley Center for Agriculture and Health, USDA-ARS, Cornell University, Ithaca, NY 14853, USA; Department of Plant Breeding and Genetics, Cornell University, Ithaca, NY 14853, USA; Soil Science Department at Federal University of Lavras, P.O. Box 3037, 37200-000 Lavras, MG, Brazil.
Robert W. Holley Center for Agriculture and Health, USDA-ARS, Cornell University, Ithaca, NY 14853, USA.
Plant Sci. 2014 Jul;224:27-35. doi: 10.1016/j.plantsci.2014.03.022. Epub 2014 Apr 6.
Exploration of genetic resources for micronutrient concentrations facilitates the breeding of nutrient-dense crops, which is increasingly seen as an additional, sustainable strategy to combat global micronutrient deficiency. In this work, we evaluated genotypic variation in grain nutrient concentrations of 20 Brazil wheat (Triticum aestivum L.) accessions in response to zinc (Zn) and Zn plus selenium (Se) treatment. Zn and Se concentrations in grains exhibited 2- and 1.5-fold difference, respectively, between these wheat accessions. A variation of up to 3-fold enhancement of grain Zn concentration was observed when additionally Zn was supplied, indicating a wide range capacity of the wheat lines in accumulating Zn in grains. Moreover, grain Zn concentration was further enhanced in some lines following supply of Zn plus Se, showing stimulative effect by Se and the feasibility of simultaneous biofortification of Zn and Se in grains of some wheat lines. In addition, Se supply with Zn improved the accumulation of another important micronutrient, iron (Fe), in grains of half of these wheat lines, suggesting a beneficial role of simultaneous biofortification of Zn with Se. The significant diversity in these wheat accessions offers genetic potential for developing cultivars with better ability to accumulate important micronutrients in grains.
探索微量营养素浓度的遗传资源有助于培育营养密集型作物，这被越来越多地视为应对全球微量营养素缺乏的另一种可持续策略。在这项工作中，我们评估了 20 个巴西小麦（Triticum aestivum L.）品种的籽粒养分浓度的基因型变异，这些品种对锌（Zn）和锌加硒（Se）处理的响应。这些小麦品种的籽粒中 Zn 和 Se 的浓度分别相差 2 倍和 1.5 倍。当额外供应 Zn 时，观察到籽粒 Zn 浓度的变化高达 3 倍，表明小麦品系在积累 Zn 方面的能力范围很广。此外，在供应 Zn 加 Se 后，一些品系的籽粒 Zn 浓度进一步提高，表明 Se 具有刺激作用，并且在一些小麦品系的籽粒中同时生物强化 Zn 和 Se 是可行的。此外，Zn 供应 Se 提高了这些小麦品系中一半的籽粒中另一种重要微量元素铁（Fe）的积累，表明 Zn 与 Se 同时生物强化具有有益作用。这些小麦品种的显著多样性为开发具有更好的能力在籽粒中积累重要微量营养素的品种提供了遗传潜力。
