Abstract
Although addition of selenium (Se) is known to increase Se in crops, it is unclear whether exogenous Se is linked to nutritional and functional components in foxtail millet (Setaria italica L.). In this study, we examined the potential of increasing Se and yellow pigment (YP) in foxtail millet grain by foliar application of Se. Field experiments were conducted during the growing season of foxtail millet in 2013 and 2014 to assess the effects of foliar spray of sodium selenite (10–210 g Se ha−1) on the yield, Se uptake and accumulation, total YP, and microminerals in the grain. Average grain yields with Se application were 5.60 and 4.53 t ha−1 in the 2 years, showing no significant differences from the unfertilized control. However, grain Se concentration increased linearly with Se application rate, by 8.92 and 6.09 μg kg−1 in the 2 years with application of 1 g Se ha−1 (maximum grain recovery rates of Se fertilizer, 52 and 28 %). Likewise, total grain YP concentration markedly increased by 0.038 and 0.031 mg kg−1 in the 2 years with application of 1 g Se ha−1. Grain Mn, Cu, Fe, and Zn concentrations were not significantly affected by Se application. This study indicated that foliar application of Se effectively and reliably increased the concentrations of Se and YP in foxtail millet grain without affecting the yield or mineral micronutrient concentrations. Thus, foliar-applied selenite has a significant potential to increase the concentrations of selenium and YP (putative lutein (Shen, J Cereal Sci 61:86–93, 2015; Abdel-Aal, Cereal Chem 79:455–457, 2002; Abdel-Aal, J Agric Food Chem 55:787–794, 2007)) of foxtail millet and, thus, the health benefits of this crop.
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Acknowledgments
The authors gratefully acknowledge the funding from the National Key Technology R&D Program (2014BAD07B01), the National Natural Science Foundation of China (31301269), the Scientific and Technological Project in Shanxi Province, China (20120311004-4), and the Graduate Innovative Research Project in Shanxi Province, China (20143053).
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Ning, N., Yuan, XY., Dong, SQ. et al. Increasing Selenium and Yellow Pigment Concentrations in Foxtail Millet (Setaria italica L.) Grain with Foliar Application of Selenite. Biol Trace Elem Res 170, 245–252 (2016). https://doi.org/10.1007/s12011-015-0440-2
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DOI: https://doi.org/10.1007/s12011-015-0440-2