While approximately 60% of the value of soybean comes from its meal, the remaining 40% comes from its oil (Pettersson and Pontoppidan 2013), therefore, the total content of protein and oil in soybean seed is more important than just its protein or oil content. Oil and soybean meal are the two main economical components of soybean (Warrington et al. Soybean is considered a unique leguminous crop, because its seed is a rich source of protein, essential amino acids, oil, and metabolizable energy (Supplementary Table 1). Finally, we discuss comprehensive approaches for integrating protein and amino acid QTL, genome-wide association studies, whole-genome resequencing, and transcriptome data to accelerate identification of genomic hot spots for allele introgression and soybean meal protein improvement.Ī major portion of human, poultry, and livestock diets around the globe is derived from cereals and legumes (Mandal and Mandal 2000). In addition, we describe advances in next-generation sequencing technologies for precise detection of natural variants and their integration with conventional and high-throughput genotyping technologies. In this review, we discuss rate-limiting factors related to soybean protein content and nutritional quality, and potential control factors regulating seed storage protein. However, practical breeding progress is challenging because of seed protein content’s negative genetic correlation with seed yield, other seed components such as oil and sucrose, and interaction with environmental effects such as temperature during seed development. Genetic improvement of soybean seed protein content is highly desirable, and major quantitative trait loci (QTL) for soybean protein have been detected and repeatedly mapped on chromosomes (Chr.) 20 ( LG- I), and 15 ( LG- E). Protein is a key factor that determines the nutritional and economical value of soybean. Meal protein derived from soybean seed is the primary source of protein in poultry and livestock feed. This review describes the progress in mapping and genomics, identifies knowledge gaps, and highlights the need of integrated approaches. Genetic improvement of soybean protein meal is a complex process because of negative correlation with oil, yield, and temperature.
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