인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
DBpia AI
AI 에이전트
AI 아이디어
AI 리더
AI 뷰어
Citeasy
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지원사업
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커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
Guinea grass (Megathyrsus maximus) is a common tropical forage crop valued for its high biomass yields, nutritional quality, and adaptability to diverse abiotic stresses. However, the genetic basis of its key agronomic traits remains poorly understood. In this study, we conducted genome-wide association studies (GWAS) using whole genome sequencing (WGS) data from 124 diverse M. maximus genebank accessions, yielding a high-density single-nucleotide polymorphism (SNP) data set of 1,261,156 SNPs after mapping to a related reference genome. Population structure analysis revealed three major genetic subgroups within the collection. Using three complementary GWAS models (Bayesian-information and Linkage-disequilibrium Iteratively Incorporating Knowledge (BLINK), the Fixed and Random Model Circulating Polynomial Unification (FarmCPU), and the Multiple Loci Mixed Model (MLMM)), we identified 25 significant marker-trait associations (MTAs) spanning three major trait categories: (i) phenological and plant-architecture; (ii) nutritional and digestibility; and (iii) productivity and nitrogen-use traits, evaluated under wet-season, dry-season, and greenhouse conditions. Several MTAs were associated with genes related to plant growth and development, lignin biosynthesis, and nitrogen-cycling (including nitrogen uptake and biological nitrification inhibition). Notably, two SNPs were pleiotropic, with one associated with both nitrogen uptake and shoot biomass production, and another shared between crude protein and in vitro dry matter digestibility. Although a complete reference genome is not yet available for M. maximus, our results provide valuable information for future marker validation and breeding. This study highlights the potential of GWAS as a powerful tool for trait dissection and genetic improvement in tropical forage crops. The research represents a step forward in developing more resilient and productive M. maximus cultivars.
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오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
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