NAM population – a novel genetic resource for soybean improvement: development and characterization for yield and attributing traits

Abstract

Nested association mapping (NAM) captures the best features of both linkage and association mapping and enables the high power and high resolution of quantitative trait locus mapping through joint linkage-association analysis. In the current study, NAM population was developed by hybridizing JS 335, a popular variety of central India with 20 diverse soybean genotypes. The parents used in the study have various traits of economic importance such as drought and water-logging tolerance, bacterial pustule and yellow mosaic virus resistance, wider adaptability, resistance to mechanical damage and higher yield potential. High variability in the F2 populations of 20 crosses for grain yield and days to maturity indicated scope for development of high-yielding varieties. Genetic variability studies, correlation, regression, principal component analysis (PCA) and genetic diversity analyses were carried out in 900 NAM-recombinant inbred lines (RILs) derived from 11 crosses. Correlation and regression analysis indicated a significant positive effect of biomass, pods/plant, harvest index, branches/plant, nodes/plant and plant height on grain yield. Genetic diversity analysis grouped 900 NAM-RILs into 10 clusters. PCA revealed first two principal components to explain 63.78% of total variation mostly contributed by grain yield, biomass and number of pods. The inbred lines developed in this study will serve as an elite soybean genetic resource in understanding the genetic architecture underlying different traits of economic significance.

Preparation of Edible Non-wettable Coating with Soybean Wax for Repelling Liquid Foods with Little Residue

“…Soybean wax is made from natural soybeans, which are abundant. Thus, the soybean wax is cheap, natural and biodegradable without environmental pollution, which has great advantages in terms of health and environmental protection [ 26 , 27 ]. The main ingredient of soybean wax is triacylglyceride composed of stearic acid.…”

Molecular characterization of QTL-allele system for drought tolerance at seedling stage and optimal genotype design using multi-locus multi-allele genome-wide association analysis in a half-sib population of soybean (Glycine max (L.) Merr.)

“…The linkage mapping (LM) based on bi-parental crossing although quite popular in identifying large effect genetic regions for DT yet limited owing to relatively small phenotypic variation prevalent in the bi-parental populations as only two alleles per locus can be detected simultaneously. To overcome the limitations of LM populations, association mapping (AM) is utilized for mapping of complex traits with higher resolution (Maranna et al ., 2019). However, resolution of quantitative trait locus (QTL) mapping in AM is greatly influenced by a number of factors such as selection, migration, genetic drift and linkage disequilibrium (LD) decay (Maranna et al ., 2019).…”

“…To overcome the limitations of LM populations, association mapping (AM) is utilized for mapping of complex traits with higher resolution (Maranna et al ., 2019). However, resolution of quantitative trait locus (QTL) mapping in AM is greatly influenced by a number of factors such as selection, migration, genetic drift and linkage disequilibrium (LD) decay (Maranna et al ., 2019). Eventually, to overcome the shortfalls of LM and AM, multi-parent mapping populations such as nested association mapping (NAM) has emerged as a promising mapping design for handling complex genetic traits (Li et al ., 2011).…”