Reference Report for RTN20220629.1
| Title: | Identification of quantitative trait loci for carbon isotope ratio (13C) in a recombinant inbred population of soybean |
| Authors: | Bazzer, S., Kaler, A.S., Ray, J.D., Smith, J.R., Fritschi, F.B., Purcell, L.C. |
| Source: | Bazzer et al. Theoretical and Applied Genetics (2020) 133:2141–2155 |
| Abstract: | Drought is a major limitation to soybean yield, and the frequency of drought stress is likely to increase underfuture climatic scenarios. Water use efficiency (WUE) is associated with drought tolerance, and carbon isotope ratio (13C)is positively correlated with WUE. In this study, 196 F6-derived recombinant inbred lines from a cross of PI 416997 (highWUE) PI 567201D (low WUE) were evaluated in four environments to identify genomic regions associated with 13C.There were positive correlations of 13C values between different environments (0.67 r 0.78). Genotype, environment,and genotype environment interactions had significant effects on 13C. Narrow sense heritability of 13C was 90% whenestimated across environments. There was a total of 16 QTLs on seven chromosomes with individual QTLs explainingbetween 2.5 and 29.9% of the phenotypic variation and with additive effects ranging from 0.07 to 0.22. These 16 QTLslikely identified eight loci based on their overlapping confidence intervals. Of these eight loci, two loci on chromosome 20(Gm20) were detected in at least three environments and were considered as stable QTLs. Additive QTLs on Gm20 showedepistatic interactions with 10 QTLs present across nine chromosomes. Five QTLs were identified across environments andshowed significant QTL environment interactions. These findings demonstrate that additive QTLs and QTL QTL interactionsplay significant roles in genetic control of the 13C trait. Markers flanking identified QTL |
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