Quantitative trait locus analysis for kernel width using maize recombinant inbred lines

Hui, Guoqiang; Wen, Guohong; Liu, X H; Yang, Huiqing; Luo, Qi; Song, Huifang; Wen, Liuying; Sun, Yu; Zhang, H M

doi:10.4238/2015.november.18.12

Cited by 1 publication

(2 citation statements)

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“…QTL for ear weight and kernel weight per ear co-mapped with the outlier loci in chromosome 3 (Yi et al 2019 ). QTL for ear diameter (Sabadin et al 2008 ), grain yield (Alves Lima et al 2006 ), hundred-kernel weight, kernel number per row (Chen et al 2016 ) and kernel width (Hui et al 2015 ; Chen et al 2016 ; Raihan et al 2016 ) co-mapped with the outlier in chromosome 5. QTL for grain yield per plant co-mapped with the outliers at 52.20 and 53.28 Mbp in chromosome 6 (Su et al 2017 ), while QTL for kernel width co-mapped with all outliers in chromosome 6 (Zhang et al 2014 ; Chen et al 2016 ) and the outlier at 135.91 Mbp in chromosome 10 (Hui et al 2015 ).…”

Section: Discussionmentioning

confidence: 99%

“…QTL for ear diameter (Sabadin et al 2008 ), grain yield (Alves Lima et al 2006 ), hundred-kernel weight, kernel number per row (Chen et al 2016 ) and kernel width (Hui et al 2015 ; Chen et al 2016 ; Raihan et al 2016 ) co-mapped with the outlier in chromosome 5. QTL for grain yield per plant co-mapped with the outliers at 52.20 and 53.28 Mbp in chromosome 6 (Su et al 2017 ), while QTL for kernel width co-mapped with all outliers in chromosome 6 (Zhang et al 2014 ; Chen et al 2016 ) and the outlier at 135.91 Mbp in chromosome 10 (Hui et al 2015 ). For the locus at 147.74 Mbp in chromosome 10 showing the strongest evidence for selection, co-locating QTL associated with ear length, kernel number per row (Huo et al 2016 ), cob and kernel length (Liu et al 2019 ), kernel volume, kernel weight (Zhang et al 2014 ), and kernel width (Hui et al 2015 ; Zhu et al 2018 ) were reported.…”

Section: Discussionmentioning

confidence: 99%

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Genetic diversity and selection signatures in maize landraces compared across 50 years of in situ and ex situ conservation

et al. 2021

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Genomics-based, longitudinal comparisons between ex situ and in situ agrobiodiversity conservation strategies can contribute to a better understanding of their underlying effects. However, landrace designations, ambiguous common names, and gaps in sampling information complicate the identification of matching ex situ and in situ seed lots. Here we report a 50-year longitudinal comparison of the genetic diversity of a set of 13 accessions from the state of Morelos, Mexico, conserved ex situ since 1967 and retrieved in situ from the same donor families in 2017. We interviewed farmer families who donated in situ landraces to understand their germplasm selection criteria. Samples were genotyped by sequencing, producing 74,739 SNPs. Comparing the two sample groups, we show that ex situ and in situ genome-wide diversity was similar. In situ samples had 3.1% fewer SNPs and lower pairwise genetic distances (Fst 0.008–0.113) than ex situ samples (Fst 0.031–0.128), but displayed the same heterozygosity. Despite genome-wide similarities across samples, we could identify several loci under selection when comparing in situ and ex situ seed lots, suggesting ongoing evolution in farmer fields. Eight loci in chromosomes 3, 5, 6, and 10 showed evidence of selection in situ that could be related with farmers’ selection criteria surveyed with focus groups and interviews at the sampling site in 2017, including wider kernels and larger ear size. Our results have implications for ex situ collection resampling strategies and the in situ conservation of threatened landraces.

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