Recurrent Selection in Sorghum<sup>1</sup>

Doggett, H.; Eberhart, S. A.

doi:10.2135/cropsci1968.0011183x000800010038x

Cited by 44 publications

(36 citation statements)

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“…In this area of chromosome 4B, the frequency of the Probus allele decreased dramatically for four markers, in contrast with markers in adjacent regions (mean of allelic frequency differences between the initial and the evolved populations: 0.37 vs. 0.04, data not shown). This is in full agreement with the expected evolution of male-sterility gene ms1b, which was under stabilizing selection during population evolution (75% of sterile allele; Doggett and Eberhart 1968) and then selected against during fixation generations as ms1b/ms1b genotypes are sterile.…”

Section: Discussionsupporting

confidence: 87%

Efficiently Tracking Selection in a Multiparental Population: The Case of Earliness in Wheat

Thepot

Restoux

Goldringer³

et al. 2014

Genetics

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Multiparental populations are innovative tools for fine mapping large numbers of loci. Here we explored the application of a wheat Multiparent Advanced Generation Inter-Cross (MAGIC) population for QTL mapping. This population was created by 12 generations of free recombination among 60 founder lines, following modification of the mating system from strict selfing to strict outcrossing using the ms1b nuclear male sterility gene. Available parents and a subset of 380 SSD lines of the resulting MAGIC population were phenotyped for earliness and genotyped with the 9K i-Select SNP array and additional markers in candidate genes controlling heading date. We demonstrated that 12 generations of strict outcrossing rapidly and drastically reduced linkage disequilibrium to very low levels even at short map distances and also greatly reduced the population structure exhibited among the parents. We developed a Bayesian method, based on allelic frequency, to estimate the contribution of each parent in the evolved population. To detect loci under selection and estimate selective pressure, we also developed a new method comparing shifts in allelic frequency between the initial and the evolved populations due to both selection and genetic drift with expectations under drift only. This evolutionary approach allowed us to identify 26 genomic areas under selection. Using association tests between flowering time and polymorphisms, 6 of these genomic areas appeared to carry flowering time QTL, 1 of which corresponds to Ppd-D1, a major gene involved in the photoperiod sensitivity. Frequency shifts at 4 of 6 areas were consistent with earlier flowering of the evolved population relative to the initial population. The use of this new outcrossing wheat population, mixing numerous initial parental lines through multiple generations of panmixia, is discussed in terms of power to detect genes under selection and association mapping. Furthermore we provide new statistical methods for use in future analyses of multiparental populations.KEYWORDS QTL detection; parental contribution; recombinant population; selection detection; experimental evolution; multiparental populations; Multiparent Advanced Generation Inter-Cross (MAGIC); MPPA LTHOUGH the recent development of genome sequencing in crop species has strongly increased capacity for gene discovery, the accurate mapping of genes controlling the genetic variation of complex traits (QTL) remains a key objective. The principal mapping methods rely on the detection of statistical association between polymorphisms at molecular markers and quantitative variation of phenotypic traits and were historically developed for progenies of biparental crosses with parents chosen for their extreme phenotypes at a trait of interest. These populations are powerful resources for QTL detection, but have low precision as few effective meioses (and thus subsequent recombinations) occur during their development. As a result, large parental haplotype blocks are preserved in the segregating population. In a...

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Section: Discussionsupporting

confidence: 87%

Efficiently Tracking Selection in a Multiparental Population: The Case of Earliness in Wheat

Thepot

Restoux

Goldringer³

et al. 2014

Genetics

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“…There is a dominant, self-incompatibility suppressor gene, that conditions self-compatibility, causing almost complete self-fertility. Selffertility may be used in combination with genetic male sterility in population improvement programs based upon selfed-progeny performance and to develop inbred lines for hybrids (Bosemark 1971;Doggett and Eberhart 1968;Owen 1954).…”

mentioning

confidence: 99%

Broadening the genetic base of sugar beet: introgression from wild relatives

2006

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The development of sugar beet as an economically important field crop coincided with our increased understanding of modern genetic principles. It was developed in the late 1700s from white fodder beet; therefore, the genetic base of sugar beet is thought to be narrower than many open-pollinated crops. The wild sea beet is the progenitor of all domesticated beet and cross compatible with cultivated beet (domestic and cultivated are given subspecies level in the same species). The breeding system of sugar beet is complex and the crop is biennial, which lengthens the generation time to almost 1 year. A geneticcytoplasmic male sterility (CMS) system is utilized for commercial hybrid production. Early breeding objectives were to improve the concentration and extractability of sucrose and little emphasis was placed on host-plant resistance to insect, nematode, and disease pests. As production areas expanded, these pests limited production, sometimes severely. The first systematic L. Panella (

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“…The recurrent selection procedures are also suggested for often cross pollinated crops by considering cotton as an example (Miller and Rawlings, 1967) and in sorghum (Dogget and Eberhart, 1968) by utilizing male sterility system. Considering the success achieved in commercial exploitation of heterosis in cotton, sorghum, rice and such other often cross pollinated or self-pollinated crops, it is possible to visualize that such schemes of improving combining ability by following the recurrent selection schemes can be very well followed in these crops, with suitable modification in procedure in tune with the mating system of these crops (Patil and Patil, 2003).…”

Section: A Very New Methods To Develop Heterotic Groups Is Suggested Bmentioning

confidence: 99%

Concept of Heterotic Group and its Exploitation in Hybrid Breeding

Meena¹,

Gurjar²,

Patil³

et al. 2017

Int.J.Curr.Microbiol.App.Sci

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Recurrent Selection in Sorghum¹

Cited by 44 publications

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Efficiently Tracking Selection in a Multiparental Population: The Case of Earliness in Wheat

Efficiently Tracking Selection in a Multiparental Population: The Case of Earliness in Wheat

Broadening the genetic base of sugar beet: introgression from wild relatives

Concept of Heterotic Group and its Exploitation in Hybrid Breeding

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Recurrent Selection in Sorghum1

Cited by 44 publications

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Efficiently Tracking Selection in a Multiparental Population: The Case of Earliness in Wheat

Efficiently Tracking Selection in a Multiparental Population: The Case of Earliness in Wheat

Broadening the genetic base of sugar beet: introgression from wild relatives

Concept of Heterotic Group and its Exploitation in Hybrid Breeding

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Product

Resources

About

Recurrent Selection in Sorghum¹