Frequency of the transposable element<i>Uq</i>in Iowa stiff stalk synthetic maize populations

Lamkey, Kendall R.; Petérson, Peter A.; Hallauer, Arnel R.

doi:10.1017/s0016672300028962

Cited by 34 publications

(27 citation statements)

References 24 publications

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“…Both of the populations for which parameter estimates are available, BS13(S)C0 and BSCB1( R )C13, were selected for grain yield and grain moisture with a greater emphasis placed on grain yield. BS13(S)C0 was initially put through 7 cycles of half‐sib selection, and BSCB1( R )C13 has undergone 13 cycles of reciprocal improvement with the BSSS(R) population (Penny and Eberhart, 1971; Lamkey et al, 1991; Keeratinijakel and Lamkey, 1993; Schnicker and Lamkey, 1993; Holthaus and Lamkey, 1995). Given observed covariance parameter estimates for grain yield in these two popluations, it appears that selection has produced similar genotypic covariance structures in two populations that differ in their genetic background.…”

Section: Discussionmentioning

confidence: 99%

The Genetic Structure of a Maize Population: The Role of Dominance

Wardyn¹,

Edwards

Lamkey³

2007

Crop Science

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The combined effects of dominance and inbreeding on covariances between relatives are still poorly understood in maize (Zea mays L.) populations. Our objectives were to address the following questions: (i) What is the importance of dominance in a maize synthetic? (ii) How does inbreeding affect the genetic variance among individuals in a maize synthetic. (iii) How do the covariance parameters compare between populations? (iv) How does breeding design impact estimators? We estimated covariance components for inbred relatives in the maize synthetic BSCB1(R)C13. Previous estimates of covariance parameters have been used to explain the ineffectiveness of inbred progeny selection in the stiff‐stalk population BS13. We found that the dominance variance was larger than the additive variance for grain yield, whereas the additive variance was larger than the dominance variance for all other traits. Negative estimates of the covariance between additive and homozygous dominance deviations were found for all traits with the exception of traits associated with reproductive maturity, suggesting a negative relationship between inbred and outbred performance. The correlation between genotypic values and breeding values was lower for grain yield than for any other trait. Our results were similar to previous results found in the stiff‐stalk maize population BS13, suggesting similarity in structure among populations.

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Section: Discussionmentioning

confidence: 99%

The Genetic Structure of a Maize Population: The Role of Dominance

Wardyn¹,

Edwards

Lamkey³

2007

Crop Science

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“…Within 63 four years, however, more than 90% of maize grown in Iowa had transitioned to higher-yielding 64 hybrids created by controlled crosses, and the rest of the Corn Belt soon followed (Reif et al 65 2005). The transition to single-cross hybrids was largely driven by key founder lines (B14, B37, 66 and B73) derived from a pivotal maize population called Iowa Stiff Stalk Synthetic (BSSS), 67 which was created in the 1930s by intermating 16 inbred lines (Lamkey et al 1991;Reif et al 68 2005). These founder lines and their combinations, referred to as Stiff Stalk lines, became 69 preferentially used as females in hybrid breeding schemes, while other inbred lines that 70 combined well with them were used as males (Reif et al 2005).…”

Section: Introduction 29mentioning

confidence: 99%

Selection signatures underlying dramatic male inflorescence transformation during modern hybrid maize breeding

Gage

White

Edwards

et al. 2018

Preprint

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9Inflorescence capacity plays a crucial role in reproductive fitness in plants, and in 10 production of hybrid crops. Maize is a monoecious species bearing separate male and female 11 flowers (tassel and ear, respectively). The switch from open-pollinated populations of maize to 12 hybrid-based breeding schemes in the early 20 th century was accompanied by a dramatic 13 reduction in tassel size, and the trend has continued with modern breeding over the recent 14 decades. The goal of this study was to identify selection signatures in genes that may underlie 15 this dramatic transformation. Using a population of 942 diverse inbred maize accessions and a 16 nested association mapping population comprised of three 200-line biparental populations, we 17 measured 15 tassel morphological characteristics by manual and image-based methods. 18Genome-wide association studies identified 242 single nucleotide polymorphisms significantly 19 associated with measured traits. We compared 41 unselected lines from the Iowa Stiff Stalk 20 Synthetic (BSSS) population to 21 highly selected lines developed by modern commercial 21 breeding programs and show that tassel size and weight were reduced significantly. We assayed 22 genetic differences between the two groups using selection statistics XP-EHH, XP-CLR, and 23 2 F ST . All three selection statistics show evidence of selection at genomic regions associated with 24 tassel morphology relative to genome-wide null distributions. These results support the 25 tremendous effect, both phenotypic and genotypic, that selection has had on maize male 26 inflorescence morphology. 27 28 contained in each of the populations, phenotypic variability within the PHW65 NAM is lower 132 than in the WiDiv-942, with the exception of TW (standard deviation 0.3 grams greater) and 133BNp (standard deviation 0.07 branches greater). 134Heritabilities for manually measured traits ranged from 0.93 (BZ) to 0.97 (BN) in the 135 WiDiv-942 and from 0.79 (BZ) to 0.94 (BN) in the PHW65 NAM. Since images and TW were 136 taken only at one location, repeatability was calculated for image-based traits and TW in place of 137 heritability. Repeatabilities ranged from 0.72 (PR) to 0.86 (TWp) in the WiDiv-942 and 0.63 138

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“…Exemplifying this importance, in 1980, 19% of all parental materials of hybrids in the United States were inbred lines extracted from a single population, the Iowa Stiff Stalk Synthetic (BSSS), one of the most frequently used germplasms in the world (LAMKEY et al, 1991). In a more recent plan, Mikel (2011) studied the genetic compositions of more than 300 inbreds with registered pedigrees in the United States between 2004 and 2008 and from various private breeding programs from the US and concluded that just two germoplasms, the BSSS and Iodent, together contributed with more than two-thirds of the genes in these inbred lines.…”

Section: Introductionmentioning

confidence: 99%

Combining abilities and inbreeding depression in commercial maize hybrids

et al. 2015

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The objective of this study was to evaluate the combining ability and inbreeding depression of commercial maize hybrids for agricultural traits. Twenty-two commercial maize hybrids, 96 F 1 crosses from a partial diallel scheme, 22 S 1 populations and 4 controls were evaluated in a 12x12 simples square lattice experimental setup, totaling 144 treatments, in the municipality of Sabáudia (PR), Brazil, for harvests from 2011/2012 and 2012/2013. Three traits were evaluated: grain yield, plant height and ear height. The Griffing method (1956) was applied for the evaluation of the general combining ability (GCA) and specific combining ability (SCA). The 30B39, 30K64 and 30B30 hybrids showed increased yield, 30F53 and P1630 showed reduced plant height and AG9040 and AG7010 showed reduced ear height. These hybrids can be recommended for the extraction of inbred lines and formation of composites followed by intrapopulation selection. The combinations 30B39 x AG8088, 30B39 x AG9045 and P1630 x AG8021 showed desirable SCA effects for grain yield, plant height and ear height and are recommended for use in reciprocal recurrent selection programs. High magnitudes of inbreeding depression were verified for yield and lower values for inbreeding depression for plant and ear heights. Thus, strategies are recommended for interpopulation breeding accompanied by inbred lines extraction.

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Frequency of the transposable elementUqin Iowa stiff stalk synthetic maize populations

Cited by 34 publications

References 24 publications

The Genetic Structure of a Maize Population: The Role of Dominance

The Genetic Structure of a Maize Population: The Role of Dominance

Selection signatures underlying dramatic male inflorescence transformation during modern hybrid maize breeding

Combining abilities and inbreeding depression in commercial maize hybrids

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