Long‐Term Selection in a Commercial Hybrid Maize Breeding Program

Duvick, Donald N.; Smith, J. S.; Cooper, Mark

doi:10.1002/9780470650288.ch4

Cited by 262 publications

(470 citation statements)

References 10 publications

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“…Tassel features, as tassel size, were being reduced in commercial hybrids (DUVICK et al, 2010). The main factor contributing to breeding programs selecting to a smaller size tassel is justified by HALLAUER et al (2010), where the mass is directly related to the tassel size, negatively affecting grain production, by the competition for nutrients with the cob.…”

Section: Resultsmentioning

confidence: 97%

Association of secondary traits with yield in maize F 1 's

et al. 2016

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Section: Resultsmentioning

confidence: 97%

Association of secondary traits with yield in maize F 1 's

et al. 2016

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“…Anthesis-silking interval (ASI) became shorter with more recent decade of release in three experiments comparing maize cultivars adapted to the US Corn Belt (Meghji et al, 1984;Russell, 1985;Duvick et al, 2004), and this trend was greater in trials grown at higher plant densities (Duvick et al, 2004). Another trait directly associated with response to density is ears per plant.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, increases in plant density were accompanied by the introduction of maize genotypes that could withstand higher densities and achieve higher yields per unit area. For example, several examinations of US hybrids showed that open pollinated cultivars and old hybrids provided their highest yields at the lower densities typical of their era, whereas the newest hybrids yielded most at the higher densities typical of recent years (Russell, 1991;Duvick et al, 2004). Hybrids usually gave the highest yield when grown at the density for which they were bred.…”

Section: Introductionmentioning

confidence: 99%

Direct mapping of density response in a population of B73 × Mo17 recombinant inbred lines of maize (Zea Mays L.)

et al. 2009

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Maize yield per unit area has dramatically increased over time as have plant population densities, but the genetic basis for plant response to density is unknown as is its stability over environments. To elucidate the genetic basis of plant response to density in maize, we mapped QTL for plant density-related traits in a population of 186 recombinant inbred lines (RILs) derived from the cross of inbred lines B73 and Mo17. All RILs were evaluated for growth, development, and yield traits at moderate (50 000 plants per hectare) and high (100 000 plants per hectare) plant densities. The results show that genetic control of the traits evaluated is multigenic in their response to density. Five of the seven loci significant for final height showed statistical evidence for epistatic interactions. Other traits such as days to anthesis, anthesis-to-silking interval, barrenness, ears per plant, and yield per plant all showed statistical evidence for an epistatic interaction. Locus by density interactions are of critical importance for anthesis-to-silking interval, barrenness, and ears per plant. A second independent experiment to examine the stability of QTL for barrenness in a new environment clearly showed that the multilocus QTL were stable across environments in their differential response to density. In this verification experiment, the four-locus QTL was used to choose lines with the four unfavorable alleles and compare them with the lines with four favorable alleles and the effect was confirmed.

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“…Analysis of field corn breeding over the past 80 years proves the success of this method. A well-known series of experiments, known as the "Era hybrid studies", demonstrates the continuous gain in yield among field corn hybrids in Iowa from the early 1930s through 2001 [14][15][16]. Comparisons of hybrids by decade show a linear increase in yield gains among field corn hybrids by era, with the newest hybrids producing the highest yields.…”

Section: Introductionmentioning

confidence: 99%

Genetic Variation and Phenotypic Response of 15 Sweet Corn (Zea mays L.) Hybrids to Population Density

Shelton

Tracy

2013

Sustainability

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Abstract:Planting sweet corn at higher densities may increase the canopy cover, reducing light transmission to the understory and suppressing weed growth. High planting densities can also negatively impact the crop, however, by decreasing ear size and overall yield. The objective of this study was to determine the potential for increased density tolerance of 15 sweet corn hybrids by estimating the general combining ability (GCA) and specific combining ability (SCA) for traits of interest. In 2010 and 2011, a half-diallel of six historic sweet corn inbreds was evaluated in a split-block randomized complete block design in four Wisconsin environments, with four replicates in each environment. Hybrids were planted at a low density of 29,936 plants ha −1 , a medium density of 63,615 plants ha −1 , and a high density of 97,293 plants ha −1 . Significant differences between hybrids were found for phenomorphological traits and ear characteristics. Inbreds C68, C40 and Ia5125 produced the progeny most tolerant of the highest population density. Among these genotypes, tolerance to high density is a heritable trait, indicating the feasibility of breeding sweet corn for density tolerance and potential weed competitiveness.

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Long‐Term Selection in a Commercial Hybrid Maize Breeding Program

Cited by 262 publications

References 10 publications

Association of secondary traits with yield in maize F 1 's

Association of secondary traits with yield in maize F 1 's

Direct mapping of density response in a population of B73 × Mo17 recombinant inbred lines of maize (Zea Mays L.)

Genetic Variation and Phenotypic Response of 15 Sweet Corn (Zea mays L.) Hybrids to Population Density

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