Effects of selection and opportunities for recombination in doubled‐haploid populations of barley (<i>Hordeum vulgare</i> L.)

Iyamabo, O. E.; Hayes, Patrick

doi:10.1111/j.1439-0523.1995.tb00777.x

Cited by 17 publications

(8 citation statements)

References 21 publications

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“…Similarly, Snape and Simpson (1981) inclined to produce DHs from F 2 generation in barley by comparing the gain in genetic variation for 6 agronomic traits with DH lines derived from F 1 , F 2 , F 3 and intermated F 2 (S3) generations [37]. In contrast, Iyamabo and Hayes (1995) did not found more favorable genotypes in DH lines produced from F 2 generation than that from F 1 generation in barley, therefore, they preferred to use F 1 generation for producing DHs [38]. In present study, the overall breeding efficiency of producing DHs from filial generations was in the order of F 2 >F 3 >F 1 , indication F 2 generation is better for producing DHs in breeding efficiency, which confirmed the majority results above.…”

Section: Discussionmentioning

confidence: 99%

Efficient development of practically usable thermo-photo sensitive genic male sterile lines in wheat through doubled haploid breeding

Abdelkhalik

et al. 2020

Preprint

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Background: Two-line hybrid wheat system using thermo-photo sensitive genic male sterility (TPSGMS) is now a dominant and promising approach of wheat heterosis utilization in China. However, during past twenty years only several TPSGMS lines have been capable of practical application in hybrid wheat breeding and production, which reduced the opportunities and efficiency of creating hybrids with strong heterosis. Introducing doubled haploid (DH) breeding could be a helpful strategy to efficiently develop practically usable TPSGMS lines. Results: F 1 s and selected F 2 and F 3 sterile plants from eight crosses made from two commercial TPSGMS lines were used to produce DH lines by using the wheat × maize system. Twenty four elite sterile lines possessing stable sterility, good outcrossing and yield potential, resistance to yellow rust and powdery mildew, and desirable plant height (50-60 cm) were obtained within 4 years through at least one year evaluation. Twenty from twenty four elite lines showed stable sterility in repeated tests of two or three years, will be selected for hybrid breeding. The percentage of elite lines within total tested DH lines produced from filial generations was in the order of F 2 > F 3 > F 1 in this study. Conclusions: Our study shows that DH breeding is more efficient for the selection of traits controlled by recessive gene(s) compared with conventional breeding, especially for the sterility of TPSGMS wheat. Coupling DH techniques with conventional breeding would be an efficient strategy for developing practically usable wheat TPSGMS lines in respect to number and saving time, which is helpful for further improving the efficiency of wheat hybrid breeding. Producing DHs from F 2 generation appeared to be the better choice considering the balance of shortening breeding time and overall breeding efficiency.

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Section: Discussionmentioning

confidence: 99%

Efficient development of practically usable thermo-photo sensitive genic male sterile lines in wheat through doubled haploid breeding

Abdelkhalik

et al. 2020

Preprint

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“…Plots were spaced 30 cm apart and the seeding rate was 10 seeds per hill. The results of the complete experiment, in terms of population performance, were presented by Iyamabo and Hayes (1994). For the purposes of this study, only data from the 100 Fpderived lines were used.…”

Section: Methodsmentioning

confidence: 99%

Effects of plot type on detection of quantitative‐trait‐locus effects in barley (Hordeum vulgare L.)

Iyamabo

Hayes

1995

Plant Breeding

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Hill plots offer advantages in testing large germplasm arrays with limited area and seed. However, the relationship of trait expression between hill vs. row plots remains in question. The development of quantitativetrait-locus (QTL) analysis offers alternative methods of testing hypotheses regarding levels of coincident gene effects in divergent plots. The objective of this study was to compare hill and row plots in terms of QTL detection, number of common QTLs and plot-type-specific QTLs for various characters in barley. Assessments were based on sets of 100 F,-derived doubled haploid progeny from two environments of hillplot data and two sets of multiple-environment row-plot data. Common large-effect QTLs for height, heading date, and 1000-kernel weight were detected in both plot types. Fewer QTLs were detected in the hill-plot data, with only one QTL detected for grain yield. There were no hillplot-specific QTL effects. Hill plots appear to be best suited to highly heritable characters such as height, heading date, and 1000-kernel weight. Evaluation of grain yield is best deferred until larger experimental units can be employed.Key words: Hordeum vulgare -quantitative trait locusdoubled haploids -hill plots Hill plots are an attractive phenotype assessment option for small-grain germplasm when there are large germplasm arrays and limited seed and/or land (McFerson and Frey 1990). The underlying issue, of course, is the level of coincident trait expression between hill and row plots. In general, there is a consensus that hill plots provide effective discrimination for highly heritable traits, such as maturity and plant height, but there is considerable disagreement as to their effectiveness for traits such as grain yield. The issue is not easily addressed from an experimental standpoint. An advantage of hill plots is that their limited spatial requirements minimize field heterogeneity when large numbers of lines are evaluated. However, in an empirical comparison of row vs. hill plots, the number of entries must be minimized in order not to unduly bias the performance of the row plots.Despite the variety of test statistics employed in comparing data frotn adjacent hill and row plot experiments -the nurnber of lines in common at given selection intensities (Tragoonrung et al. 1990), correlations of various sorts (St. Martin et al. 1990) and coefficients of variation (Pfelffer and Pilcher, 1989) ^ there is still no consensus as to the relative merits of the two plot types. The recent development of medium-density genome-mapping techniques has allowed for estimation of the chromosome location of genes underlying quantitative phenotypes. Quantitative-trait loci (QTLs) for a range of agronomic and maltingquahty traits in barley were described by Hayes et al. (1993), based on the medium-density map reported by Kleinhofs et al. (1993). Hayes et al. (1993) employed conservative criteria for identifying QTL peaks and support intervals for average performance in multiple environments, based on the rationale that chromoso...

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“…Caligari and Powell (1985) found that DH system gave an accurate univariate cross prediction, but multivariate cross prediction based on F 3 families had a more accurate ranking of crosses than the DH system in barley breeding. Selecting the gamete donors may also shift the offspring performance in a desired direction, while postponing the generation for deriving DH should be weighed against any delays and additional costs (Iyamabo and Hayes, 1995). Bernardo (2009) argues that DHs in maize -an outcrossing species-should be induced from F 2 instead of F 1 plants because such an approach does not delay inbred development, particularly if using a year-round nursery to get new F 1 s on a speculative basis.…”

Section: Genetic Gains Through Haploid Breeding Vis-à-vis Other Crossmentioning

confidence: 99%

Haploids: Constraints and opportunities in plant breeding

Dwivedi

Britt

Tripathi

et al. 2015

Biotechnology Advances

226

134

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The discovery of haploids in higher plants led to the use of doubled haploid (DH) technology in plant breeding. This article provides the state of the art on DH technology including the induction and identification of haploids, what factors influence haploid induction, molecular basis of microspore embryogenesis, the genetics underpinnings of haploid induction and its use in plant breeding, particularly to fix traits and unlock genetic variation. Both in vitro and in vivo methods have been used to induce haploids that are thereafter chromosome doubled to produce DH. Various heritable factors contribute to the successful induction of haploids, whose genetics is that of a quantitative trait. Genomic regions associated with in vitro and in vivo DH production were noted in various crops with the aid of DNA markers. It seems that F2 plants are the most suitable for the induction of DH lines than F1 plants. Identifying putative haploids is a key issue in haploid breeding. DH technology in Brassicas and cereals, such as barley, maize, rice, rye and wheat, has been improved and used routinely in cultivar development, while in other food staples such as pulses and root crops the technology has not reached to the stage leading to its application in plant breeding. The centromere-mediated haploid induction system has been used in Arabidopsis, but not yet in crops. Most food staples are derived from genomic resources-rich crops, including those with sequenced reference genomes. The integration of genomic resources with DH technology provides new opportunities for the improving selection methods, maximizing selection gains and accelerate cultivar development. Marker-aided breeding and DH technology have been used to improve host plant resistance in barley, rice, and wheat. Multinational seed companies are using DH technology in large-scale production of inbred lines for further development of hybrid cultivars, particularly in maize. The public sector provides support to national programs or small-medium private seed for the exploitation of DH technology in plant breeding.

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Effects of selection and opportunities for recombination in doubled‐haploid populations of barley (Hordeum vulgare L.)

Cited by 17 publications

References 21 publications

Efficient development of practically usable thermo-photo sensitive genic male sterile lines in wheat through doubled haploid breeding

Efficient development of practically usable thermo-photo sensitive genic male sterile lines in wheat through doubled haploid breeding

Effects of plot type on detection of quantitative‐trait‐locus effects in barley (Hordeum vulgare L.)

Haploids: Constraints and opportunities in plant breeding

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