Helleborus

Dhooghe, Emmy; Sparke, Julia; Oenings, Peter; Paemel, Thierry Van; Labeke, Marie-Christine Van; Winkelmann, Traud

doi:10.1007/978-3-319-90698-0_18

Cited by 4 publications

(2 citation statements)

References 34 publications

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“…A study on Sarcococca showed higher cross efficiency between parents with equal ploidy level and genome size compared to parents with different genome size and ploidy level, while far genetic distances were less of a barrier to hybridization [ 27 ]. Instead, for Helleborus only parents with a threshold of 0.264 or higher of genetic proximity could give rise to interspecific hybrid offspring [ 28 ]. For Hydrangea , it has been shown that hybrids between species with large phylogenetic distance are sterile or non-vigorous [ 29 , 30 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Can Knowledge of Genetic Distances, Genome Sizes and Chromosome Numbers Support Breeding Programs in Hardy Geraniums?

Akbarzadeh

Laere

Leus

et al. 2021

Genes

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Breeding programs in ornamentals can be facilitated by integrating knowledge of phylogenetic relatedness of potential parents along with other genomic information. Using AFLP, genetic distances were determined for 59 Geranium genotypes, comprising 55 commercial cultivars of the three subgenera of a total collection of 61 Geranium genotypes. A subgroup of 45 genotypes, including intragroup and intergroup hybrids, were selected and further characterized for genome sizes and chromosome numbers. The variation in genome size ranged from 1.51 ± 0.01 pg/2C to 12.94 ± 0.07 pg/2C. The chromosome numbers ranged from 26 to 108–110 with some hybrids showing an aberrant number of chromosomes based on their parents’ constitution. All chromosome numbers of Geranium are an even number, which presumes that unreduced gametes occur in some cross combinations. Overall, parental difference in genome size and chromosome number were not limiting for cross compatibility. Good crossing compatibility was correlated to a Jaccard similarity coefficient as parameter for parental relatedness of about 0.5. Additionally, parent combinations with high differences in the DNA/chromosome value could not result in a successful cross. We expect that our results will enable breeding programs to overcome crossing barriers and support further breeding initiatives.

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Section: Introductionmentioning

confidence: 99%

Can Knowledge of Genetic Distances, Genome Sizes and Chromosome Numbers Support Breeding Programs in Hardy Geraniums?

Akbarzadeh

Laere

Leus

et al. 2021

Genes

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“…Some studies highlight that knowledge of genetic distance is a good predictor of success in breeding programs [23]. However, in Sarcococca, genetic distance, ploidy level, and genome size did not represent a true hybridization barrier [24], while in Helleborus, a general relationship between genetic distance and hybrid offspring was established [25]. Shortening the breeding cycle is a desirable goal in breeding programs and the use of breeding programs and modeling can greatly help breeders in parental selection, predicting crossing performance, and selecting strategies.…”

Section: Introductionmentioning

confidence: 99%

Prediction Model for Breeding Hardy Geraniums

et al. 2023

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Key message. The success of interspecific hybridization in hardy geranium (Geranium sp.) can be predicted by considering the genetic distance between parental genotypes and using the logistic regression model developed in this study. Hardy geranium is a popular ornamental plant known for its architecture, hardiness, prolonged flowering, and diverse colors in leaves and flowers. In ornamental breeding, the pursuit of novel trait combinations is never-ending. Even in Geranium, certain combinations of valuable traits have not yet been achieved. Interspecific hybridization can increase diversity; however, success remains low due to pre- and postzygotic barriers. Crossing success can be predicted by response criteria such as pollen tube growth (tube_length), seed development (seed_dev), and seed setting (seed_set). Within a collection of 42 Geranium genotypes and during two consecutive breeding seasons (years), we evaluated tube_length, seed_dev, and seed_set for 150, 1155, and 349 crosses, respectively. These crosses varied in four parental differences (variables): chromosome number (Chrom), DNA/chromosome (DNA), style length (Style), and genetic distance expressed as the Jaccard distance (cJaccard = 1 − Jaccard). Using logistic regression models has confirmed that most often, the success rate decreased with increasing parental distance. The most consistent association was seen in seed_dev in combination with cJaccard. The model was used to predict the number of crosses necessary to have 10 successful crossing products by taking into account the uncertainty in the model. These findings provide valuable guidance for future planning of interspecific breeding experiments in Geranium. By incorporating the genetic distance between parental genotypes, breeders can enhance the efficiency and success of hybridization efforts.

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