Estimating genetic gains from alternative breeding strategies for clonal forestry

Mullin, T. J.; Park, Y.S.

doi:10.1139/x92-003

Cited by 68 publications

(38 citation statements)

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“…The average numbers of crosses per parent and clones per full-sib family were 4 and 5, respectively. In terms of connectedness amongst trials, the number of common parents, full-sib families and clones varied between 26 and 37, 22 …”

Section: Plant Materials and Field Trialsmentioning

confidence: 99%

Across-site heterogeneity of genetic and environmental variances in the genetic evaluation of Eucalyptus globulus trials for height growth

Silva¹,

Dutkowski

Borralho³

2005

Ann. For. Sci.

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-Height data from six 3-year-old Eucalyptus globulus trials with cloned progenies were jointly analysed with a heterogeneous variances model. Significant heterogeneity between trial sites was detected for additive genetic and environmental variances, corresponding to coefficients of variation of 41% and 26%, respectively. Two additive genetic and four environmental variances were significantly different from common estimates across all trials. Significant heterogeneity was also detected for heritability estimates, which ranged from 13.5% to 40.3%. Genetic evaluations of parents and clones within full-sib families were obtained from the heterogeneous variances model, and from a simpler model assuming variance homogeneity across trial sites and using either unadjusted data or data pre-adjusted by scale transformations. Changes in predictions of breeding values, top ranking genotypes and selection responses were examined to assess the impact of ignoring heterogeneous variances on the genetic evaluation. Clones were more sensitive than parents to the assumption of homogeneous variances in the evaluation model. Nevertheless, ignoring variance heterogeneity decreased the response to clonal selection by only 2% relatively to the evaluation based on the heterogeneous variances model. Pre-adjusting the data to constant phenotypic or environmental variances reduced the variance heterogeneity. The latter scale transformation was somewhat more effective in increasing fairness of selection, and resulted in close to optimal ranking and selection response. On the basis of the results of this study, Best Linear Unbiased Prediction was fairly robust to erroneously assuming homogeneous variances in a genetic evaluation model. Eucalyptus globulus / heterogeneous variances / genetic evaluation / breeding values / selectionRésumé -Prise en compte de l'hétérogénéité inter-site des variances génétique et environnementale dans l'analyse d'essais d'Eucalyptus globulus pour la croissance en hauteur. Des mesures de hauteur, collectées à 3 ans dans 6 tests de descendances clonées d'Eucalyptus globulus, ont été analysées avec un modèle d'analyse de variance prenant en compte l'hétérogénéité des variances. Une hétérogénéité significative a été mise en évidence entre sites pour les variances génétiques additives et environnementales (CV = 41 % et 26 % respectivement). Deux variances génétiques additives et quatre variances environnementales se sont révélées significativement différentes des variances estimées sur l'ensemble des sites. Une hétérogénéité significative a été aussi mise en évidence pour les héritabilités qui variaient de 13,5 à 40,3 %. Les valeurs génétiques des parents et des clones intra-familles de pleins-frères ont été estimées à partir d'un modèle d'analyse de variance prenant en compte cette hétérogénéité de variances et à partir d'un modèle simple d'analyse de variance assumant l'homogénéité des variances à travers sites, soit sur données non ajustées, soit sur données pré-ajustées par transformation scalaire. Les...

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Section: Plant Materials and Field Trialsmentioning

confidence: 99%

Across-site heterogeneity of genetic and environmental variances in the genetic evaluation of Eucalyptus globulus trials for height growth

Silva¹,

Dutkowski

Borralho³

2005

Ann. For. Sci.

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“…This strategy is increasingly combined with tree improvement programs to allow rapid build-up of stocks for genotype selection trials and propagation of elite material [1,11,20,31,44].…”

Section: Introductionmentioning

confidence: 99%

Towards genetic engineering of maritime pine (Pinus pinaster Ait.)

Trontin¹,

Harvengt²,

Garin³

et al. 2002

Ann. For. Sci.

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-Using our improved protocols for somatic embryogenesis in Pinus pinaster, transgenic tissues and plantlets were recovered after microprojectile bombardment (biolistic) or cocultivation of embryonal-suspensor masses (ESM) with Agrobacterium tumefaciens. Transformation experiments were carried out with selectable hpt gene (hygromycin B resistance) and reporter gus gene (β-glucuronidase activity). With both methods, hygromycin was shown to be an effective selective agent of transformed cells within 4-19 weeks. The mean number of hygromycin-resistant lines expressing gus per gram ESM subjected to DNA transfer, ranged from 7.0 to 8.5 using biolistic and 0 to 67.3 during Agrobacterium experiments. Mature somatic embryos obtained from some transformed lines were converted into plantlets and grown in the greenhouse. The whole process (from transformation to plant acclimatisation) could be completed within only 12 months. The transgenic state of ESM, somatic embryos and plants was confirmed by histochemical GUS assays and molecular methods.

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“…With appropriate respect to the different selection methods, the values of the heritability were calculated as follows (MULLIN and PARK, 1992;XIANG et al, 2003 a, b):…”

Section: Discussionmentioning

confidence: 99%

Variation of the quantitative traits in a progeny test of Abies alba (Mill.) at the nursery stage

2014

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Fifty-one full-sib families were created using 11 parents in a silver fir seed orchard and a half-diallel mating design. The seeds of control-pollinated families were sown in a nursery in autumn 2007. Growth and branches traits were measured during nursery testing, and genetic parameters were estimated at the ages of 3, 4, 5, and 6 years. The additive and dominance genetic variances were major sources of genetic variance. Dominance variance was greater than additive variance at these early ages for all traits. However, the ratio of SCA/GCA variance decreased from 23 to 14 for total height and from 36 to 19 for root collar diameter. Broadsense family heritability is higher than individual heritability. Height and root collar diameter are the most heritable traits in silver fir. The time trend of the five heritability estimates for total height increased with age. Significant trait-trait genetic correlations were obtained. Age-age genetic correlations were very high, and they displayed increasing trends with age. The selection of the most valuable parents and most valuable individuals within the best families could maximise genetic gain in the second breeding generation of silver fir.

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Estimating genetic gains from alternative breeding strategies for clonal forestry

Cited by 68 publications

References 0 publications

Across-site heterogeneity of genetic and environmental variances in the genetic evaluation of Eucalyptus globulus trials for height growth

Across-site heterogeneity of genetic and environmental variances in the genetic evaluation of Eucalyptus globulus trials for height growth

Towards genetic engineering of maritime pine (Pinus pinaster Ait.)

Variation of the quantitative traits in a progeny test of Abies alba (Mill.) at the nursery stage

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