Genetic parameters of intra- and inter-specific hybrids of Eucalyptus globulus and E. nitens

Volker, Peter; Potts, Brad M.; Borralho, N. M. G.

doi:10.1007/s11295-007-0122-0

Cited by 58 publications

(59 citation statements)

References 23 publications

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“…Plant material and crossing design First-generation E. globulus full-sib families, derived from a factorial design involving base population parents from King Island trees, randomly selected in native stands (pollen parents) or a seed orchard (seed parents, chosen from different families remaining in a growth-culled progeny trial based on accessibility of flowers for crossing) (Volker et al, 2008), were used to generate second-generation full-sib families with four degrees of inbreeding: f ¼ 0% from outcrosses, f ¼ 12.5% from crosses among half sibs, f ¼ 25% from matings among full sibs and f ¼ 50% from selfing. The base population parents are assumed to be unrelated and non-inbred.…”

Section: Methodsmentioning

confidence: 99%

The effects of age and environment on the expression of inbreeding depression in Eucalyptus globulus

Silva¹,

Hardner

Tilyard

et al. 2011

Heredity

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Inbreeding adversely affects fitness traits in many plant and animal species, and the magnitude, stability and genetic basis of inbreeding depression (ID) will have short-and longterm evolutionary consequences. The effects of four degrees of inbreeding (selfing, f ¼ 50%; full-and half-sib matings, f ¼ 25 and 12.5%; and unrelated outcrosses, f ¼ 0%) on survival and growth of an island population of Eucalyptus globulus were studied at two sites for over 14 years. For selfs, ID in survival increased over time, reaching a maximum of 49% by age 14 years. However, their inbreeding depression for stem diameter remained relatively stable with age, and ranged from 28 to 36% across years and sites. ID for survival was markedly greater on the more productive site, possibly due to greater and earlier onset of inter-tree competition, but was similar on both sites for the diameter of survivors. The deleterious trait response to increasing inbreeding coefficients was linear for survival and diameter. Nonsignificant quadratic effects suggested that epistasis did not contribute considerably to the observed ID at the population level. Among-and within-family coefficients of variation for diameter increased with inbreeding degree, and the variance among the outcrossed families was significant only on the more productive site. The performance of self-families for diameter was highly stable between sites. This suggests that, for species with mixed mating systems, environmentally stable inbreeding effects in open-pollinated progenies may tend to mask the additive genotype-by-environment interaction for fitness traits and the adaptive response to the environment.

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Section: Methodsmentioning

confidence: 99%

The effects of age and environment on the expression of inbreeding depression in Eucalyptus globulus

Silva¹,

Hardner

Tilyard

et al. 2011

Heredity

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“…If this hypothesis is false, then a hybrid breeding strategy such as Reciprocal Recurrent Selection (RRS;COMSTOCK et al, 1949) has obvious advantages (VIGNERON and BOUVET, 2000). Although some authors indicated a poor correlation between GCA and GHA (RETIEF and STANGER, 2009;VOLKER et al, 2008), literature related to this topic is sparse and more information regarding this is needed. For instance, results of the latter studies were based on the performance of seedling populations and not clonal populations.…”

Section: Introductionmentioning

confidence: 99%

Genetic Parameters of Interspecific Hybrids of Eucalyptus grandis and E. urophylla Seedlings and Cuttings

et al. 2015

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The current E. grandis x E. urophylla hybrid breeding strategy of South Africa's Forestry Industry is to maintain large breeding populations of both parental species in which parents are selected based on their general combining ability (GCA) estimates or predicted individual tree breeding values and are used for interspecific hybrid crosses. The hybrid material is first screened in seedling progeny trials after which superior individuals are selected and tested as clones. Although this strategy has delivered superior clones for commercial production in South Africa, it is a time consuming strategy to follow and more cost effective strategies are being investigated. In order to review the current hybrid breeding strategy, information on the genetic control of the traits of interest is needed for E. grandis x E. urophylla seedling and clonal populations. The main objectives of this study were therefore to firstly estimate genetic parameters for E. grandis x E. urophylla hybrid seedling and clonal populations; secondly to investigate the correlation between E. grandis and E. urophylla parental (GCA) or individual breeding values and their general hybridising ability (GHA); and lastly to determine the correlation between E. grandis x E. urophylla hybrid seedling ortets and their ramets.Results of our study indicated that non-additive genetic variation explained the majority of the total genetic variation in E. grandis x E. urophylla seedling and clonal populations. Due to the pre-eminence of non-additive variance, the pure-hybrid correlations were weak, especially for clonal populations. It would therefore seem that GCA or predicted individual breeding values are not good predictors of GHA for growth performance in the observed populations. Our study also indicated a weak coefficient of correlation between the growth performance of seedling ortets and their ramets. These results suggest that: firstly a hybrid breeding strategy to capture non-additive genetic variation should be adopted; and secondly that the first phase of screening E. grandis x E. urophylla hybrid material as seedlings should be revisited.

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“…For example, in an F 1 (intraspecific) inter-provenance cross between E. globulus from King Island and Taranna, a reduced viability has been noted relative to an intra-provenance cross from King Island. However, the Taranna intra-provenance cross also performed poorly (VOLKER, 2002). Although most studies have demonstrated hybrid incompatibility in the F 1 generation, barriers to hybridisation may also extend to further generations (outbreeding depression) as noted by POTTS et al (2000) where a reduced growth and survival of E. globulus by E. nitens affected F 1 and F 2 generations.…”

Section: Segregation Distortionmentioning

confidence: 98%

Parental and Consensus Linkage Maps of Eucalyptus globulus Using AFLP and Microsatellite Markers

Potts

Shepherd

et al. 2006

Silvae Genetica

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Parental and consensus maps were constructed in an F2 inter-provenance cross of Eucalyptus globulus, using amplified fragment length polymorphism (AFLP) and microsatellite (or simple sequence repeats [SSR]) markers. The female map had 12 linkage groups and 118 markers, comprising 33 SSR and 85 AFLP loci. The male map had 14 linkage groups and 130 markers comprising 36 SSR and 94 AFLP loci. The integrated map featured 10 linkage groups and 165 markers, including 33 SSR and 132 AFLP loci, a small 11th group was identified in the male parent. Moderate segregation distortion was detected, concentrated in gender specific groups. The strongest distortion was detected in the female parent for which causal mechanisms are discussed. The inclusion of SSR markers previously mapped in several different eucalypt species within the subgenus Symphyomyrtus (E. globulus, E. camaldulensis, and predominantly E. grandis and E. urophylla), allowed comparison of linkage groups across species and demonstrated that linkage orders previously reported in E. globulus, E. grandis and E. urophylla were largely conserved.

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Genetic parameters of intra- and inter-specific hybrids of Eucalyptus globulus and E. nitens

Cited by 58 publications

References 23 publications

The effects of age and environment on the expression of inbreeding depression in Eucalyptus globulus

The effects of age and environment on the expression of inbreeding depression in Eucalyptus globulus

Genetic Parameters of Interspecific Hybrids of Eucalyptus grandis and E. urophylla Seedlings and Cuttings

Parental and Consensus Linkage Maps of Eucalyptus globulus Using AFLP and Microsatellite Markers

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