Heritability of stem straightness and genetic correlations in Eucalyptus cladocalyx in the semi-arid region of Chile

Vargas-Reeve, Felipe; Mora, Freddy; Perret, Sandra; Scapim, Carlos Alberto

doi:10.1590/s1984-70332013000200002

Cited by 22 publications

(24 citation statements)

References 23 publications

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“…According to McDonald et al (2003), most Eyre Peninsula subpopulations are relatively small and fragmented due to clearance for agriculture, while the largest and most continuous populations occur in the southern Flinders Ranges, where they are largely present in conservation parks, which is consistent with the clustering analysis of the present study. Finally, the results showed a significant genetic differentiation among natural provenances consistent with previous studies of phenotypic variation in morphological traits CANÉ-RETAMALES et al, 2011;CONTRERAS-SOTO et al, 2011;VARGAS-REEVE et al, 2013) and chemical compounds in wood durability (BUSH et al, 2011). This information allows for the establishment of a positive relationship between genetic controls and morphometric traits that could be useful for breeding programs.…”

Section: Resultssupporting

confidence: 88%

Analysis of the genetic diversity of Eucalyptus cladocalyx (sugar gum) using ISSR markers

et al. 2015

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ABSTRACT. Eucalyptus cladocalyx F. Muell is a tree endemic to southern Australia and is distributed across four isolated regions: Kangaroo Island, southern Flinders Ranges, and two geographical zones in Eyre Peninsula. E. cladocalyx is capable of growing under extreme environmental conditions, including dry and saline soils. The objective of this study was to analyze genetic diversity in 45 half-sib families planted in northern Chile that are distributed across five different zones (provenances). Genetic variability was assessed using ISSR (Inter Simple Sequence Repeat) molecular markers. The results showed low levels of genetic diversity within populations (He = 0.113 to 0.268) in contrast with other Eucalyptus species. In addition, there was a significant genetic differentiation among provenances (Φst = 0.14); populations from the Kangaroo Island provenance showed more differentiation than any other population. These results are in agreement with previous studies of the species. Our study revealed that Chilean resources are a representative sample of Australian populations; therefore, the germplasm planted in northern Chile would be sufficient for the development of improvement programs. ISSR-Marker technology could be an alternative to identify genotypes of interest in material selection.

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Section: Resultssupporting

confidence: 88%

Analysis of the genetic diversity of Eucalyptus cladocalyx (sugar gum) using ISSR markers

et al. 2015

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“…Notably, other studies have confirmed that some whole-regression methods could overestimate the heritability values [50], and therefore, these findings should be interpreted with caution. Overall, all target traits had pedigree-based heritability estimates from low to moderate (h 2 = 0.08-0.34), which are in accordance with the range usually expected for forest tree growth, flowering and stem quality related traits, including E. cladocalyx [28,29,[51][52][53][54].…”

Section: Heritability Estimatessupporting

confidence: 78%

“…WD was measured indirectly according to Valenzuela et al [28]. STR was measured in the first two-thirds of the total height of tree and was considered as ordinal variables with four levels [53], in which a value of 0 if the stem was strongly twisted, a value of 1 if the stem presents moderate levels of curvature, a value of 2 if the stem was slightly curved, and 3 if the stem was completely straight. The SLD was calculated as the ratio between HT (m) and DBH (m).…”

Section: Plant Materials and Phenotypic Evaluationmentioning

confidence: 99%

Genomic Predictions Using Low-Density SNP Markers, Pedigree and GWAS Information: A Case Study with the Non-Model Species Eucalyptus cladocalyx

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et al. 2020

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High-throughput genotyping techniques have enabled large-scale genomic analysis to precisely predict complex traits in many plant species. However, not all species can be well represented in commercial SNP (single nucleotide polymorphism) arrays. In this study, a high-density SNP array (60 K) developed for commercial Eucalyptus was used to genotype a breeding population of Eucalyptus cladocalyx, yielding only ~3.9 K informative SNPs. Traditional Bayesian genomic models were investigated to predict flowering, stem quality and growth traits by considering the following effects: (i) polygenic background and all informative markers (GS model) and (ii) polygenic background, QTL-genotype effects (determined by GWAS) and SNP markers that were not associated with any trait (GSq model). The estimates of pedigree-based heritability and genomic heritability varied from 0.08 to 0.34 and 0.002 to 0.5, respectively, whereas the predictive ability varied from 0.19 (GS) and 0.45 (GSq). The GSq approach outperformed GS models in terms of predictive ability when the proportion of the variance explained by the significant marker-trait associations was higher than those explained by the polygenic background and non-significant markers. This approach can be particularly useful for plant/tree species poorly represented in the high-density SNP arrays, developed for economically important species, or when high-density marker panels are not available.

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“…The significance of the variances of progenies (genetic) at the 1% probability level by the F test, for the four experiments, indicates the existence of genetic variability between the progenies of each type of pollination and allows for genetic gains through selection (Silveira et al, 2016). This significant effect, in particular the progenies from self-pollination, in which of the four experiments obtained greater percentage gains in three of them, may be related to the higher level of homozygosis, expressing with it greater divergence between the progenies, the one that allows the percentage of larger genetic gains (Vargas-Reeve et al, 2013).…”

Section: Continuaçãomentioning

confidence: 90%

Productive potential and castor bean selection of the FCA-PB cultivar progenies

et al. 2020

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Castor bean is a very important crop, however, in Brazil it still has relatively low productivity, 0.47 Mg ha-1 as a mean. Besides that the Country has significant castor oil demand and depends on international commerce to complement its production. The solution of these problems goes through the development of genotypes highly productive and adapted to the producing regions. So, the objective of this research was to evaluate the productive potential and selection of castor progenies of the cultivar FCA-PB, resulting from three types of pollination, in two crops and in two localities of the State of São Paulo. Grain productivity was evaluated, and some genetic parameters were estimated. In relation to the 2005/2006 crop, the progeny 49 cultivated in the locality of São Manuel produced 4170.66 kg ha-1 of grains. The highest heritability coefficients were observed in the 2005/2006 crop in the locacity of Araçatuba.

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Heritability of stem straightness and genetic correlations in Eucalyptus cladocalyx in the semi-arid region of Chile

Abstract: Abstract

Cited by 22 publications

References 23 publications

<b>Analysis of the genetic diversity of <i>Eucalyptus cladocalyx</i> (sugar gum) using ISSR markers

<b>Analysis of the genetic diversity of <i>Eucalyptus cladocalyx</i> (sugar gum) using ISSR markers

Genomic Predictions Using Low-Density SNP Markers, Pedigree and GWAS Information: A Case Study with the Non-Model Species Eucalyptus cladocalyx

Productive potential and castor bean selection of the FCA-PB cultivar progenies

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