Initiation of breeding programs for three species of Corymbia: Introduction and provenances study

The main objective of this study was to investigate genetic control for individual volume (VOL) and genetic and phenotypic correlation between trait measured at two different ages. We also assessed three different selection intensities (i=1%, i=5% and i= 10%) to understand the effects on genetic gain and effective size. Eight progeny tests were evaluated included three tests of C. citriodora (CCT), two tests of C. variegata (CCV), and three tests of C. torelliana (CTO). Narrow-sense heritability (h ̂_a^2) ranged from 0.264 to 0.62 for the CCT tests, from 0.07 to 0.21 for the CCV tests, and from 0.14 to 0.69 for CTO. The coefficients of individual genetic variation (CVgi (%)) ranged from 22.5% to 63.9% for CCT, from 19,3% to 28,3% for CCV, and from 22.8% to 41.3% for CTO. Considering a selection intensity of 10%, the Ne after selection would range from 31 to 98 for CCT, 36 to 47 for CCV, and 45 to 62 for CTO. For the TP8two CTO tests, a selection intensity greater than 10% is recommended. With ana selection intensity of 10%, genetic gains ranged from 25 to 107% for CCT, from 14 to 27% for CCV, and from 19 to 64% for CTO

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Genetic structure and diversity in wild and breeding populations of Eucalyptus urophylla

Barros

Costa

Silva

et al. 2022

Silvae Genetica

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Eucalyptus urophylla S.T. Blake is a species of great commercial importance, especially in tropical regions, and it is the main eucalypts species cultivated in Brazil. This study evaluated the genetic diversity among and within seven populations of E. urophylla and estimated the genetic distance between individuals to draw inferences about the genetic structure between and within the sampled populations. For that, 19 microsatellite markers were genotyped in 254 individuals originating from four wild populations, introduced in Brazil, two breeding populations, and one population consisting of commercial clones. The wild populations of E. urophylla introduced in Brazil have high genetic similarity and the few generations of breeding have already generated significant differences in population structure between improved and wild populations. As expected, breeding populations are closer to commercial clones than wild populations. However, compared to wild populations, breeding populations exhibit greater genetic diversity as they originated from a mixture of provenances. The population formed by clones was the only one that showed a negative Wright fixation index, that is, heterozygosity was higher than expected for a population in Hardy-Weinberg equilibrium.

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Initiation of breeding programs for three species of Corymbia: Introduction and provenances study

Cited by 3 publications

References 23 publications

Variation in adaptation and growth among Corymbia citriodora natural-stand and landrace seed sources in southern China

Variation in adaptation and growth among Corymbia citriodora natural-stand and landrace seed sources in southern China

Genetic control and early selection of three Corymbia species

Genetic structure and diversity in wild and breeding populations of Eucalyptus urophylla

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