Variação genética em caracteres de crescimento em progênies de Dipteryx alata Vog.

Pagliarini, Maximiliano Kawahata; Konrad, Eliana Cristina Generoso; Silva, Flaviana Cavalcanti Da; Silva, Mayte Sarmpaio Cesário Da; Moreira, Juliana Prado; Sato, Aida Sanae; Machado, José Arimatéia Rabelo; Freitas, Miguel Luiz Menezes; Aguiar, A. V. de; Moraes, Mário Luiz Teixeira de; Sebbenn, Alexandre Magno

doi:10.18671/scifor.v44n112.14

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…In the combined site analysis, ℎ 𝑖𝑖 2 was low for all traits (< 0.05), suggesting an unfavorable situation for improvement by mass selection in the experiment. Although ℎ 𝑖𝑖 2 values for all traits in G. crinita were low, they were within the range of values reported for other young tropical trees, such as Calycophyllum spruceanum (Sotelo et al, 2006), Dipteryx alata (Pagliarini et al, 2016), Myracrodruon urundeuva (Canuto et al, 2017), and Theobroma grandiflorum (Chaves et al, 2021). In contrast, 2 m h was moderate for traits (0.34-0.369), and a r in the combined analysis was relatively high (0.583-0.608).…”

Section: Genetic Parameterssupporting

confidence: 80%

Productivity, adaptability, and stability in Guazuma crinita progeny tests across three environments in the Aguaytia River Basin, Ucayali, Perú

et al. 2022

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Guazuma crinita is a fast-growing tree with potential for use in agroforestry systems, due to its rapid wood production, which can contribute significantly to the livelihoods of small-scale farmers in the Peruvian Amazon. However, indiscriminate logging due to high demand is leading to the disappearance of natural forests. As such, the International Council for Research in Agroforestry (ICRAF) began a domestication program to reduce pressure on natural populations of the species. The objective of the present study was to use analyses of genetic parameters, adaptability (PRVG), productivity (MHPRVG), and stability (MHVG), to select G. crinita genotypes from a three-year-old progeny test established in the Aguaytía River Basin, in Ucayali, Peru. The test was established in three different sites, with three blocks, 200 progeny per block, and two individuals per plot. The measured traits were diameter at breast height (DBH), total height (H), and total aerial biomass (B). Significant differences in traits between progenies were detected, but with no genotype x environment interaction (GxE). However, the genotypic correlation among sites was important (> 0.702), suggesting that genetic improvement is possible by selecting the same progeny across sites. The mean heritability among progenies was moderate for all traits (0.34–0.369) and selective precision through combined site analysis was relatively high (0.583–0.608). Based on selection for DBH through combined analysis, MHVG, PRVG, and MHPRVG, 50 superior progenies (25.9 %) were identified for all environments. These should be prioritized in breeding programs as they can offer stable genetic variability for future selection cycles.

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Section: Genetic Parameterssupporting

confidence: 80%

Productivity, adaptability, and stability in Guazuma crinita progeny tests across three environments in the Aguaytia River Basin, Ucayali, Perú

et al. 2022

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“…h 2 a 1=3, which indicates relatively little environmental variation among plots, within blocks, and low environmental correlation among observations within plots (Resende and Sturion 2003). These results mean that we had high experimental precision and low environmental variability within plots, contributing to good accuracy of genetic parameters estimates (Resende 2002;Pagliarini et al 2016). TheĈV g ð%Þ estimates were much higher than what has been reported in the literature for open-pollinated families of other eucalypt species including Eucalyptus tereticornis Sm.…”

Section: Genetic Parameter Estimatesmentioning

confidence: 67%

Are tree breeders properly predicting genetic gain? A case study involving Corymbia species

et al. 2018

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The estimation of quantitative genetic parameters in breeding programs is important to ensure efficient selection. In this context, knowledge of the mating system is critical, as it underpins assumptions about inter-relatedness on which variance component estimation depends. However, proper account of the breeding system is not always taken, either because it is unknown and/or because it is ignored. That eucalypts have a mixed-mating system is well-established, however many breeders use models that assume outcrossed mating with an infinite number of male parents (i.e. allogamous mating), from which genetic parameter estimates are then used to predict genetic gains. First-generation, open-pollinated progeny tests of Corymbia citriodora subsp.

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“…The selection of genotypes in the different progenies evaluated, carried out with the aid of mixed models, presents an optimal property and maximizes genetic gain. However, special attention must be paid to the number of selected progenies and individuals, as the selection of few individuals can lead to the early elimination of important alleles, although it increases genetic gain (PAGLIARINI et al, 2016). In this sense, it is necessary to reconcile genetic gains with the maintenance of variability through the construction of scenarios that will optimize the selection process, such as those carried out in this research, where 72 genotypes from 12 progenies were selected (Table 3).…”

Section: Parameters 1 -------Cn-------------s(%)-----------r(%)------...mentioning

confidence: 99%

Selection of Acacia mearnsii for mini-cutting propagation

Gazzana,

Avinio,

Tonetto

et al. 2024

Cienc. Rural

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Acacia mearnsii De Wild. (Black wattle) is a forest species with great social and economical importance for the southern region of Brazil. This species has multifunctional characteristics, being cultivated to produce tannin, cellulose and energy. This research identified black wattle genotypes with competence for adventitious rooting for mini-cutting propagation. Single-bud mini-cuttings were treated with IBA at a concentration of 2000 mg L-1. After 30 days of cultivation in a humid chamber, the mini-cuttings were evaluated for percentages of survival, rooting, number of roots, average length of the three largest roots, and the number of mini-cuttings rooted per mini-stump. The identification of the best genotypes was performed with the Selegen REML/BLUP software. Selection between and within black wattle progenies can be performed based on the number of rooted mini-cuttings, making it possible to select genotypes with high competence for adventitious rooting while maintaining genetic variability for new selection cycles to develop clones for vegetative propagation by mini-cutting.

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Variação genética em caracteres de crescimento em progênies de Dipteryx alata Vog.

Cited by 5 publications

References 4 publications

Productivity, adaptability, and stability in Guazuma crinita progeny tests across three environments in the Aguaytia River Basin, Ucayali, Perú

Productivity, adaptability, and stability in Guazuma crinita progeny tests across three environments in the Aguaytia River Basin, Ucayali, Perú

Are tree breeders properly predicting genetic gain? A case study involving Corymbia species

Selection of Acacia mearnsii for mini-cutting propagation

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