DESENVOLVIMENTO INICIAL DE Khaya ivorensis EM PLANTIO IRRIGADO

Carmo, Romualdo Frederico do; Nakajima, Nelson Yoshihiro; Silva, Samuel Alves da; Mattar, Eduardo Abilhoa

doi:10.31413/nativa.v6i2.5007

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…A straight stem without lateral branches is typically commercial and is a positive indicator for selecting progenies of Khaya senegalensis (Carmo et al 2018).…”

Section: Discussionmentioning

confidence: 99%

Phenotypic divergence among half-sib progenies of African mahogany

Cruz

Barroso

Dias

et al. 2022

An. Acad. Bras. Ciênc.

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Divergence studies are essential for the conservation of genetic resources and guidance in genetic improvement programs. This study aimed to assess the phenotypic dispersion of half-sib progenies using Gower's algorithm and the non-metric multidimensional scaling analysis based on qualitative and quantitative traits. Twentytwo half-sib progenies of African mahogany (Khaya senegalensis) were evaluated in a randomized block design with 22 treatments (progenies/origin), with 30 replications and one plant per plot, totaling 660 plants. The total tree height (cm), diameter at soil level (cm), chlorophyll A and B, presence of bifurcation, presence of lateral branches, stem tortuosity, and the phytosanitary and nutritional status according to a rating scale were evaluated. Data analysis was performed at the progeny mean level for the quantitative traits and the modal value was used for the qualitative traits. The technique used presented the distance between the progenies of K. senegalensis in a graphical form. The dispersion of the progenies in the graph is indicative that there is phenotypic variation in the progeny test, allowing to select individuals with characteristics of interest to improve mahogany for Piauí. Gower's algorithm applied to mixed data and non-metric multidimensional scaling are effi cient methods to describe phenotypic similarities between progenies.

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“…A straight stem without lateral branches is typically commercial and is a positive indicator for selecting progenies of Khaya senegalensis (Carmo et al 2018).…”

Section: Discussionmentioning

confidence: 99%

Phenotypic divergence among half-sib progenies of African mahogany

Cruz

Barroso

Dias

et al. 2022

An. Acad. Bras. Ciênc.

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“…In addition, it justifies plantations with higher density (3 x 2 m, for example) to allow selection of the best trees during thinning. The stems of many K. grandifoliola genotypes have tortuosity problems (Carmo et al, 2018). Thinning these trees should improve the sawn wood productivity.…”

Section: Discussionmentioning

confidence: 99%

Genetic diversity in populations of African mahogany (Khaya grandioliola C. DC.) introduced in Brazil

et al. 2020

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Given its high-valued wood, the African mahogany (Khaya grandifoliola) has been envisaged as a renewable source of tropical hardwoods in Brazil. However, there are concerns about the hypothesized low diversity among the few K. grandifoliola germplasm sources introduced in the country. Using eight microsatellite markers, we evaluated the genetic diversity and divergence among 53 superior trees selected from three provenances of K. grandifoliola located in the state of Pará. These populations are among the oldest plantations (>15 years) in Brazil and, therefore, the country's main seed sources. The average number of alleles per locus was 5.9, expected heterozygosity was moderate (H E =0.56) and lower than the high observed heterozygosity (H O =0.74). Therefore, the intrapopulation fixation index was negative (f=-0.31) indicating the possibility that selection of superior trees might have favored heterozygous plants with heterosis. No genetic structure was observed between provenances. The genetic diversity observed within selected trees, with an effective population size (Ne) of 30.4, is comparable to that of natural populations of African and Brazilian mahoganies. Therefore, our results contradict the idea that the genetic diversity of K. grandifoliola introduced in Brazil is low and show that our germplasm can be exploited for breeding purposes.

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