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Your search keyword '"Menezes Freitas, Miguel Luiz"' showing total 2 results
Start Over Author "Menezes Freitas, Miguel Luiz" Language portuguese
2 results on '"Menezes Freitas, Miguel Luiz"'

1. Variation, heritability and genetic gain in progeny of Eucalyptus tereticornis at 25 years of age in Batatais-SP

Author

Macedo, Hugo Rodrigo [UNESP], Menezes Freitas, Miguel Luiz, Teixeira de Moraes, Mario Luiz [UNESP], Zanata, Marcelo, Sebben, Alexandre Magno, Universidade Estadual Paulista (UNESP), Instituto Florestal, Universidade Estadual Paulista (Unesp), and Inst Florestal

Subjects
Eucalyptus, Quatitative traits, Genetic parameters, Species domestication, Tree breeding
Abstract

Made available in DSpace on 2014-12-03T13:10:27Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-12-01Bitstream added on 2014-12-03T13:23:12Z : No. of bitstreams: 1 WOS000331488800010.pdf: 505141 bytes, checksum: 613c8aa815803d988c1df86c25081345 (MD5) The wood of Eucalyptus tereticornis is intensively used for timber, structures, buildings, poles, posts and coal. The aim of this study was to estimate genetic parameters and genetic and phenotypic correlations in growth and stem form traits of 52 open-pollinated progenies of E. tereticornis sampled from three Australian populations (20 progenies from Helenvale, 19 from Ravenshoe and 13 from Mt. Garnet). The progenies were compared with three commercial control also from Australian. The experimental design used was the compact family block, with the effect of provenance allocated in the plots and progenies within provenances in the subplots. Ten repetitions of the 52 treatments, sub-plots with six plants and the spacing of 3 x 2 m was used. At 25 years of age it was measured the diameter at breast height (DBH), total height, true volume and the stem form. We found genetic variation amon and within the three provenances and the possibility of obtaining high gains from mass selection and individual among and within progenies. The provenance Helenvale showed the best development for DBH, height and volume. The traits DBH, height and volume showed high genetic correlations (> 0.9), indicating the possibility to use the indirect selection. The coefficient of heritability on a progeny mean for the traits DBH and height was median, being 0.31 and 0.30, respectively. The expected genetic gain with the selection were estimated at 12.4% for DBH and 8.5 % for plant height. These results will subsidize the transformation of the provenance and progeny test in a seedling seed orchard and a clonal seed orchard. UNESP Univ Estadual Paulista Julio de Mesquita Fi, FEIS, Ilha Solteira, SP, Brazil Inst Florestal, BR-02377000 Sao Paulo, Brazil UNESP Univ Estadual Paulista Julio de Mesquita Fi, FEIS, Dept Fitotecnia, Ilha Solteira, SP, Brazil UNESP Univ Estadual Paulista Julio de Mesquita Fi, FEIS, Ilha Solteira, SP, Brazil UNESP Univ Estadual Paulista Julio de Mesquita Fi, FEIS, Dept Fitotecnia, Ilha Solteira, SP, Brazil

Published
2013

2. Estimativas de parâmetros genéticos e a variabilidade em procedências e progênies de Handroanthus vellosoi.

Author

Batista, Camila Moreira, Menezes Freitas, Miguel Luiz, de Moraes, Marcela Aparecida, Scatena Zanatto, Antonio Carlos, dos Santos, Pedro César, Zanata, Marcelo, de Moraes, Mario Luiz Teixeira, and Sebbenn, Alexandre Magno

Subjects
*GENETICS, *DIFFERENCES, *PROVENANCES of cultivated plants, *HERITABILITY, *NATURAL selection
Abstract

The present study aimed at estimating genetic parameters and variability among and within provenances for silvicultural traits of Handroanthus vellosoi (Toledo) Mattos, in provenances and progenies test stands, located at the Luiz Antônio Experimental Station (São Paulo State, Brazil). The test was established in the compact family block design, with two provenances (allocated in the plots), six replicates and sub-linear plots of five plants, totalizing 35 progenies. Diameter at breast height (DBH), plant height, cylindrical volume, stem form and survival at 24 years of age were evaluated. Significant differences among the provenances were observed only to the trait stem form. The analysis of deviance showed significant differences among progenies for the joint analysis of the provenances (experimental population), suggesting that the population has high genetic variation and indicating the possibility of genetic improvement by selection of the best progenies. Heritability estimates in individual and family level ranged from low to moderate (26% for DBH, 32% for plant height, 24% for cylindrical volume, 27% for form and 36% for survival), confirming the possibility of genetic improvement by selection and that the provenances have potential to respond to the pressure of natural selection. [ABSTRACT FROM AUTHOR]

Published
2012
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