Variabilidade genética para caracteres de crescimento em progênies de pinhão manso Jatropha curcas
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Data
2010-11-03
Autores
Fernandes, Kairo Henrique Pereira [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O pinhão manso (Jatropha curcas L.) é uma espécie perene com grande potencial para produção de biodiesel, pois apresenta rápido crescimento é de fácil cultivo e com capacidade de adaptação às diversas condições edafoclimáticas. O presente trabalho tem como objetivo avaliar, por meio de teste de progênies, a variabilidade genética de progênies de pinhão manso para as características de crescimento: altura, diâmetro do colo e número de ramos. Foi implantado um teste de progênies na Fazenda São Manuel, localizada no município de São Manuel - SP, pertencente à Faculdade de Ciências Agronômicas, UNESP, Campus de Botucatu. O espaçamento utilizado foi de 4,0 x 2,5 m, em blocos casualizados. Foram analisadas altura, diâmetro da base e número de ramos das plantas de 28 progênies, procedentes principalmente da EPAMIG, e obtidas às estimativas de parâmetros genéticos. As médias de altura e diâmetro foram aos seis meses de 52,38 e 2,91, aos 12 meses 68,87 e 3,98, aos 18 meses 82,31 e 4,23 e aos 24 meses 108,78 e 5,04, respectivamente. Detectou-se diferença estatística pelo Teste F, em nível de 5% de probabilidade, indicando haver variabilidade entre as progênies. As estimativas dos coeficientes de variação genética individual (CVgi) e coeficiente de variação genética de progênies (CVgp) aos 24 meses foram de 26,7 e 13,4% para altura; 15,1 e 7,5% para diâmetro e 21,2 e 10,6% para número de ramos, respectivamente. As estimativas de herdabilidade média de progênies () aos 24 meses foi de 0,36 para altura; 0,35 e para diâmetro e 0,42 para número de ramos, respectivamente. Os resultados obtidos indicam que as progênies de pinhão manso apresentam variabilidade genética para os caracteres avaliados, mostrando potencial para serem utilizadas em programas de melhoramento genético
The jatropha (Jatropha curcas L.) is a perennial species with a great potential for biodiesel production, as it offers rapid growth, moreover it is easy to be cultivated and it has a high capacity of adaptability to various soil and climatic conditions. The objective of this research is to evaluate, by progeny test, the genetic variability for the following characteristics of jatropha’s progenies; growth, height diameter and number of branches. It has been implanted a progeny test, at São Manoel’s farm, located in São Manoel - São Paulo, belonging to the Faculdade de Ciencias Agronomicas, UNESP, Botucatu. The experimental design was random blocs 4,0 x 2,5 m. The project analyzed height, diameter, number of branches of 28 progenies of plants, coming mainly from EPAMIG, and as a result the project obtained estimates of genetic parameters. The average height and diameter in the first six months were 52.38 and 2.91, at twelfth month were 68,87 and 3,98, at eighteenth month were 82,21 and 4,23 and at twenty-fourth month were 108,78 and 5,04. Statistical difference was detected by a F test at 5% level of probability, it indicates variability among the progenies. The coefficient estimates of individual genetic variation and genetic variation of progenies at twenty-fourth months were 26.7 and 13.4% for height, 15,1 and 7,5% for diameter 21.2 and 10.6% for number of branches, respectively. Estimates of heritability at twenty-fourth months were 0.36 for height, 0.35 for diameter and 0.42 for number of branches, respectively. The results obtained indicate that the progenies of jatropha present genetic variability for traits showing potential to be used in breedind programs
The jatropha (Jatropha curcas L.) is a perennial species with a great potential for biodiesel production, as it offers rapid growth, moreover it is easy to be cultivated and it has a high capacity of adaptability to various soil and climatic conditions. The objective of this research is to evaluate, by progeny test, the genetic variability for the following characteristics of jatropha’s progenies; growth, height diameter and number of branches. It has been implanted a progeny test, at São Manoel’s farm, located in São Manoel - São Paulo, belonging to the Faculdade de Ciencias Agronomicas, UNESP, Botucatu. The experimental design was random blocs 4,0 x 2,5 m. The project analyzed height, diameter, number of branches of 28 progenies of plants, coming mainly from EPAMIG, and as a result the project obtained estimates of genetic parameters. The average height and diameter in the first six months were 52.38 and 2.91, at twelfth month were 68,87 and 3,98, at eighteenth month were 82,21 and 4,23 and at twenty-fourth month were 108,78 and 5,04. Statistical difference was detected by a F test at 5% level of probability, it indicates variability among the progenies. The coefficient estimates of individual genetic variation and genetic variation of progenies at twenty-fourth months were 26.7 and 13.4% for height, 15,1 and 7,5% for diameter 21.2 and 10.6% for number of branches, respectively. Estimates of heritability at twenty-fourth months were 0.36 for height, 0.35 for diameter and 0.42 for number of branches, respectively. The results obtained indicate that the progenies of jatropha present genetic variability for traits showing potential to be used in breedind programs
Descrição
Palavras-chave
Pinhão-manso, Plantas perenes, Jatropha curcas, Pinhão-manso - Teste de progênies, Pinhão-manso - Parâmetro genético, Progeny test, Genetic parameters, Perennial plants
Como citar
FERNANDES, Kairo Henrique Pereira. Variabilidade genética para caracteres de crescimento em progênies de pinhão manso Jatropha curcas. 2010. ix, 37 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agronômicas, 2010.