Genetic variability for girth growth and rubber yield in Hevea brasiliensis
Basic knowledge of genetic characteristics of populations is necessary to conduct effective breeding and selection. The objective of this paper is describing the genetic variation of rubber yield and the correlation with other traits, and estimating the genetic parameters for girth growth and total number of latex vessels. Sixty seven clones of Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg. were tested at five sites during 10 years. Characters girth growth at panel opening and rubber yield, showed broad sense heritability on plot mean level, from 0.32 to 0.66 and 0.59 to 0.92, respectively. Predicted genetic gains equal to 0.73 cm and 0.79 g increase respectively on girth and yield in the opening panel and mature phases seems realistic, even with moderate selection intensities. Genetic correlations with rubber yield, bark thickness and total number of latex vessels were very large, and almost no genotype-environment interaction was present for girth growth. High genotype-environment interaction was present for rubber yield with genetic and phenotypic correlations across the sites, ranging from 0.64 to 0.92 (genetic) and 0.63 to 0.89 (phenotypic). Total number of latex vessels rings had a high heritability, ranging from 20.0% to 64.0% in the sites E and B, respectively.
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Escola Superior de Agricultura "Luiz de Queiroz"
2006
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oai:scielo:S0103-901620060003000062006-06-26Genetic variability for girth growth and rubber yield in Hevea brasiliensisGonçalves,Paulo de SouzaSilva,Marcelo de AlmeidaGouvêa,Ligia Regina LimaScaloppi Junior,Erivaldo José rubber tree heritability genetic correlations genotype-environment interaction Basic knowledge of genetic characteristics of populations is necessary to conduct effective breeding and selection. The objective of this paper is describing the genetic variation of rubber yield and the correlation with other traits, and estimating the genetic parameters for girth growth and total number of latex vessels. Sixty seven clones of Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg. were tested at five sites during 10 years. Characters girth growth at panel opening and rubber yield, showed broad sense heritability on plot mean level, from 0.32 to 0.66 and 0.59 to 0.92, respectively. Predicted genetic gains equal to 0.73 cm and 0.79 g increase respectively on girth and yield in the opening panel and mature phases seems realistic, even with moderate selection intensities. Genetic correlations with rubber yield, bark thickness and total number of latex vessels were very large, and almost no genotype-environment interaction was present for girth growth. High genotype-environment interaction was present for rubber yield with genetic and phenotypic correlations across the sites, ranging from 0.64 to 0.92 (genetic) and 0.63 to 0.89 (phenotypic). Total number of latex vessels rings had a high heritability, ranging from 20.0% to 64.0% in the sites E and B, respectively.info:eu-repo/semantics/openAccessEscola Superior de Agricultura "Luiz de Queiroz"Scientia Agricola v.63 n.3 20062006-06-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300006en10.1590/S0103-90162006000300006 |
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Gonçalves,Paulo de Souza Silva,Marcelo de Almeida Gouvêa,Ligia Regina Lima Scaloppi Junior,Erivaldo José |
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Gonçalves,Paulo de Souza Silva,Marcelo de Almeida Gouvêa,Ligia Regina Lima Scaloppi Junior,Erivaldo José Genetic variability for girth growth and rubber yield in Hevea brasiliensis |
author_facet |
Gonçalves,Paulo de Souza Silva,Marcelo de Almeida Gouvêa,Ligia Regina Lima Scaloppi Junior,Erivaldo José |
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Gonçalves,Paulo de Souza |
title |
Genetic variability for girth growth and rubber yield in Hevea brasiliensis |
title_short |
Genetic variability for girth growth and rubber yield in Hevea brasiliensis |
title_full |
Genetic variability for girth growth and rubber yield in Hevea brasiliensis |
title_fullStr |
Genetic variability for girth growth and rubber yield in Hevea brasiliensis |
title_full_unstemmed |
Genetic variability for girth growth and rubber yield in Hevea brasiliensis |
title_sort |
genetic variability for girth growth and rubber yield in hevea brasiliensis |
description |
Basic knowledge of genetic characteristics of populations is necessary to conduct effective breeding and selection. The objective of this paper is describing the genetic variation of rubber yield and the correlation with other traits, and estimating the genetic parameters for girth growth and total number of latex vessels. Sixty seven clones of Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg. were tested at five sites during 10 years. Characters girth growth at panel opening and rubber yield, showed broad sense heritability on plot mean level, from 0.32 to 0.66 and 0.59 to 0.92, respectively. Predicted genetic gains equal to 0.73 cm and 0.79 g increase respectively on girth and yield in the opening panel and mature phases seems realistic, even with moderate selection intensities. Genetic correlations with rubber yield, bark thickness and total number of latex vessels were very large, and almost no genotype-environment interaction was present for girth growth. High genotype-environment interaction was present for rubber yield with genetic and phenotypic correlations across the sites, ranging from 0.64 to 0.92 (genetic) and 0.63 to 0.89 (phenotypic). Total number of latex vessels rings had a high heritability, ranging from 20.0% to 64.0% in the sites E and B, respectively. |
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Escola Superior de Agricultura "Luiz de Queiroz" |
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2006 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300006 |
work_keys_str_mv |
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