Selection and genetic gains for juvenile traits in progenies of Hevea in São Paulo State, Brazil

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dc.contributor.authorGonçalves, Paulo de Souza
dc.contributor.authorMartins, Antonio Lúcio Mello
dc.contributor.authorBortoletto, Nelson
dc.contributor.authorSaes, Luis Alberto
dc.date.accessioned2024-05-16T18:36:52Z
dc.date.available2024-05-16T18:36:52Z
dc.date.issued2004
dc.description.abstractFive yield traits were investigated in three-year-old progenies from open-pollinated rubber trees [Hevea brasiliensis (Willd. ex Adr. de Juss) Muell.-Arg.]. Twenty progenies were evaluated in a randomized, complete block design replicated three times using 10 plants per linear plot at the North Central Experimental Station in Pindorama, São Paulo State, Brazil. The characters evaluated included the average yield of rubber, growth vigor, bark thickness, total number of latex vessel rings and latex vessel size. Highly significant (p < 0.01) genetic differences were observed among progenies for most traits. The genotypic variance components accounted for 13.2%, 12.3%, 9.4%, 3.4% and 0.23% of the phenotypic variance for yield, growth vigor, bark thickness, total number of latex vessel rings and latex vessel size, respectively. Heritabilities, as well as genotypic and phenotypic correlations among traits, were estimated. Heritabilities for the above traits at the individual plant level (<img border=0 id="_x0000_i1026" src="../../../../img/revistas/gmb/v27n2/a14img01.gif" align=absmiddle>) were 37%, 35%, 69%, 10% and 16%, respectively. Significant positive genotypic and phenotypic correlations were found between the yield of rubber and growth vigor (r g = 0.73, r p = 0.70), bark thickness (r g = 0.70**, r p = 0.75**) and the total number of latex vessel rings (r g = 0.64, r p = 0.80). There was no relationship between yield and latex vessel size, growth vigor or total number of latex vessel rings. Based on these data, selecting the best two out of 20 progenies would result in a genetic gain of 12.3% and 6.8% for yield of rubber and growth vigor, respectively. The two best individual ortets within each progeny would result in a genetic gain of 27.7% and 9.1%, with a total gain of 40% and 16% for these two traits, respectively.
dc.identifier.issn1415-4757
dc.identifier.otherS1415-47572004000200014-scl
dc.identifier.urihttps://repositorio-aptaregional.agricultura.sp.gov.br/handle/123456789/1698
dc.relation.ispartofGenetics and Molecular Biology
dc.subjectHevea brasiliensis
dc.subjectrubber tree
dc.subjectheritability
dc.subjectgenetic parameters
dc.titleSelection and genetic gains for juvenile traits in progenies of Hevea in São Paulo State, Brazil
dc.typeArtigos
oaire.citation.endPage214
oaire.citation.issue2
oaire.citation.startPage207
oaire.citation.volume27

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