Variação genética de componentes do crescimento em progénies jovens de uma população de clones de seringueira

Gonçalves, Paulo de Souza; Gorgulho, Eliana Patrícia; Martins, Lúcio M.; Bortoletto, Nelson; Cardoso, Mário; Bermond, Guilherme

doi:10.1590/s0006-87051992000200005

Cited by 5 publications

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“…In Brazil, studies on the genetic variation of various traits have been done by Siqueira (1978), Valois et al (1978), Paiva et al (1982Paiva et al ( , 1983, Gonçalves et al (1990Gonçalves et al ( , 1992Gonçalves et al ( , 1996, Moreti et al (1994), Boock et al (1995) and Costa (1999).…”

Section: Introductionmentioning

confidence: 99%

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

Gonçalves¹,

Martins²,

Bortoletto³

et al. 2004

Genet. Mol. Biol.

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Five 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 (h i 2 ) 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.

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Section: Introductionmentioning

confidence: 99%

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

Gonçalves¹,

Martins²,

Bortoletto³

et al. 2004

Genet. Mol. Biol.

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“…Por outro lado, Gonçalves et al (1992) trabalhando com 17 progênies no município de Pindorama, SP obtiveram valores médios de 2,42 m para a altura de planta e 2,01 cm para o diâmetro do caule aos 12 meses de idade. Essa diferença observada entre o presente estudo deve-se provavelmente as diferentes condições ambientais (climáticas e de solo) entre os experimentos.…”

Section: Resultsunclassified

Avaliação Do Desempenho Inicial De Progênies De Seringueira.

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Brancalião

Rossi

2012

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RESUMO:A seringueira é importante para a economia brasileira pela sua participação na fabricação de pneus, artefatos de borracha e também em produtos de uso médico. O crescimento da demanda por borracha natural requer o desenvolvimento de novos clones de seringueira que apresentem características agronômicas, tais como produção e vigor e tecnológicas do látex superiores. Foi instalado no município de Campinas-SP um experimento com 20 progênies de meios-irmãos provenientes de clones superiores do germoplasma estabelecido no ano de 1952 no Centro Experimental Central. Utilizou-se o delineamento de blocos ao acaso, com quatro repetições, 10 plantas por parcela, no espaçamento de 2 x 2 m. Aos seis e aos 12 meses de idade foram avaliados os caracteres altura da planta e diâmetro do caule. As progênies em estudo apresentaram um bom comportamento em relação aos caracteres avaliados. A progênie AVROS 1328 mostrou o maior valor aos 12 meses de idade para a altura da planta e o diâmetro do caule. Existe a possibilidade de obter grande sucesso com a seleção das melhores plantas desta progênie.Palavras-chave: Borracha natural. Hevea brasiliensis. Crescimento. Variabilidade genética. EVALUATION OF THE INITIAL PERFORMANCES OF RUBBER TREE PROGENIES SUMMARY:The rubber tree is currently the sole commercial source of natural rubber. Its importance is given for their participation in the production of tires, rubber products and also in medical devices. The growth of the natural rubber required the development of new rubber tree clones with superior agronomics and technologic latex traits. In Campinas, São Paulo State, a test was established using 20 half-sib progenies from superior clones presented in the rubber tree bank dated 1952 on the Instituto Agronômico (IAC). An experimental design in randomized block was used with 4 replications, 10 plants per plot spaced on 2x2m. At six and 12 months after transplanting plant height and diameter were evaluated. The progenies showed good performance for the analysed traits. The progenie AVROS 1328 showed the higher value for plant height and diameter for both ages. There is the possibility of success through the selection among this progenies.Keywords: Natural rubber. Hevea brasiliensis. Growth. Genetic variability. INTRODUÇÃOHevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg., também conhecida popularmente por seringueira é a espécie mais importante do ponto de vista comercial entre as onze existentes do gênero. É originária do continente americano, precisamente da floresta amazônica do Brasil, e é extremamente importante para o país, em função da utilização do seu látex bem como da sua madeira (GONÇALVES et al., 1990).A madeira da seringueira possui como principal característica o alto teor de carboidratos, qualificando-a como excelente matéria-prima para o segmento moveleiro. Suas principais finalidades são móveis residenciais, de escritório, forro e escadas (KRONKA, 2008).

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Estimates of annual genetic parameters and expected gains in the second cycle of Hevea genotype selection

Gonçalves¹,

Bortoletto²,

Costa³

et al. 2005

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Variação genética de componentes do crescimento em progénies jovens de uma população de clones de seringueira

Cited by 5 publications

References 3 publications

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

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

Avaliação Do Desempenho Inicial De Progênies De Seringueira.

Estimates of annual genetic parameters and expected gains in the second cycle of Hevea genotype selection

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