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Search Results: 1 - 10 of 64784 matches for " Adriano Tosoni da Eira;Costa "
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Genetic variation and realized genetic gain from rubber tree improvement
Gon?alves, Paulo de Souza;Aguiar, Adriano Tosoni da Eira;Costa, Reginaldo Brito da;Gon?alves, Elaine Cristine Piffer;Scaloppi Júnior, Erivaldo José;Branco, Roberto Botelho Ferraz;
Scientia Agricola , 2009, DOI: 10.1590/S0103-90162009000100006
Abstract: breeding cycle in rubber extends to 20-30 years between pollination and yield assessment, distributed over three selection stages. five hectares of small scale trial of rubber tree [hevea brasiliensis (willd. ex adr. de juss.) muell.-arg.], was established in the northwestern region of s?o paulo state, brazil. the population comprises 98 clones mostly derived from intensively selected plus tree in the natural forest of rubber tree in the amazon. three open pollinated progeny tests were established in three experimental stations. seedlings from 98 progenies including a commercial check (cc) were planted in each one of the three locations. assessments were made when the plants were one, two and three years old. the variation among progenies for girth was highly significant in all locations examined. in the combined analysis of variance over three locations, differences among progenies were also detected, while progeny × location interaction effect was not significant. narrow sense heritability estimates on individual tree basis (hi2) were variable depending on the characteristic, age of assessment and experimental location. realized genetic gains were calculated for the plant characteristics at the age of three years, by comparing the performance of improved (selected) materials to unimproved materials (cc). the total genetic gain from the genetically tested first generation clone population at votuporanga is estimated as 25% for girth, 14% for rubber yield and 25% for bark thickness. improvement of rubber tree by selection, establishment of clonal population (isolated garden) and progeny testing is a very promising and profitable operation.
Prediction of Hevea progeny performance in the presence of genotype-environment interaction
Gon?alves, Paulo de Souza;Moraes, Mário Luiz Teixeira de;Silva, Marcelo de Almeida;Gouvêa, Lígia Regina Lima;Aguiar, Adriano Tosoni da Eira;Costa, Reginaldo Brito da;
Brazilian Archives of Biology and Technology , 2009, DOI: 10.1590/S1516-89132009000100004
Abstract: twenty two open-pollinated hevea progenies from different parental clones of the asian origin were tested at five sites in the northwestern s?o paulo state brazil to investigate the progeny girth growth, rubber yield, bark thickness and plant height. except for the rubber yield, the analysis of variance indicated highly significant (p<0.01) genotype x environment interaction and heterogeneity of regressions among the progenies. however, the regression stability analysis identified only a few interacting progenies which had regression coefficients significantly different from the expected value of one. the linear regressions of the progeny mean performance at each test on an environmental index (mean of all the progenies in each test) showed the general stability and adaptability of most selected hevea progenies over the test environments. the few progenies which were responsive and high yielding on different test sites could be used to maximize the rubber cultivars productivity and to obtain the best use of the genetically improved stock under different environmental conditions.
Express?o fenotípica de clones de seringueira na regi?o noroeste do estado de S?o Paulo
Gon?alves, Paulo de Souza;Aguiar, Adriano Tosoni da Eira;Gouvêa, Lígia Regina Lima;
Bragantia , 2006, DOI: 10.1590/S0006-87052006000300004
Abstract: the development of new clones with high production combined to other desirable secondary characters is fundamental for a sustainable and competitive rubber tree cultivation. the objective of this study was to evaluate, during a period of 13 years, the phenotypic expression of superior characters of 17 clones of rubber tree grown in the plateau region of s?o paulo state, brazil. the treatments were arranged in a randomized block design with three replicates and six plants per linear plot. the clone iac 40 exhibed the highest yield (2.316 kg ha-1 year-1) followed by iac 300 (1.921 kg), whereas the control clone rrim 600 had 1.493 kg ha-1 year-1 over six years of tapping. the percentage of plants able for opening ranged from 40% for iac 329 to 100% for iac 327. except for iac 56, iac 331 and ian 3156, with 7.21 mm, 7.18 mm and 6.40 mm respectively, all other clones had lower thick virgin bark at opening compared to the control clone rrim 600, which recorded 6.38 mm. except ian 3.156 all clones showed low incidence of panel dryness. the good performance of all clones, both from iac and amazone (ian, fx and ro) allow their recommendation for small scale cultivation, when they would be further tested in different environments of the s?o paulo state, aiming recommendations in large scale.
Carlos Eduardo Rossi,Luiz Henrique Carvalho,Samira Scaff Neves,Adriano Tosoni da Eira Aguiar
Nucleus , 2012,
Abstract: A field experiment was conducted in naturally infested with Pratylenchus brachyurus andRotylenchulus reniformis in order to verify the effect of nitrogen (N) on these nematodes in cotton. The statistical design was randomized blocks with split plot design with four levels of N in the plots (urea: 16, 64, 144 and 256 kgN ha-1) and three cotton cultivars (IPR 02-307, Delta Opal and NuOpal) subplots . The nematodes were extractedfrom samples of soil and roots, identified and their densities estimated. No amount of N affected the population densities of both nematodes and there were no statistical differences between cultivars, although NuOpal and IPR 02-307 show 47.4 and 38.4%, respectively, less Pratylenchus brachyurus than Delta Opal.Um experimento foi instalado em campo naturalmente infestado por Rotylenchulus reniformis e Pratylenchus brachyurus com o objetivo de verificar o efeito do nitrogênio (N) sobre esses nematoides em algodoeiro. O delineamento estatístico foi blocos ao acaso com parcelas subdivididas com 4 níveis de N nas parcelas (ureia: 16, 64, 144 e 256 kg N ha-1) e 3 cultivares de algod o (IPR 02-307, Delta Opal e NuOpal) nas subparcelas. Os nematoides foram extraídos de amostras de solo e raízes, identificados e estimadas suas densidades populacionais. Nenhuma dose de N afetou as densidades populacionais dos dois nematoides e n o se observaram diferen as estatísticas entre as cultivares estudadas, apesar de IPR 02-307 e NuOpal demonstrarem 47,4 e 38,4%, respectivamente, menos nematoides da espécie Pratylenchus brachyurus do que Delta Opal.
Adriano Tosoni da Eira Aguiar,Sandro Roberto Brancali?o,Crlos Eduardo Rossi
Nucleus , 2012,
Abstract: A seringueira é importante para a economia brasileira pela sua participa o na fabrica o 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 agron micas, tais como produ o e vigor e tecnológicas do látex superiores. Foi instalado no município de Campinas-SP um experimento com 20 progênies de meios-irm os 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 repeti es, 10 plantas porparcela, no espa amento de 2 x 2 m. Aos seis e aos 12 meses de idade foram avaliados os caracteres altura da planta e diametro do caule. As progênies em estudo apresentaram um bom comportamento em rela o aos caracteres avaliados. A progênie AVROS 1328 mostrou o maior valor aos 12 meses de idade para a altura da planta e o diametro do caule. Existe a possibilidade de obter grande sucesso com a sele o das melhores plantas desta progênie.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, S o Paulo State, a test was established using 20 half-sib progenies from superior clones presented in therubber tree bank dated 1952 on the Instituto Agron mico (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 throughthe selection among this progenies.
Diversidade química de cafeeiros na espécie Coffea canephora
Aguiar, Adriano Tosoni da Eira;Fazuoli, Luiz Carlos;Salva, Terezinha de Jesus Garcia;Favarin, José Laércio;
Bragantia , 2005, DOI: 10.1590/S0006-87052005000400007
Abstract: the objective of this work was to characterize six c. canephora varieties from the coffee germoplasma collection of instituto agron?mico, in campinas, brazil. for this a chemical characterization of forthy seven examples was performed. soluble solids, lipids, trigonelline, chlorogenic acids and caffeine contents were evaluated on seeds. the results demonstrated the occurrance of great variation among and within the analyzed materials, with values ranging from 24,53% to 30,68% for soluble solids; 6,61% to 12,27% for lipids; 0,73% to 1,59% for trigonelline; 3,30% to 6,30% for chlorogenic acids and 1,94% to 3,29% for caffeine. these results indicate the possibility of selection of superior plants for the improvement of the specie.
Caracteriza??o de cultivares de Coffea arabica mediante utiliza??o de descritores mínimos
Aguiar, Adriano Tosoni da Eira;Guerreiro-Filho, Oliveiro;Maluf, Mirian Perez;Gallo, Paulo Boller;Fazuoli, Luiz Carlos;
Bragantia , 2004, DOI: 10.1590/S0006-87052004000200003
Abstract: the species coffea arabica is responsible for 70% of the world coffee production. the majority of cultivars has a narrow genetic origin, being derived basically from two old cultivars: tipica and bourbon. this investigation was carried out aiming at the characterization of selected cultivars of the instituto agronomico according to standard descriptors. thirty five morphological or technological traits of canopy, leaves, flowers, fruits or seeds and three agronomic traits were evaluated in twenty nine cultivar lines of the current breeding program. the variables plant height, fruit color, leaf rust resistance and earliness are sufficient for an efficient identification of groups of cultivars. the color of young leaves and plant diameter are important descriptors for discriminating cultivars of the mundo novo group, but they could not identify cultivars of the catuaí vermelho, catuaí amarelo and icatu vermelho groups.
Varia??o no teor de lipídios em gr?os de variedades de Coffea canephora
Aguiar, Adriano Tosoni da Eira;Salva, Terezinha de Jesus Garcia;Fazuoli, Luiz Carlos;Favarin, José Laércio;
Pesquisa Agropecuária Brasileira , 2005, DOI: 10.1590/S0100-204X2005001200015
Abstract: the objective of this work was to investigate the variation of lipid content in beans from different varieties of coffea canephora pierre specie, from the coffee germplasm bank, of instituto agron?mico, campinas, sp, brazil. samples of green coffee from 47 plants were analysed: robusta (3), kouilou or conilon 66 (13), apoat? (12), guarini (8), laurentii (7) and bukobensis (4). oil content was determined after a petroleum ether extraction. results showed difference among the average lipid content in kouilou, at 7.33% and robusta, at 10.91%. differences were also observed within plants from the six varieties ranging from 15.57% to 21.63%, for apoat? and laurentii, respectively.
Repeatability of yield and girth growth traits in rubber tree clones of series IAC 300
Adriano Tosoni da Eira Aguiar,Paulo de Souza Gon?alves,Erivaldo José Scaloppi Junior,Juliano Quarteroli Silva
Crop Breeding and Applied Biotechnology , 2006,
Abstract: This study aimed to estimate the repeatability coefficients, to compare the efficiency of methodologies used inthe estimation process, and further to determine the minimal number of evaluations in the selection of rubber tree [Heveabrasiliensis (Willd. ex Adr. de Juss.) Muell. - Arg.] clones. The following methodologies were used: analysis of variance;principal component analysis based on the correlation matrix together with the phenotypic variances and covariance matrix;and the structural analysis. The r values for girth growth varied from 0.77 to 0.79 and rubber yield from 0.39 to 0.52. It wastherefore admitted that the principal component method based on the correlation matrix as well as for the phenotypicvariances and covariance matrix are the most efficient to estimate the coefficient of repeatability. At an accuracy of 90% and80%, two measurements of girth growth and four to six measurements of rubber yield would be necessary for the selection ofrubber tree clones, respectively.
Temporal stability for unpredictable annual climatic variability for Hevea genotype selection
Gon?alves, Paulo de Souza;Moraes, Mário Luiz Teixeira de;Gouvêa, Lígia Regina Lima;Aguiar, Adriano Tosoni da Eira;Scallopi Júnior, Erivaldo José;
Brazilian Archives of Biology and Technology , 2008, DOI: 10.1590/S1516-89132008000100002
Abstract: the objective of this study was to assess genotype-year interaction and determine temporal stable genotypes across six years of rubber yield evaluation. stability analyses were performed by eberhart and russell method for rubber yield. twenty-five genotypes were analyzed in a randomized complete block design with three replications. the best genotype in one year was not same always in the other year. the genotype components were partitioned into linear (genotypes within year) and nonlinear (pooled deviations) components. significant mean square for linear components was predictable. this indicated that the performance of genotypes across the years for rubber yield could be predicted. among the analyzed genotypes the iac 40 also was considered highly productive and vigorous, with suitable adaptation.
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