Genetic improvement

Genetic divergence through joint analysis of morphoagronomic and molecular characters in accessions of Jatropha curcas

C. N. Pestana-Caldas, Silva, S. A., Machado, E. L., de Souza, D. R., Cerqueira-Pereira, E. C., Silva, M. S., Pestana-Caldas, C. N., Silva, S. A., Machado, E. L., de Souza, D. R., Cerqueira-Pereira, E. C., and Silva, M. S., Genetic divergence through joint analysis of morphoagronomic and molecular characters in accessions of Jatropha curcas, vol. 15, p. -, 2016.

The aim of this study was to investigate the genetic divergence between accessions of Jatropha curcas through joint analysis of morphoagronomic and molecular characters. To this end, we investigated 11 morphoagronomic characters and performed molecular genotyping, using 23 inter-simple sequence repeat (ISSR) primers in 46 accessions of J. curcas. We calculated the contribution of each character on divergence using analysis of variance.

Evaluation of genetic divergence among clones of conilon coffee after scheduled cycle pruning

J. M. Dalcomo, Vieira, H. D., Ferreira, A., Lima, W. L., Ferrão, R. G., Fonseca, A. F. A., Ferrão, M. A. G., and Partelli, F. L., Evaluation of genetic divergence among clones of conilon coffee after scheduled cycle pruning, vol. 14, pp. 15417-15426, 2015.

Coffea canephora genotypes from the breeding program of Instituto Capixaba de Pesquisa e Extensão Rural were evaluated, and genetic diversity was estimated with the aim of future improvement strategies. From an initial group of 55 genotypes, 18 from the region of Castelo, ES, were selected, and three clones of the cultivars “Vitória” and “robusta tropical.” Upon completion of the scheduled cycle pruning, 17 morphoagronomic traits were measured in the 22 genotypes selected.

Genetic gains in the UENF-14 popcorn population with recurrent selection

I. L. J. Freitas, Júnior, A. Tdo Amaral, Freitas, Jr., S. P., Cabral, P. D. S., Ribeiro, R. M., and Gonçalves, L. S. A., Genetic gains in the UENF-14 popcorn population with recurrent selection, vol. 13, pp. 518-527, 2014.

The popcorn breeding program of Universidade Estadual do Norte Fluminense Darcy Ribeiro aims to provide farmers a cultivar with desirable agronomic traits, particularly with respect to grain yield (GY) and popping expansion (PE). We evaluated full-sib families from the seventh cycle of recurrent selection and estimated the genetic progress with respect to GY and PE.

Selection of sugar cane families by using BLUP and multi-diverse analyses for planting in the Brazilian savannah

M. H. P. Barbosa, Ferreira, A., Peixoto, L. A., Resende, M. D. V., Nascimento, M., and Silva, F. F., Selection of sugar cane families by using BLUP and multi-diverse analyses for planting in the Brazilian savannah, vol. 13, pp. 1619-1626, 2014.

This study evaluated different strategies to select sugar cane families and obtain clones adapted to the conditions of the Brazilian savannah. Specifically, 7 experiments were conducted, with 10 full sib families, and 2 witnesses in common to all experiments, in each experiment. The plants were grown in random blocks, with witnesses in common (incomplete blocks), and 6 repetitions of each experiment. The data were analyzed through the methodology of mixed patterns, in which the matrices of kinship between the families were identified by the method of restricted maximum likelihood.

MRJP microsatellite markers in Africanized Apis mellifera colonies selected on the basis of royal jelly production

R. S. Parpinelli, Ruvolo-Takasusuki, M. C. C., and Toledo, V. A. A., MRJP microsatellite markers in Africanized Apis mellifera colonies selected on the basis of royal jelly production, vol. 13, pp. 6724-6733, 2014.

It is important to select the best honeybees that produce royal jelly to identify important molecular markers, such as major royal jelly proteins (MRJPs), and hence contribute to the development of new breeding strategies to improve the production of this substance. Therefore, this study focused on evaluating the genetic variability of mrjp3, mrjp5, and mrjp8 and associated allele maintenance during the process of selective reproduction in Africanized Apis mellifera individuals, which were chosen based on royal jelly production.

Strategies in identifying individuals in a segregant population of common bean and implications of genotype x environment interaction in the success of selection

M. P. Mendes, Ramalho, M. A. P., and Abreu, A. F. B., Strategies in identifying individuals in a segregant population of common bean and implications of genotype x environment interaction in the success of selection, vol. 11, pp. 872-880, 2012.

The objective of this study was to compare the BLUP selection method with different selection strategies in F2:4 and assess the efficiency of this method on the early choice of the best common bean (Phaseolus vulgaris) lines. Fifty-one F2:4 progenies were produced from a cross between the CVIII8511 x RP-26 lines. A randomized block design was used with 20 replications and one-plant field plots.

Stability and adaptability of popcorn genotypes in the State of Rio de Janeiro, Brazil

G. F. Pena, Júnior, A. Tdo Amaral, Gonçalves, L. S. A., Candido, L. S., Vittorazzi, C., Ribeiro, R. M., and Júnior, S. P. Freitas, Stability and adaptability of popcorn genotypes in the State of Rio de Janeiro, Brazil, vol. 11, pp. 3042-3050, 2012.

This study aimed to obtain estimates of stability and adaptability of phase launched materials and materials recommended in the country, for the northern and northwestern regions of Rio de Janeiro State, Brazil, and made a comparative analysis of different methods to evaluate stability and adaptability of grain yield and popping expansion. To this end, 10 genotypes were evaluated (UNB2U-C3, UNB2U-C4, BRS Angela, Viçosa, Beija-Flor, IAC 112, IAC 125, Zélia, Jade, and UFVM2 Barão de Viçosa) in five environments.

Spittle protein profile of Mahanarva spectabilis (Hemiptera: Cercopidae) fed various elephant grass genotypes

A. M. Auad, Martins, M. F., Fonseca, I., Paula-Moraes, S. V., Kopp, M. M., and Cordeiro, M. C., Spittle protein profile of Mahanarva spectabilis (Hemiptera: Cercopidae) fed various elephant grass genotypes, vol. 11, pp. 3601-3606, 2012.

An understanding of the interaction between spittlebugs and forage grasses is essential for establishing factors that favor productive pastures. In the present study, we evaluated the protein profiles of the spittle of Mahanarva spectabilis (Distant, 1909) (Hemiptera: Cercopidae) fed various elephant grass genotypes. Each plant was infested with a single fifth-instar M. spectabilis. After 24 h, samples of the spittle produced by each nymph were collected and stored at -20°C, after which their protein profiles were analyzed.

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