M.G. Pereira

Phylogeography and population structure analysis reveals diversity by mutations in Lasiodiplodia theobromae with distinct sources of selection

• P.H.D. Santos
• B.M. Carvalho
• K.P. Aguiar
• F.A.S. Aredes
• T.P.S. Poltronieri
• J.M.S. Vivas
• V. Mussi Dias
• G.A. Bezerra
• D.B. Pinho
• M.G. Pereira
• S.F. Silveira

Lasiodiplodia theobromae is a plant pathogen with a worldwide distribution, with low host specificity, causing stem cankers, dieback diseases, and fruit rot in several species of plants. In coconut, this pathogen is reported as the etiological agent of “coconut leaf blight” (CLB) disease, causing several losses in fruit production. The CLB is an importan.. Read More»

Genet. Mol. Res. 16(2): gmr16029681

DOI: 10.4238/gmr16029681

Use of microsatellite markers in molecular analysis of segregating populations of papaya (Carica papaya L.) derived from backcrossing

F.O. Pinto, M.G. Pereira, L.N. Luz, D.L. Cardozo, H.C.C. Ramos and C.M.P. Macedo

Brazil is the world leader in papaya production. However, only a small number of cultivars are registered for commercial planting, mainly owing to delays in obtaining cultivars and the high costs of the field phase of breeding programs. These costs can be reduced when molecular tools are combined with conventional breeding methods. In the present study, we conducted a molecular analysis of a se.. Read More»

Genet. Mol. Res. 12(3): 2013.July.8.6

DOI: 10.4238/2013.July.8.6

Full-sib reciprocal recurrent selection in the maize populations Cimmyt and Piran�£o

K.S. da Cunha M.G. Pereira L.S.A. Gonçalves A.P.C.G. Berilli E.C. de Oliveira H.C.C. Ramos A.T. do Amaral Júnior

We estimated the genetic gains of the 12th cycle of reciprocal recurrent selection for maize traits of agronomic interest. We used 23 ISSR molecular markers in an attempt to maximize genetic variability among and within populations based on selection of S1 progenies. To this end, 138 full-sib families were evaluated in a randomized block design in two environments (the municipalities of Campos dos.. Read More»

Genet. Mol. Res. 11(3): 2012.September.25.8

DOI: 10.4238/2012.September.25.8

RAPD and ISSR markers in the evaluation of genetic divergence among accessions of elephant grass

R.S.N de Lima, R.F. Daher, L.S.A. Gonçalves, D.A. Rossi, A.T. do Amaral Júnior, M.G. Pereira and F.J.S. Lédo

Considering the expected genetic variability of elephant grass (Pennisetum purpureum), due to its cultivation in different continents, we characterized and estimated the genetic divergences between 46 accessions of elephant grass with different edaphoclimatic adaptations, using RAPD and ISSR markers. We evaluated, comparatively, the consistency of the information ac.. Read More»

Genet. Mol. Res. 10(3): vol10-3gmr1107

DOI: 10.4238/vol10-3gmr1107

Genetic-molecular characterization of backcross generations for sexual conversion in papaya (Carica papaya L.)

H.C.C. Ramos1, M.G. Pereira1, T.N.S. Pereira1, G.B.A. Barros1 and G.A. Ferreguetti2

The low number of improved cultivars limits the expansion of the papaya crop, particularly because of the time required for the development of new varieties using classical procedures. Molecular techniques associated with conventional procedures accelerate this process and allow targeted improvements. Thus, we used microsatellite markers to perform genetic-molecular characterization of papaya g.. Read More»

Genet. Mol. Res. 13(4): 2014.December.4.32

DOI: 10.4238/2014.December.4.32

Functional molecular markers (EST-SSR) in the full-sib reciprocal recurrent selection program of maize (Zea mays L.)

K.S.C. Galvão, H.C.C. Ramos, P.H.A.D. Santos, G.C. Entringer, J.C.F. Vettorazzi and M.G. Pereira

This study aimed to improve grain yield in the full-sib reciprocal recurrent selection program of maize from the North Fluminense State University. In the current phase of the program, the goal is to maintain, or even increase, the genetic variability within and among populations, in order to increase heterosis of the 13th cycle of reciprocal recurrent selection. Microsatellite expressed sequen.. Read More»

Genet. Mol. Res. 14(3): 2015.July.3.10

DOI: 10.4238/2015.July.3.10

Genetic parameters in parents and hybrids of circulant diallel in popcorn

R.M. Rangel1, A.T. Amaral Júnior1, C.A. Scapim2, S.P. Freitas Júnior1 and M.G. Pereira1

With the aim of estimating genetic parameters and identifying superior popcorn combinations, 10 parents were crossed in a circulant diallel and evaluated together with the 15 resulting hybrids at two locations in two growing seasons for grain yield, number of broken plants, number of partially husked ears and popping expansion. The hybrids were less sensitive to environmental variations than th.. Read More»

Genet. Mol. Res. 7(4):

Multivariate analysis to determine the genetic distance among backcross papaya (Carica papaya) progenies

H.C.C. Ramos, M.G. Pereira, L.S.A. Gonçalves, A.P.C.G. Berilli, F.O. Pinto and E.H. Ribeiro

Morpho-agronomic and molecular (RAPD and ISSR markers) data were used to evaluate genetic distances between papaya backcross progenies in order to help identify agronomically superior genotypes. Thirty-two papaya progenies were evaluated based on 15 morpho-agronomic characteristics, 20 ISSR and 19 RAPD primers. Manhattan, Jaccard and Gower distances were used to est.. Read More»

Genet. Mol. Res. 11(2): 2012.May.14.2

DOI: 10.4238/2012.May.14.2

Efficiency of circulant diallels via mixed models in the selection of papaya genotypes resistant to foliar fungal diseases

M. Vivas, S.F. Silveira, A.P. Viana, A.T. Amaral Jr., D.L. Cardoso and M.G. Pereira

Diallel crossing methods provide information regarding the performance of genitors between themselves and their hybrid combinations. However, with a large number of parents, the number of hybrid combinations that can be obtained and evaluated become limited. One option regarding the number of parents involved is the adoption of circulant diallels. However, informati.. Read More»

Genet. Mol. Res. 13(3): 2014.July.2.9

DOI: 10.4238/2014.July.2.9

Coconut genome size determined by flow cytometry: Tall versus Dwarf types

M. Freitas Neto1, T.N.S. Pereira1, I.G.C. Geronimo1, A.O.N. Azevedo1,S.R.R. Ramos2 and M.G. Pereira1

Coconuts (Cocos nucifera L.) are tropical palm trees that are classified into Tall and Dwarf types based on height, and both types are diploid (2n = 2x = 32 chromosomes). The reproduction mode is autogamous for Dwarf types and allogamous for Tall types. One hypothesis for the origin of the Dwarf coconut suggests that it is a Tall variant that resulted from either mutation or inbreeding, and dif.. Read More»

Genet. Mol. Res. 15(1): gmr.15017470

DOI: 10.4238/gmr.15017470