Research Article

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Genetic diversity; Random amplification of polymorphic DNA; Zea mays

In this study, we analyzed dominant molecular markers to estimate the genetic divergence of 26 popcorn genotypes and evaluate whether using various dissimilarity coefficients with these dominant markers influences the results of cluster analysis. Fifteen random amplification of polymorphic DNA primers produced 157 amplified fragments, of which 65 were monomorphic and 92 were polymorphic. To ... more

F.S. Resh; C.A. Scapim; C.A. Mangolin; M.F.P.S. Machado; A.Tdo Amaral; H.C.C. Ramos; M. Vivas
07/03/2015
EST-SSR markers; Genetic diversity; Reciprocal recurrent selection; Zea mays

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 ... more

K.S.C. Galvão; H.C.C. Ramos; P.H.A.D. Santos; G.C. Entringer; J.C.F. Vettorazzi; M.G. Pereira
12/16/2015
Cytokinin/auxin; Endogenous hormones; Opposite phyllotaxy ratio; Phyllotaxy; Temperature; Zea mays

Newly identified maize (Zea mays) mutants with opposite leaf phyllotaxy are important in the study of the maize crop. Previous studies have revealed the developmental mechanism of opposite phyllotaxy on the physiological, cellular, and molecular levels. However, there have been few reports regarding the effects of changes in endogenous hormone levels in maize leaf primordia under ... more

H. Ye; G.M. Han; Q. Ma; Y.Q. Tan; H.Y. Jiang; S.W. Zhu; B.J. Cheng
11/30/2015
cDNA-AFLP; Heterosis; Non-additive gene expression; Transcriptome level; Zea mays

Heterosis has greatly contributed to conventional plant breeding and is widely used to increase crop plant productivity. However, although some studies have explored the mechanisms of heterosis at the genomic and transcriptome level, these mechanisms still remain unclear. The growth and development of maize seedlings and immature embryos have an important impact on subsequent production. ... more

H.S. Nie; S.P. Li; X.H. Shan; Y. Wu; S.Z. Su; H.K. Liu; J.Y. Han; Y.P. Yuan
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Grain yield; Multi-trait selection; Popping expansion; Zea mays

One of the major difficulties faced by popcorn breeders is the negative correlation between popping expansion (PE) and grain yield (GY). It is necessary to overcome this difficulty to obtain promising genotypes. One helpful tool in this process is a selection index because it allows multiple features of interest to be selected. Thus, the present study proposes a new and comprehensive ... more

R.A. Vieira; R. Rocha; C.A. Scapim; A.T.Amaral Júnior; M. Vivas; R.A. Vieira; R. Rocha; C.A. Scapim; A.T.Amaral Júnior; M. Vivas; R.A. Vieira; R. Rocha; C.A. Scapim; A.T.Amaral Júnior; M. Vivas
09/23/2016
Agronomic traits; Heterosis; Zea mays

Currently, one of the acclaimed alternatives for increasing maize yield is accomplished through utilization of heterosis in hybrid cultivars. However, upon performing crosses between related pairs, there are losses due to inbreeding depression. Thus, the aim of this study was to estimate inbreeding depression and the contribution of loci in heterozygosity in different types of maize ... more

F.B.S. Botelho; A.T. Bruzi; I.P. Lima; C.S. Rodrigues; R.Tde C. Botelho; F.B.S. Botelho; A.T. Bruzi; I.P. Lima; C.S. Rodrigues; R.Tde C. Botelho
08/12/2016
Heat shock; Late embryogenesis; Protein abundance; Zea mays

Low water availability is one of the factors that limit agricultural crop development, and hence the development of genotypes with increased water stress tolerance is a challenge in plant breeding programs. Heat-resistant proteins have been widely studied, and are reported to participate in various developmental processes and to accumulate in response to stress. This study aimed to ... more

V.M. Abreu; I.C.Silva Neta; E.V.R. Von Pinho; G.M.F. Naves; R.M. Guimarães; H.O. Santos; R.G. Von Pinho; V.M. Abreu; I.C.Silva Neta; E.V.R. Von Pinho; G.M.F. Naves; R.M. Guimarães; H.O. Santos; R.G. Von Pinho
02/08/2017
Brazil; Breeding; Crosses, Genetic; Genetics, Population; Genotype; Phenotype; Zea mays

In Brazil, the total production of maize has increased continuously due to the advances in technology but also to the new frontiers for the maize crop, including the expansion of the second crop (safrinha; usually maize after soybean). Therefore, the exploitation of new sources of germplasm seems to be imperative to attend the actual and future demands for modern cultivars adapted to the ... more

C.M. Silva; J.B.Miranda Filho; U.C. Mendes; E.F. Reis
02/16/2017
Bacteria; DNA, Bacterial; DNA, Ribosomal; Endophytes; Gluconates; Phosphates; Phylogeny; Plant Leaves; Plant Roots; RNA, Ribosomal, 16S; Sequence Analysis, DNA; Soil Microbiology; Zea mays

In the present study, we demonstrated the in vitro activity of endophytic phosphate-solubilizing bacteria (PSB). Fifty-five endophytic PSB that were isolated from sap, leaves, and roots of maize were tested for their ability to solubilize tricalcium phosphate and produce organic acid. Partial sequencing of the 16S rRNA-encoding gene showed that the isolates were from the genus Bacillus and ... more

C.S. de Abreu; J.E.F. Figueiredo; C.A. Oliveira; V.L.Dos Santos; E.A. Gomes; V.P. Ribeiro; B.A. Barros; U.G.P. Lana; I.E. Marriel
03/22/2017
Chromosomes, Plant; Colchicine; Genes, Plant; Genotype; Haploidy; Inflorescence; Plant breeding; seeds; Zea mays

Doubling method is the technical barriers in maize haploid breeding. It was very important to establish the independent intellectual property rights for doubling method. In this experiment, the maize haploid inducer, TG15, was used for producing maternal haploids. Also, haploids were obtained from two kinds of maternal genotypes involved in the experiment, including high-oil type and common ... more

L. Jiang; X.Y. Yang; X.Y. Li; P.K. Deng; G.X. Jing; X.Q. Wang; Z. Xing; R.G. Zhao

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