Population structure and genetic diversity of Brazilian popcorn germplasm inferred by microsatellite markers

Silva, Tereza Aparecida da; Cantagalli, Liriana Belizário; Saavedra, Javier; Lopes, Ana Daniela; Mangolin, Claudete Aparecida; Machado, Maria de Fátima Pires da Silva; Scapim, Carlos Alberto

doi:10.1016/j.ejbt.2015.03.005

Cited by 22 publications

(14 citation statements)

References 27 publications

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“…The distribution of these populations in similar groups corroborates the data of Silva et al (2015), analyzing the genetic diversity of a corn-popcorn germplasm bank, in which the use of microsatellite markers allowed the allocation of these same populations in a single group.…”

Section: And the Cophenetic Correlationsupporting

confidence: 81%

“…The highest PIC was reported by Silva et al (2015), in an SSR-EST-marker analysis of popcorn genotypes (PIC = 0.53). However, the presence of a locus with practically null polymorphic information (0.06) was observed, reinforcing the quality of the results obtained in this study, since the locus with the lowest PIC value was much higher than this value (umc2319; PIC = 0.25).…”

Section: Resultsmentioning

confidence: 86%

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Research Article Evaluation of genetic variability to form heterotic groups in popcorn

Vittorazzi¹,

Júnior²,

Guimarães³

et al. 2018

Genet. Mol. Res.

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In view of the narrow genetic base of popcorn, probably due to its evolution by selection from flint maize types alone, knowledge about genetic divergence is imperative for the formation of heterotic groups. Thus, our objective was to identify heterotic groups of popcorn lines; we did so by exploiting the representative genotype collection of the Active Popcorn Germplasm Bank of the State University of Northern Rio de Janeiro. Thirty-eight popcorn genotypes from different origins were analyzed by two methodologies to identify divergent groups. In the first method, the genotypic data were processed to determine the number of groups, based on Bayesian clustering algorithms, and two clustering methods (UPGMA and Ward), based on three genetic distance algorithms, weighted index, unweighted index, and an index of genetic distance or dissimilarity, proposed by Smouse and Peakall. The second methodology identified groups based on simultaneous use of morphoagronomic and molecular information and extracting the genetic distance matrix by the Gower algorithm, and later applying UPGMA and Ward clustering methods. The consistency of the clustering methods was evaluated by cophenetic correlation coefficients. The significance of these coefficients was examined by the Mantel test. There was significant genetic variability among corn popcorn accesses at morphological and molecular levels. There also ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 17 (3): gmr18083 C. Vittorazzi et al 2 was agreement between multivariate clustering techniques, mainly when using genotypic data provided by microsatellite markers. heterotic groups were identified; these were formed mainly according to the origin of each genotype and/or geographic origin. We found that there is sufficient heterosis to develop new cultivars.

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Section: And the Cophenetic Correlationsupporting

confidence: 81%

Section: Resultsmentioning

confidence: 86%

Research Article Evaluation of genetic variability to form heterotic groups in popcorn

Vittorazzi¹,

Júnior²,

Guimarães³

et al. 2018

Genet. Mol. Res.

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show abstract

“…4c). A genotype was assigned to a cluster when its percentage of membership was higher than 0.7, otherwise it was defined as admixed (Bitocchi et al 2012;Dadras et al 2014;Silva et al 2015). Figure 4 shows that among the 145 accessions, 76 were assigned to group I, being the vast majority previously classified as common maize (Table 2).…”

Section: Genetic Diversity and Population Structurementioning

confidence: 99%

Genetic diversity, population structure and AFLP markers associated with maize reaction to southern rust

et al. 2019

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Maize is one of the species with greater genetic diversity among cereals and possibly the most diverse crop species known. Accessing this variability is essential for maize breeding, allowing breeders to achieve progress of yield increasing, overcome environmental challenges or deal with pests and diseases. Among the maize diseases, southern rust is one of the most important, causing significant losses in yield and presenting severe epidemics worldwide. In the present study, the AFLP technique was applied to analyze population structure and genetic diversity among 145 tropical maize inbred lines, and to test for preliminary evidence of association between AFLP markers and the reaction to southern rust. Disease severity was evaluated in two crop seasons and the accessions were genotyped through AFLP using four primer combinations.

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“…The PE is the most important trait of the popcorn hybrids, especially when the objective is to increase the competition between national and foreign cultivars, especially American ones. However, the low genetic variability among the national genotypes (Amaral Júnior et al, 2013b;Silva et al, 2015) strengthens the dependence on the use of foreign cultivars and increases the challenge of popcorn breeding programs in Brazil. In addition, although there is genetic variability in the local cultivars (Miranda et al, 2008), GY is another trait that deserves attention in breeding programs, mainly due to the negative genetic correlation with PE (Cabral et al, 2016).…”

Section: Svmentioning

confidence: 99%

Genetic variability in popcorn synthetic population

et al. 2018

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The Brazilian popcorn has low genetic variability and the successful development of advanced lines, new popcorn cultivars with high grain yield (GY) and expansion volume (PE) is dependent on parental selection and precise determination of heterotic groups. The aim of this study was to evaluate genetic variability and identify heterotic groups in synthetic populations of popcorn, using diallel crosses. Thus, nine synthetic populations were crossed using complete diallel scheme. The GY and PE traits of 36 hybrids and reciprocals were evaluated in a randomized complete block design with 72 treatments and two replicates in two years. The effects of non-additive genes were the most important in the genetic control of these traits, indicating a favorable situation to produce hybrids. The reciprocal effect is mainly due to non-maternal effects for GY and PE. The highest GY values were obtained for the 02 x 08, 04 x 09, 05 x 09, and 01 x 09 crosses and the highest PE were obtained for the 07 x 01 and 03 x 04 crosses. The exploitation of synthetic populations from S3 lines can be an alternative to increase the genetic variability for grain yield and popping expansion in popcorn breeding programs.

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Population structure and genetic diversity of Brazilian popcorn germplasm inferred by microsatellite markers

Cited by 22 publications

References 27 publications

Research Article Evaluation of genetic variability to form heterotic groups in popcorn

Research Article Evaluation of genetic variability to form heterotic groups in popcorn

Genetic diversity, population structure and AFLP markers associated with maize reaction to southern rust

Genetic variability in popcorn synthetic population

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