Relationships among American popcorn and their links with landraces conserved in a microcenter of diversity

Silva, Natália Carolina de Almeida; Vidal, Rafael; Ogliari, Juliana Bernardi; Costich, Denise E.; Chen, Jiafa

doi:10.1007/s10722-020-00935-2

Cited by 11 publications

(6 citation statements)

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“…The third group was unrelated to the first two and contained lowland Avati popcorn. More recently, an analysis of 575 popcorn landraces from Latin America identified nine genetic clusters using discriminant analysis of principal components (DAPC) without considering a priori groups (De Almeida Silva et al., 2020). However, it is important to consider differences in methods when comparing these findings.…”

Section: Discussionmentioning

confidence: 99%

Genetic diversity of North American popcorn germplasm and the effect of population structure on nicosulfuron response

2023

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Popcorn (Zea mays) is an important crop in the United States; however, genetic analyses of popcorn are limited and tend to utilize relatively few markers that cannot capture the total genomic variation. To improve the genomic resources in popcorn, a panel of 320 popcorn accessions was evaluated using 308,811 single nucleotide polymorphisms (SNPs) generated using a genotyping‐by‐sequencing approach. Using this genomic data, several model‐based clustering analyses identified two major groups. The first comprised North American Yellow Pearl Popcorns and accessions of the Chilean Curagua landrace, separated into three subgroups. The second, the Pointed and Latin American Popcorns, included all remaining North American, Latin American, and global accessions. These groups exhibited differences in population structure and genetic diversity. The North American Yellow Pearl Popcorns contain limited genetic diversity compared to the Pointed and Latin American Popcorns. Additionally, phenotypic differences between the two groups were observed in kernel color and nicosulfuron sensitivity. A filtered set of SNPs was curated and used for genome‐wide association studies and popcorn‐specific candidate genes for nicosulfuron tolerance were identified. The genomic characterization described here can be used by breeding programs to accelerate the rate of genetic gain and incorporate genetic diversity into elite popcorn germplasm.

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Section: Discussionmentioning

confidence: 99%

Genetic diversity of North American popcorn germplasm and the effect of population structure on nicosulfuron response

2023

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“…The geographic proximity between the local sweet corn varieties of FWSC and the accessions from Maize BAG of Embrapa collected in the Paraná state could suggest that the varieties of this corn type of the Santa Catarina are derived or descended from such accesses. However, when conserved by farmers over many years, the varieties are subject to constant diversification process, both by the selection pression of the agroecosystem and farmers (Ogliari et al, 2013), which leads to the differentiation of varieties, as evidenced by Silva et al (2020) in studies with local popcorn varieties from the FWSC region. The same may be happening for sweet corn varieties in this region, corroborating with the genetic divergence of the varieties among themselves and with the accesses of Embrapa's Maize BAG.…”

Section: Localmentioning

confidence: 99%

“…Incentive measures for the conservation in situ on farm, sustainable use of agricultural biodiversity, and participatory breeding should be a priority in this region (Costa et al, 2016;Ogliari & Alves, 2007;Silva, Vidal, Ogliari, Costich & Chen, 2020;. Focused on local communities, the participatory breeding combines farmers' knowledge, skills, experiences, practices, and preferences with the knowledge of researchers, makes use of a local genetic base and boosting its conservation and use (Almekinders & Elings, 2001;Machado, 2014;Ogliari, Kist & Canci, 2013).…”

Section: Introductionmentioning

confidence: 99%

Identification of alleles for sweet phenotype in local corn varieties in southern Brazil

Souza

Ogliari

Seledes

et al. 2021

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Sweet corn (Zea mays L.) has high levels of sugar in the endosperm, being used for self-consumption by families in the far west of the state of Santa Catarina (FWSC), southern Brazil. The present work aimed to identify the genes responsible for the sweet phenotype and to characterize morphologically nine local corn varieties conserved in this region. The allelic tests proved the presence of two known recessive alleles (sugary1 mutant/sweet and shrunken2 mutant/super sweet) in eight of the nine varieties studied, and a third gene of unidentified genetic origin. The morphological characterization of ear and grain showed a similarity between the varieties for qualitative characters and a greater variation between and within the varieties for quantitative characters. The cluster analysis divided the materials into four groups and one isolated variety whose gene encoding the sweet phenotype can be a rare gene or still unknown. The results point to the possibility of a new allele having been selected under the specific conditions of the FWSC region, which presents environmental and social factors that influence the diversification of the Zea genus. The continuation of genetic studies on the sweet phenotype of this variety and the development of integrated strategies of in situ on farm and ex situ conservation and participatory breeding in FWSC can contribute to the expansion of the genetic variability of sweet corn and encourage conservation and use of this local germplasm.

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“…In a more recent study, Silva et al (2020), evaluating the genetic diversity of 66 popcorn populations of the FWSC with single nucleotide polymorphism markers (SNPs), showed that the populations with similar grain color and shape were grouped by the genetic markers. In this way, Amaral Júnior et al ( 2011)'s study also was enlightening in characterizing the diversity of white-colored popcorn in comparison to other types of corn by means of inter simple sequence repeats (ISSR) markers.…”

Section: Perspectives For Race Studies and Breedingmentioning

confidence: 99%

“…These races had two distinctives origins: one from the lowland populations of South America, and the other resulting from the selection of women farmers of the region, and subsequent diversification (Silva, Vidal, Ogliari, Costich, & Chen, 2020).…”

Section: Introductionmentioning

confidence: 99%

Relationship between phenological and morphological characteristics of plant with popcorn races of a diversity microcenter in southern Brazil

Júnior

Ogliari

Maghelly

et al. 2021

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The far west region of Santa Catarina (FWSC) state in southern Brazil was indicated as a microcenter of diversity of the Zea genus. In this region, local popcorn varieties are grown in small areas, but in a significant number of farms. The present study aimed to characterize the diversity of 41 local populations from that region, based on phenology and morphological characters of plant, ear and grain. Therefore, an experimental design of complete randomized blocks with two replications was conducted. The data allowed to identify a rich diversity of popcorn in the FWSC for the characteristics of plant, ear, and grain, as well as for the phenology. For the color, 20 populations presented white grain, nine black, nine yellow, two red and one orange. Regarding the cycle, all varieties of yellow and round grains were considered hyper early/early and the varieties of white grains, intermediate/late. Average plant height varied from 1.8 to 3.2 m, while the weight of one thousand kernels varied from 80.9 to 200.4 g. The accumulated day degrees for tasseling ranged from 689.05 to 1,090.57. Based on the cluster analysis of qualitative and quantitative characters, three groups were formed, and five populations were isolated. The inclusion of plant characteristics and phenology can be an important and complementary tool for studies in popcorn races. Trends in some plant characteristics were observed within popcorn varieties with the same grain features. This result is important information for popcorn genetic breeding strategies.

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Relationships among American popcorn and their links with landraces conserved in a microcenter of diversity

Cited by 11 publications

References 50 publications

Genetic diversity of North American popcorn germplasm and the effect of population structure on nicosulfuron response

Genetic diversity of North American popcorn germplasm and the effect of population structure on nicosulfuron response

Identification of alleles for sweet phenotype in local corn varieties in southern Brazil

Relationship between phenological and morphological characteristics of plant with popcorn races of a diversity microcenter in southern Brazil

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