Descritores Qualitativos E Multicategóricos Na Estimativa Da Variabilidade Fenotípica Entre Acessos De Pimentas

Bento, Cíntia dos Santos; Sudré, Cláudia Pombo; Rodrigues, Rosana; Riva, Elaine Manelli; Pereira, Messias Gonzaga

doi:10.5380/rsa.v8i2.8379

Cited by 42 publications

(39 citation statements)

References 5 publications

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“…On the other hand, the number of coincidences between D, AB, and C ranged from 9 to 12 (Table 4) in experiment 2. In characterizations of pepper accessions, a similar situation was observed (Neitzke et al, 2010;Bento et al, 2007). This emphasizes the need for using the two groups of descriptors in germplasm characterization, since they access different regions of the plant genome.…”

Section: Analysis Of Genetic Diversity Of Accessions In Each Experimentssupporting

confidence: 53%

“…In addition, when dissimilarity measures are calculated based on these descriptors, no joint analysis of qualitative and quantitative data is performed, especially in characterizations of more than one assay, which limits the interpretation of results. Neitzkeet al (2010) and Bento et al (2007) characterized pepper accessions using qualitative and quantitative descriptors. However, the analysis of genetic diversity was performed separately for each set of descriptors, resulting in different clusters.…”

Section: Introductionmentioning

confidence: 99%

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Integration of quantitative and qualitative descriptors for genetic diversity studies of watermelon accessions

Lima¹,

Queiróz²,

Oliveira³

et al. 2017

Aust J Crop Sci

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Most of genetic diversity studies are based only on quantitative descriptors. The aim of this study was to apply different analysis strategies with quantitative and qualitative descriptors to identify which is the most suitable to integrate descriptors for genetic diversity studies of watermelon (Citrullus lanatus) germplasm using different assays. A total of 20 watermelon accessions were evaluated in the State of Rio Grande do Norte and two commercial cultivars were used as witness (control) (Crimson Sweet and Charleston Gray) in two cultivation seasons (2014/2015), using 49 descriptors, in which 26 were quantitative and 23 were qualitative. The genetic diversity of the accessions was obtained using eight analysis strategies that combined the Mahalanobis Distance, Average Standardized Euclidean Distance (SED), and Weighted Average Euclidean Distance, followed by groupings using the Tocher optimization method. A wide morphological variability was observed between and within accessions. The eight different strategies of genetic dissimilarity analyses resulted in 36 different groups. The clustering strategy, by which dissimilarity between accessions calculated using SED (quantitative descriptors) and WED (qualitative descriptors) is the most suitable for integrating quantitative and qualitative descriptors in genetic diversity studies of watermelon germplasm.

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Section: Analysis Of Genetic Diversity Of Accessions In Each Experimentssupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Integration of quantitative and qualitative descriptors for genetic diversity studies of watermelon accessions

Lima¹,

Queiróz²,

Oliveira³

et al. 2017

Aust J Crop Sci

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“…In the species studied here, the various fruit shapes and sizes can be cited as examples of variability: the fruit of C. annuum is a small berry with a smooth texture (MOSCONE et al, 2007); the fruits of C. chinense are elongated, which measure approximately 1.0 to 1.5 cm in diameter and possess a smooth texture (NUEZ-VIÑALS et al, 2003); the fruit of C. frutencens is a smooth fusiform berry (BENTO et al, 2007); and the fruits of C. baccatum are smooth and round but variable in size and shape and average 0.6 cm in diameter and 10 cm in length (CARVALHO et al, 2009).…”

Section: Resultsmentioning

confidence: 99%

<b>Karyotypic characterization of <i>Capsicum</i> sp. accessions

et al. 2015

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ABSTRACT. This study aimed to determine the chromosome number and the karyotype of Capsicum annuum, Capsicum chinense, Capsicum frutencens and Capsicum baccatum accessions in the active Capsicum sp. genebank at the Federal University of Piauí (BGC-UFPI). These species have great economic importance throughout the world, and their cytogenetic characterization can inform taxonomy and lead to improvement in the genus. Karyotypes were obtained from the rootlet meristems of the studied accessions using the squash method and Giemsa staining. The chromosome number 2n=2x=24 was verified for each of the four species. Chromosomal polymorphisms were observed for the C. frutencens accession BGC 37, which presented 12 pairs of metacentric chromosomes instead of 11 pairs of metacentric chromosomes and 1 submetacentric chromosome pair present in other accessions. In the accessions BGC 01 and BGC 37, secondary constrictions were observed in the 1 and 12 as well as in the 6 and 11 homologs, respectively. The karyotypes of the studied species were asymmetrical among themselves. The results obtained in this study confirm the high genetic diversity previously described in the literature for this genus.Keywords: pepper, cytogenetics, genebank, morphometry.Caracterização cariotípica de acessos de Capsicum sp.RESUMO. Este trabalho teve por objetivo caracterizar numérica e morfologicamente os cariótipos de acessos de Capsicum annum, Capsicum chinense, Capsicum frutencens e Capsicum baccatum pertencentes à coleção do Banco ativo de Germoplasma de Capsicum sp. da Universidade Federal do Piauí (BGC-UFPI). Estas espécies têm grande importância econômica em todo mundo, e a caracterização citogenética fornece informações importantes para estudos de taxonomia bem como para programas de melhoramento genético do gênero na qual estão inseridas. Os cariótipos foram obtidos pelo método de esmagamento e coloração com Giemsa de células dos meristemas das radículas dos acessos estudados. A partir dos resultados verificou-se número cromossômico 2n = 2x = 24 para todas as quatro espécies. Foi observado polimorfismo cromossômico para o acesso BGC 37 da espécie C. frutencens, que apresentou 12 pares de cromossomos metacêntricos, diferindo dos outros que apresentaram 11 pares de cromossomos metacêntricos e 1 par de cromossomo sub-metacêntrico. Visualizou-se nos acessos BGC 01 e BGC 37 desta espécie constrições secundárias nos homólogos 1 e 12, e 6 e 11, respectivamente. Os cariótipos das espécies estudadas foram assimétricos entre si. Os resultados obtidos neste estudo corroboram com a grande diversidade genética descrita na literatura para o gênero Capsicum.Palavras-chave: pimenta, citogenética, banco de germoplasma, morfometria.

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“…from the germplasm collection of the Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF) were assessed. These accessions were previously characterized by Sudré et al (2005) and Bento et al (2007) according to morphological and agronomic descriptors; and by Bento et al (2009), for resistance to Pepper yellow mosaic virus (PepYMV; genus Potyvirus, family Potyviridae). The accessions were sown in trays of 128 cells with organic-vegetable substrate.…”

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confidence: 99%

Resistance in Capsicum spp. to anthracnose affected by different stages of fruit development during pre- and post-harvest

Silva¹,

Rodrigues²,

Gonçalves³

et al. 2014

Trop. plant pathol.

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This study aimed to investigate the reaction of unripe and ripe fruits of Capsicum spp. accessions to Colletotrichum gloeosporioides during the pre-and post-harvest periods, and to identify sources of resistance for use in plant breeding programs. Thirty-seven Capsicum spp. accessions of the Universidade Estadual do Norte Fluminense Darcy Ribeiro were evaluated. They were cultivated in a greenhouse and arranged in a completely randomized design with five replications. Twenty fruits from each accession were inoculated at two stages (unripe and ripe) in two different environments (fruits inoculated in the plant and detached fruit inoculated under laboratory conditions). The symptoms were assessed every 24 hours between the 1st and 8th days after inoculation. There were highly significant differences in the values of the area under the disease progress curve and in severity, considering all sources of individual variation and their interactions. Values of low and moderate correlation were observed for inoculation of unripe and ripe fruit in both environments. These results indicate the existence of distinct genes responsible for resistance at different stages of fruit development. Complete lack of symptoms was registered only for accessions UENF 1718 and UENF 1797 (C. baccatum var. pendulum).

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Descritores Qualitativos E Multicategóricos Na Estimativa Da Variabilidade Fenotípica Entre Acessos De Pimentas

Cited by 42 publications

References 5 publications

Integration of quantitative and qualitative descriptors for genetic diversity studies of watermelon accessions

Integration of quantitative and qualitative descriptors for genetic diversity studies of watermelon accessions

<b>Karyotypic characterization of <i>Capsicum</i> sp. accessions

Resistance in Capsicum spp. to anthracnose affected by different stages of fruit development during pre- and post-harvest

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