Variação cromossômica numérica em Pennisetum

Davide, Lisete Chamma; Techio, Vânia Helena; Nunes, Juliane Dornellas; Pereira, Antônio Vander

doi:10.1590/s1413-70542007000200020

Cited by 4 publications

(3 citation statements)

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“…The accession BGC 01 differs significantly from the accessions BGC 39 and BGC 26, which were all collected in Piauí, the accession BGC 26, which was from Piauí, and differs significantly from the accessions BGC 37 and BGC 49, which were collected in Piauí and São Paulo, respectively, in relation to these parameters (Table 2). Davide et al (2007) claim that the presence of karyotypic asymmetry that is associated with significant differences of TLHB and TCL among individuals of the same or closely related species may be the result of chromosomal alterations, such as Robertsonian translocations, inversions, unequal translocations, deletions and duplications. The same authors explain that these alterations can occur because of the environmental conditions, including climate, soil, temperature and moisture, that the individuals are subjected.…”

Section: Resultsmentioning

confidence: 99%

Karyotypic characterization of Capsicum 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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Section: Resultsmentioning

confidence: 99%

Karyotypic characterization of Capsicum sp. accessions

et al. 2015

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“…The Embrapa‐BAGCE is composed of clones, commercial cultivars, wild species of Pennisetum collected in Brazil, and interspecific hybrids between P. purpureum × P. glaucum . This germplasm bank has been characterized by morphological, chemical, cytogenetic, and molecular traits (Shimoya et al, 2002; Techio et al, 2002; Davide et al, 2007; Pereira et al, 2008). However it still lacks a more detailed molecular description to characterize the genetic diversity among the accessions.…”

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Cross Species Amplification of Pennisetum glaucum Microsatellite Markers in Pennisetum purpureum and Genetic Diversity of Napier Grass Accessions

et al. 2012

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Napier grass (Pennisetum purpureum Schum.) is an important forage crop in tropical areas although little is known about its genome information, and few molecular markers have been developed for this species. This work aimed to check the viability of cross‐species amplification of microsatellite markers between pearl millet (Pennisetum glaucum) and Napier grass and to evaluate the genetic diversity among Napier grass germplasm accessions. Fifty‐four microsatellite markers previously described in pearl millet were tested against Napier grass, and 30 markers (55.5%) showed successful cross‐amplification. From them, 18 microsatellite markers were selected to study the genetic diversity in the Embrapa Active Germplasm Bank of Napier Grass (Embrapa‐BAGCE). A total of 180 alleles were identified by these selected microsatellite markers in 107 Napier grass accessions and four pearl millet samples. The average similarity coefficient (Dice) calculated among the Embrapa‐BAGCE accessions was 0.651, ranging from 0.254 to 1.0. Some accessions showed similarity coefficients equal to one, indicating that they have common progenitors or that they might be the same accessions with different denomination. To our knowledge, this work is the first to describe microsatellite markers in Napier grass and represents a significant advance regarding the use of molecular markers in this species.

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“…As variações intraindividuais de número cromossômico em nível somático são denominadas polissomatia e aneussomatia, referentes à ocorrência de poliploidia e aneuploidia, respectivamente (Davide et al 2007). Portanto, em Acosmium diffusissimum e A. lentiscifolium observou-se a ocorrência de aneussomatia.…”

Section: Resultsunclassified

Números cromossômicos em espécies de Acosmium Schott e Leptolobium Vogel (Leguminosae, Papilionoideae)

et al. 2009

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RESUMO -(Números cromossômicos em espécies de Acosmium Schott e Leptolobium Vogel (Leguminosae, Papilionoideae)). O objetivo deste trabalho foi realizar a análise citotaxonômica de espécies de Acosmium Schott e Leptolobium Vogel, através da determinação de seus números cromossômicos. Foram estudadas as três espécies aceitas de Acosmium e cinco espécies de Leptolobium (representando 50% do gênero), a partir de sementes oriundas de diferentes regiões do Brasil. As contagens mitóticas apresentadas para todas as espécies de Acosmium e para quatro espécies de Leptolobium são inéditas. Acosmium cardenasii apresentou uniformemente 2n = 18, enquanto que em A. diffusissimum foram encontradas no mesmo meristema 2n = 18, 24 e 32 e em A. lentiscifolium 2n = 18 e 32. Para Leptolobium, o número cromossômico das espécies estudadas foi de 2n = 18, confirmando uma contagem mitótica anterior para L. dasycarpum. Os resultados obtidos evidenciaram homogeneidade no número cromossômico de Acosmium e Leptolobium, confirmando x = 9 como o número cromossômico básico em ambos os gêneros. Portanto, o número cromossômico não é um caráter taxonômico utilizável na distinção entre Acosmium e Leptolobium. Palavras-chave: aneussomatia, clado genistóide, mosaicismo, Sophoreae, taxonomia ABSTRACT -(Chromosome numbers in species of Acosmium Schott and Leptolobium Vogel (Leguminosae, Papilionoideae)). A cytotaxonomic analysis of species of Acosmium Schott e Leptolobium Vogel was carried out, by determining their chromosome numbers. The three species of Acosmium and five species of Leptolobium (representing 50% of the genus) were studied from seeds obtained from different regions of Brazil. Chromosome counts were new for all Acosmium species and for four Leptolobium species. For Acosmium cardenasii, 2n = 18 was constantly observed, while occurring at the same meristem were found 2n = 18, 24 e 32 in A. diffusissimum and 2n = 18 e 32 in A. lentiscifolium. For Leptolobium, all studied species had 2n = 18, confirming a previous count for L. dasycarpum. The results showed that chromosome numbers of Acosmium and Leptolobium species are homogeneous, confirming the basic number x = 9 for both genera. Therefore, chromosome numbers do not provide a useful taxonomic character distinguishing Acosmium from Leptolobium.

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Variação cromossômica numérica em Pennisetum

Cited by 4 publications

References 13 publications

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

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

Cross Species Amplification of Pennisetum glaucum Microsatellite Markers in Pennisetum purpureum and Genetic Diversity of Napier Grass Accessions

Números cromossômicos em espécies de Acosmium Schott e Leptolobium Vogel (Leguminosae, Papilionoideae)

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