Genome analysis of Mexican flora

Palomino, Guadalupe

doi:10.1590/s1415-47572000000400036

Cited by 4 publications

(4 citation statements)

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“…The karyotype features examined are useful to distinguish among the taxa studied. Chromosome structure and ploidy status as well as the interspecifi c variation of karyotypes (cytotypes) provide indicators of the genetic similarity between populations or species (Palomino, 2000), but caution should be applied in the interpretation of the results. As Hipp et al (2010) have noticed for Carex, different chromosome rearrangements not necessarily represent monophyletic 'races' or infraspecies, in spite that karyotype evolution is a potential player in the speciation in that genus.…”

Section: Discussionmentioning

confidence: 99%

“…The use of karyological data in taxonomy, traditionally referred to as cytotaxonomy or karyosystematics, contribu-tes to evaluate the genetic relationships among species or populations and to a better understanding of the way they diverged from each other (Guerra, 2008). The importance of cytogenetical studies to contribute to the knowledge of Mexican plants has been addressed by Palomino (2000). Some examples of karyotypical and cytogenetical analyses of Mexican plants are those of Flores-Maya et al (2010), Martínez and Palomino (1996), Mercado et al (1989), Mercado-Ruaro y Delgado-Salinas (1998, 2000, Palomino and Heras (2001), Tapia-Pastrana and Gómez-Acevedo (2005), Tapia-Pastrana (2010), Tapia-Pastrana and Jiménez-Salazar (2011), and Tapia-Pastrana et al (2004, 2012.…”

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confidence: 99%

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Caracterización de los cariotipos de ocho especies mexicanas de Eleocharis (Cyperaceae)

et al. 2013

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Se describen los cariotipos de 49 poblaciones de ocho especies de Eleocharis (Cyperaceae) de México. Se reportan por primera vez números cromosómicos para Eleocharis densa, E. reznicekii y E. rostellata, así como nuevos números para E. macrostachya, E. xyridiformis y plantas del complejo de E. montevidensis. Los números cromosómicos van de 2n = 10 a 2n = 60. El mecanismo más común de variación cariotípica es la disploidía, presente en la mitad de las especies (E. densa, E. macrostachya, E. reznicekii y E. xyridiformis). Dos especies son diploides (E. parishii y E. cf. montevidensis) y tres son poliploides (E. acicularis, E. montevidensis y E. ostellata). No se encontró variación intraespecífica en cuanto a números cromosómicos excepto para plantas del complejo de E. montevidensis, pero se encontraron diferencias en tamaño entre poblaciones de ese mismo complejo y en E. rostellata. Las longitudes medias del cariotipo van de 12.96 a 178.25 ?m (en una variante de E. montevidensis y en E. rostellata, respectivamente); los promedios de longitud de los cromosomas van de 0.97 ?m en E. montevidensis a 6.01 ?m en E. xyridiformis, especies que también presentan los extremos de asimetría intercromosomal A2: 0.12 y 0.43, respectivamente. Se confirma la ausencia de constricciones primarias. Se discuten las implicaciones taxonómicas de los datos cariológicos.

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Section: Discussionmentioning

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Caracterización de los cariotipos de ocho especies mexicanas de Eleocharis (Cyperaceae)

et al. 2013

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“…The most common applications of flow cytometry in plants are the determination of genome size, polyploidy, and endopolyploidy [ 33 , 34 , 35 , 36 , 37 , 38 ]. The C-value for approximately 10,770 angiosperms was estimated and is frequently used in systematics and plant improvement studies [ 22 , 33 , 35 , 37 , 38 , 39 , 40 ]. It is reported as an interspecific variation of 2378 times the C-value of DNA in plants when comparing the lowest and the highest values [ 39 ].…”

Section: Introductionmentioning

confidence: 99%

Chromosome Number, Ploidy Level, and Nuclear DNA Content in 23 Species of Echeveria (Crassulaceae)

Palomino

Martínez-Ramón

Cepeda-Cornejo

et al. 2021

Genes

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Echeveria is a polyploid genus with a wide diversity of species and morphologies. The number of species registered for Echeveria is approximately 170; many of them are native to Mexico. This genus is of special interest in cytogenetic research because it has a variety of chromosome numbers and ploidy levels. Additionally, there are no studies concerning nuclear DNA content and the extent of endopolyploidy. This work aims to investigate the cytogenetic characteristics of 23 species of Echeveria collected in 9 states of Mexico, analyzing 2n chromosome numbers, ploidy level, nuclear DNA content, and endopolyploidy levels. Chromosome numbers were obtained from root tips. DNA content was obtained from the leaf parenchyma, which was processed according to the two-step protocol with Otto solutions and propidium iodide as fluorochrome, and then analyzed by flow cytometry. From the 23 species of Echeveria analyzed, 16 species lacked previous reports of 2n chromosome numbers. The 2n chromosome numbers found and analyzed in this research for Echeveria species ranged from 24 to 270. The range of 2C nuclear DNA amounts ranged from 1.26 pg in E. catorce to 7.70 pg in E. roseiflora, while the 1C values were 616 Mbp and 753 Mbp, respectively, for the same species. However, differences in the level of endopolyploidy nuclei were found, corresponding to 4 endocycles (8C, 16C, 32C and 64C) in E. olivacea, E. catorce, E. juarezensis and E. perezcalixii. In contrast, E. longiflora presented 3 endocycles (8C, 16C and 32C) and E. roseiflora presented 2 endocycles (8C and 16C). It has been suggested that polyploidization and diploidization processes, together with the presence of endopolyploidy, allowed Echeveria species to adapt and colonize new adverse environments.

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“…Sin embargo, hasta la fecha no hay estudios que muestren la variación en los números cromosómicos para alguna flora o hábitat en particular. La información es relevante como apoyo en investigaciones sobre evolución y diversificación en floras y hábitats, y para desarrollar y establecer estrategias adecuadas para la conservación (Kenton, 1986;Martínez y Parker, 1995;Palomino, 2000).…”

Section: Introductionunclassified

Números cromosómicos de Asteraceae de la Reserva Ecológica del Pedregal de San Ángel (REPSA), México, Distrito Federal

2011

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Resumen. Se registraron los números cromosómicos mitóticos o meióticos de 31 especies de Asteraceae en la Reserva Ecológica del Pedregal de San Ángel (REPSA), y por primera vez, los conteos cromosómicos de 3 especies endémicas de México: Acourtia cordata (2n= 54), Ageratina cylindrica (2n= 34) y Viguiera buddleiiformis (n= 17). Se discuten los resultados obtenidos de acuerdo con los datos disponibles para cada especie analizada.

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Genome analysis of Mexican flora

Cited by 4 publications

References 28 publications

Caracterización de los cariotipos de ocho especies mexicanas de Eleocharis (Cyperaceae)

Caracterización de los cariotipos de ocho especies mexicanas de Eleocharis (Cyperaceae)

Chromosome Number, Ploidy Level, and Nuclear DNA Content in 23 Species of Echeveria (Crassulaceae)

Números cromosómicos de Asteraceae de la Reserva Ecológica del Pedregal de San Ángel (REPSA), México, Distrito Federal

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