Cytology and genetics of forage grasses

Myers, Wayne L.

doi:10.1007/bf02861822

Cited by 15 publications

(8 citation statements)

References 268 publications

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“…This inconclusive count appears to be the only cytological information available. Myers ( 17) listed two chromosome counts in the tribe Zoysieae; ,(Tragus racemosus) (L.) All. 2n=40, and Anthephora hermaphrodita (L.) Kuntze 2n=18.…”

Section: Review Of Literaturementioning

confidence: 99%

Chromosome Numbers and Hybrids in Zoysia¹

Forbes¹

1952

Agronomy Journal

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Section: Review Of Literaturementioning

confidence: 99%

Chromosome Numbers and Hybrids in Zoysia¹

Forbes¹

1952

Agronomy Journal

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“…La poliploidía puede aparecer como consecuencia de la formación de gametos no reducidos, por la fecundación simultánea de un gameto femenino y dos masculinos o por la formación de quimeras o mosaicos poliploides, dando origen a poliploides (Lacaeda, 1996). A mayor nivel de ploidía, es mayor el tamaño del núcleo celular como resultado de la duplicación cromosómica y hay mayor producción de biomasa (Mayers, 1947;Echandi, 1970;Lacaeda, 1996;Quero et al, 2010). En especies Somatic chromosome number (2n) was determined from samples of root tips actively growing (5 to 10 mm).…”

Section: Resultados Y Discusiónunclassified

“…Polyploidy can appear as consequence of unreduced gametes formation, by simultaneous fertilization of a female gamete and two male or chimera formation or polyploid mosaics, giving origin to polyploids (Lacaeda, 1996). At higher ploidy level, cell nucleus is of greater size as a result of chromosome duplication and there is higher production of biomass (Mayers, 1947;Echandi, 1970;Lacaeda, 1996;Quero et al, 2010). In sympatric species with different ploidy level, hybridization is abundant, so these are a source of genetic diversity (De Wet, 1986).…”

Section: Resultsmentioning

confidence: 99%

Nivel de ploidía en poblaciones de Leptochloa dubia (Kunth) Nees nativas de México

Velázquez

Carrillo

Bonnett

et al. 2017

Remexca

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Leptochloa dubia (Kunth) Nees es una gramínea forrajera perenne, nativa del centro-norte de México, adaptada a zonas de escaza precipitación, su número cromosómico básico es x= 10 y su nivel de ploidía desde diploide (2n= 2x= 20) a octoploide (2n= 2x= 80). El objetivo fue determinar el número cromosómico y nivel de ploidía de una colección de 67 poblaciones de pasto Gigante, recolectadas durante 2009 en el Altiplano Mexicano entre 19o a 28o latitud norte y 1 500 a 2 450 msnm. Los conteos cromosómicos se realizaron en ápices de raíces en crecimiento activo (5 a 10 mm), tratadas con 8-hidroxiquinolina (2 mM) por 3.5 h, fijadas en solución (3:1 v/v alcohol absoluto y ácido acético glacial) y se conservaron a 4 oC, hasta el momento de su evaluación. El recuento de cromosomas se efectúo en microscopio compuesto de contraste de fases. Se observaron células en metafase, por lo menos, cinco preparaciones y 10 células por preparación, para cada planta y población. El 96% de las plantas analizadas fueron tetraploides 2n= 4x= 40 y 4% diploides 2n= 2x= 20. Las plantas diploides fueron originarias de seis poblaciones de Hidalgo, Guanajuato y de la zona limítrofe entre Aguascalientes, Jalisco y Guanajuato, las plantas tetraploides se encontraron en todas las poblaciones evaluadas; sin embargo, no se encontraron diferencias significativas entre localidades (p< 0.05), de acuerdo a su nivel de ploidía. Los niveles encontrados son indicativos del amplio centro de origen de esta especie.

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“…For example, side oats grama (Bouteloua curtipendula) is a polyploid and aneuploid complex, with reported chromosome numbers ranging from 2N = 20 to 2N = 102 (Myers 1947;Snyder and Harlan 1953;Carnahan and Hill 1961). Switch grass (Panicum virgatum) has two chromosomal races, one simply tetraploid (2N = 36), in lowland areas in the southern part of its range and one a mixture of hexaploids, octoploids, and aneuploids in upland southern and all northern sites (Nielsen 1939;McMillan 1959;Porter 1966; Barnett and Carver 1967;Brunken and Estes 1975).…”

Section: Discussionmentioning

confidence: 99%

Polyploid polymorphism in Andropogon gerardii

Keeler¹,

Kwankin²,

Barnes³

et al. 1987

Genome

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1987. Polyploid polymorphism in Andropogon gerardii. Genome, 29: 374-379. The relationship between nuclear DNA content and chromosome number was investigated in Andropogon gerardii. The distribution of cytotypes in a natural population of this grass was also examined. Nuclear DNA content was determined using flow cytometry rather than the traditional method of Feulgen microphotometry. Our results demonstrate the increased accuracy and speed of this new method in the detection and study of polyploidy. Nuclear DNA content is strongly correlated to chromosome number in Andropogon gerardii ( r = 0.97 1, P < 0.01 ). The natural population of this grass was found to consist of plants with 2N = 60 chromosomes (hexaploid cytotype) and 2N = 80 chromosomes (octoploid cytotype), in equal proportions. Intermediate cytotypes were lacking in the natural population, although three progeny plants grown in the greenhouse from wild-collected seed show intermediate values of nuclear DNA content and have 2N = 70 chromosomes. The two coexisting cytotypes are intermingled and show no difference in microhabitats. The absence of septaploids in the natural population suggests that the two cytotypes are probably reproductively isolated. . 1987. Polyploid polymorphism in Andropogon gerardii.Genome, 29 : 374-379. La relation entre la teneur en ADN nucleaire et le nombre de chromosomes a ete investiguke chez Andropogon gerardii. La distribution des cytotypes chez une population naturelle de cette graminee a aussi 6t6 examinee. La teneur en ADN nucliaire a 196 determinee par cytomCtrie en mouvement continu, plut6t que par la mkthode conventionnelle de microphotographie au Feulgen. Nos r6sultats montrent un accroissement de la precision de cette nouvelle mkthode et sa rapidit6 pour la detection et I'itude de la polyploidie. La teneur en ADN nucleaire est fortement corr6lCe au nombre de chromosomes chez Andropogon gerardii ( r = 0,97 1, P < 0,Ol). La population naturelle de cette graminie s'est avCr6e Etre constituee de plantes a 2N = 60 chromosomes (cytotype hexaploide) et a 2N = 80 chromosomes (cytotype octoploi'de), en proportions igales. Cette population naturelle ne comportait pas de cytotypes intermkdiaires, bien que trois lignies dirivees de graines de plantes sauvages, croissant en serres, ont present6 des valeurs intermediaires de teneur en ADN nucleaire et le nombre de chromosomes Ctait de 2N = 70. Les deux cytotypes coexistants sont entremglks et ne presentent aucune difference relativement a leurs microhabitats. L'absence de septaploides chez cette population naturelle suggkre que les deux cytotypes sont probablement isolCs sur le plan de la reproduction.Mots cle's : polyploi'die, teneurs en ADN, cytometrie en mouvement continu, polymorphisme.[Traduit par la revue]

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Cytology and genetics of forage grasses

Cited by 15 publications

References 268 publications

Chromosome Numbers and Hybrids in Zoysia¹

Chromosome Numbers and Hybrids in Zoysia¹

Nivel de ploidía en poblaciones de Leptochloa dubia (Kunth) Nees nativas de México

Polyploid polymorphism in Andropogon gerardii

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Cytology and genetics of forage grasses

Cited by 15 publications

References 268 publications

Chromosome Numbers and Hybrids in Zoysia1

Chromosome Numbers and Hybrids in Zoysia1

Nivel de ploidía en poblaciones de Leptochloa dubia (Kunth) Nees nativas de México

Polyploid polymorphism in Andropogon gerardii

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Chromosome Numbers and Hybrids in Zoysia¹

Chromosome Numbers and Hybrids in Zoysia¹