Paspalum schesslii (Poaceae, Paspaleae) a new species from Mato Grosso (Brazil) with an unusual base chromosome number
Paspalum schesslii, a new species from the state of Mato Grosso in central-western Brazil, is described and illustrated. The new species is related to P. malmeanum, from central-western Brazil and eastern Bolivia,and Paspalum eucomum, from central Brazil. It comprises shorter plants with leaf blades...
| Otros Autores: | , , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2017bonasoramarisag.pdf LINK AL EDITOR |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
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| 245 | 1 | |a Paspalum schesslii (Poaceae, Paspaleae) |b a new species from Mato Grosso (Brazil) with an unusual base chromosome number | |
| 520 | |a Paspalum schesslii, a new species from the state of Mato Grosso in central-western Brazil, is described and illustrated. The new species is related to P. malmeanum, from central-western Brazil and eastern Bolivia,and Paspalum eucomum, from central Brazil. It comprises shorter plants with leaf blades and racemes shorter than those of the related species, and spikelets having obovate, deciduous upper florets. An unexpected chromosome number 2n = 12 was found in specimens of P. schesslii; thus it differs from both P. malmeanum, which has 2n = 20, and P. eucomum, for which 2n = 30 and 2n = 32 chromosome counts are here reported for the first time. The discovery of a new species having 2n = 12, which often cohabits with diploid populations of the widespread related species, P. stellatum, is consistent with an hypothesis about the hybrid origin of the polyploid cytotypes of P. stellatum having 2n = 32 and 2n = 52 chromosomes. Moreover, such an hybrid origin involvingparental species with different base chromosome numbers (x = 6 and x = 10) could also explain the occurrence of 32 chromosomes in P. eucomum, potentially documenting a speciation mechanism that is otherwise unknown in the genus. | ||
| 653 | |a PASPALUM MALMEANUM | ||
| 653 | |a PASPALUM EUCOMUM | ||
| 653 | |a PASPALUM STELLATUM | ||
| 653 | |a BRAZILIAN FLORA | ||
| 653 | |a CYTOGENETICS | ||
| 653 | |a GRASS TAXONOMY | ||
| 700 | 1 | |9 66907 |a Bonasora, Marisa Graciela |u Cátedra de Botánica Sistemática, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina. bonasora@agro.uba.ar | |
| 700 | 1 | |a Pozzobon, Marisa T. |u EMBRAPA Recursos Geneticos e Biotecnologia, Parque Estaciao Biologica, Final W-5 Norte,Caixa Postal 02372, Brasılia, DF 70770-900, Brazil |9 66910 | |
| 700 | 1 | |9 66911 |a Honfi, Ana I. |u Programa de Estudios Florísticos y Genética Vegetal, Instituto de Biología Subtropical, UNaM-CONICET, Rivadavia 2370, N3300LDX Posadas, Argentina | |
| 700 | 1 | |9 25944 |a Rua, Gabriel Hugo |u Cátedra de Botánica Sistemática, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina | |
| 773 | 0 | |t Plant Systematics and Evolution |g no. 301 (2015), p.2325–2339, il. tbls., grafs., fot., mapas | |
| 856 | |f 2017bonasoramarisag |i En Reservorio: |q application/pdf |u http://ri.agro.uba.ar/files/intranet/articulo/2017bonasoramarisag.pdf |x ARTI201803 | ||
| 856 | |u https://link.springer.com/ |z LINK AL EDITOR | ||
| 942 | |c ARTICULO | ||
| 942 | |c ENLINEA | ||
| 976 | |a AAG | ||