Título:	Chromosome number, microsporogenesis, microgametogenesis, and pollen viability in the Brazilian native grass Mesosetum chaseae (Poaceae).
Autoria:	SILVA, L. A. C. PAGLIARINI, M. S. SANTOS, S. A. SILVA, N. SOUZA, V. F.
Afiliação:	UEM; UEM; SANDRA APARECIDA SANTOS, CPAP; UEM; UEM.
Ano de publicação:	2012
Referência:	Genetics and Molecular Research, v. 11, n. 4, p. 4100-410-, 2012.
Conteúdo:	The genus Mesosetum is a primarily South American genus with 42 species. Mesosetum chaseae, regionally known as ?grama-do-cerrado?, is abundant in the Pantanal Matogrossense (Brazil); it is a valuable resource for livestock and for environmental conservation. We collected specimens from the Nhecolandia sub-region of the Brazilian Pantanal, located in Corumbá, Mato Grosso do Sul, Brazil. We examined chromosome number, ploidy level, meiotic behavior, microgametogenesis, and pollen viability of 10 accessions. All the accessions were diploid, derived from x = 8, presenting 2n = 2x = 16 chromosomes. Chromosomes paired as bivalents showing, predominantly, two terminal chiasmata. Interstitial chiasmata were rare. Meiosis was quite normal producing only a few abnormal tetrads in some accessions. Microgametogenesis, after two mitotic divisions, produced three-celled pollen grains. Pollen viability was variable among plant and accessions and was not correlated with meiotic abnormalities.
NAL Thesaurus:	chromosome number meiosis
Palavras-chave:	Mesosetum chaseae 'Grama-do-cerrado' Microgametogenesis Pollen viability
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPAP)