Data/hora: 23/09/2024 15:52:55

Biblioteca(s): 	Embrapa Gado de Leite.	
Data corrente: 	25/10/2018	
Data da última atualização: 	24/01/2023	
Autoria: 	SILVA, D. M.; SANTOS, Y. D.; BENITES, F. R. G.; TECHIO, V. H.	
Afiliação: 	Dayanne Medrado Silva, UFLA; Yasmim Dutra Santos, UFLA; FLAVIO RODRIGO GANDOLFI BENITES, CNPGL; Vania Helena Techio, UFLA.	
Título: 	Microsporogenesis, viability and morphology of pollen grain in accessions of Cynodon L. C. Rich. (Poaceae).	
Ano de publicação: 	2018	
Fonte/Imprenta: 	South African Journal of Botany, v. 118, p. 260-267, 2018.	
Idioma: 	Inglês	
Conteúdo: 	Plants of the genus Cynodon were considered as weed for a long period. However, this scenario has changed when it was observed that many species could be used in forage farming and for the recovery of degraded areas. Due to the high expansive potential, Cynodon spp. became an option for producers and aroused interest for breeding programs, besides requiring further studies on genetic and cytogenetic variability. Research onmeiosis in Cynodon are scarce since the inflorescences are small and the standardization of the stages of spikelet collections is difficult. The aimof the present studywas to evaluate the microsporogenesis, viability andmorphology of the pollen grains of two accessions of Cynodon dactylon var. dactylon (L.) Pers. (2n=4x=36, bermudagrass) and two accessions of Cynodon nlemfuensis var. nlemfuensis Vanderyst (2n=2x=18, stargrass). The slideswere prepared by squash technique and stained with 2% carmine propionic. For the viability analyses of pollen grains, 2% propionic carmine and Alexander's stain were used. The measurements and the morphology of the pollen grains were defined from analyses with the acetolysis technique and scanning electron microscopy. The meiosis of the four accessions/species was regular. The staining tests showed variations in the viability rate of the pollen grain between the diploid and tetraploid species, being higher among the tetraploids. The pollen grainsmeasured 21.1 and 28.8 &#956;mon average for both species andwere classified as oblate spheroidal,monocolpates and showed no ornamentation, such as spicules and other attachments with non-roughened, micro reticulated exine.	
Palavras-Chave: 	Bermuda grass; Pollen grain; Star grass.	
Thesaurus Nal: 	Forage grasses; Meiosis.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
Registro original: 	Embrapa Gado de Leite (CNPGL)	
Exemplares: 	CNPGL - (24214-1) - UPC - AP - DD -  -  -  - DIS