Data/hora: 16/06/2024 10:53:27

Biblioteca(s): 	Embrapa Arroz e Feijão; Embrapa Milho e Sorgo; Embrapa Soja.	
Data corrente: 	28/10/2003	
Data da última atualização: 	05/06/2018	
Autoria: 	PAGLIARINI, M. S.; DEFANI, M. A.; MEIRELLES, W. F.; PEREIRA, J. E.	
Afiliação: 	WALTER FERNANDES MEIRELLES, CNPMS.	
Título: 	Recurrence of multiple meiotic abnormalities in maize genotypes from the same origin and their influence on productivity.	
Ano de publicação: 	2002	
Fonte/Imprenta: 	Crop Breeding and Applied Biotechnology, Londrina, v. 2, n. 3, p. 355-360, 2002.	
Idioma: 	Inglês	
Conteúdo: 	The frequency of meiotic abnormalities among single-, double- and three-way cross experimental hybrids and their parental inbred lines is studied. Among the sixteen inbred lines examined, fifteen originated from populations developed at the National Center of Research in Maize and Sorghum (CNPMS/Embrapa) and one from a population developed at ESALQ (Faculty of Agriculture Luiz de Queiroz of the University of São Paulo). Previous analyses of homozygous and heterozygous maize genotypes from CNPMS populations demonstrated high meiotic instability. The present investigation aims at analyzing the meiotic behavior of different inbred lines obtained from CNPMS populations by another breeding enterprise to verify the presence of the same abnormalities and determine whether the abnormalities might compromise productivity. Analyses showed the presence of some abnormalities described previously, albeit at a lower frequency. The most common abnormalities in homozygous and heterozygous genotypes from CNPMS populations were related to irregular chromosome segregation and to chromosome stickiness. An inbred line from the ESALQ population showed only abnormalities related to irregular chromosome segregation caused by the presence of univalent chromosomes. The Pearson correlation procedure indicated high negative correlation between meiotic abnormalities and productivity.	
Palavras-Chave: 	Maize; Meiotic abnormalities; Productivity.	
Thesagro: 	Milho; Produtividade.	
Categoria do assunto: 	--
S Ciências Biológicas	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/51085/1/Recurrence-multiple.pdf
http://ainfo.cnptia.embrapa.br/digital/bitstream/item/175901/1/c8128f42-51fe-bcce.pdf	
Registro original: 	Embrapa Milho e Sorgo (CNPMS)	
Exemplares: 	CNPAF - (21736-1) - ADD - AP - -- - 631.05 - C - 2004.00098 - DIS
CNPSO - (22321-1) - UPC - AP - PP -  -  -  - DIS
CNPSO - (22321-2) - UPC - AP - DD -  -  -  - DIS
CNPMS - (16075-1) - UPC - AP - DD -  -  -  - DIS