Data/hora: 06/06/2024 10:25:28

Biblioteca(s): 	Embrapa Mandioca e Fruticultura.	
Data corrente: 	11/10/1999	
Data da última atualização: 	11/10/1999	
Autoria: 	CARVALHO, R. de; GUERRA, M.; CARVALHO, P. C. L. de.	
Afiliação: 	Departamento de Botanica(CCB); Universidade Federal de Pernambuco; Departamento de Fitotecnia, Escola de Agronomia de Cruz das Almas, Bahia.	
Título: 	Occurrence of spontaneous triploidy in Manihot esculenta Crantz	
Ano de publicação: 	1999	
Fonte/Imprenta: 	Cytologia, v.64, p.137-140, 1999	
Idioma: 	Inglês	
Conteúdo: 	The spontaneous occurrence of a triploid is reported in Manihot esculenta Crantz collected in Sape-PB, Brazil. Mitotic analysis showed a stable chromosome number of 2n = 54, with chromosome size and morphology very similar to the diploid species. The chromosome behavior in meiosis was irregular in the metaphase-anaphase I, with occurrence of uni, bi and trivalents. The average number of univalents per cell was 7.2. In the tetrad stage, a higher number of micronuclei were found, resulting in almost 100% of abnormal tetrads and pollen sterility. Triploid was also characterized by having larger and fewer stomata than diploid species.	
Palavras-Chave: 	Spontaneous triploidy.	
Thesagro: 	Manihot Esculenta.	
Thesaurus Nal: 	microsporogenesis; stomata.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Mandioca e Fruticultura (CNPMF)	
Exemplares: 	CNPMF - (17360-1) - ADD - SP - -- - S11102 -  - S11102 - DIS