Data/hora: 14/06/2024 06:38:22

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