A molecular and embryonic study of apomixis in cassava (Manihot esculenta Crantz)

• Autor(a) principal: Nassar, Nagib M. Abala
• Data de Publicação: 1997
• Outros Autores: Vieira, Marco André, Vieira, Clibas, Grattapaglia, Dário
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UCB
• Texto Completo: http://twingo.ucb.br:8080/jspui/handle/10869/649; https://repositorio.ucb.br:9443/jspui/handle/123456789/7508
• topic: Embryo sac; RAPD; Interspecific hybrid

In cassava, apomixis fixes heterosis and avoids transmission of systemic pathogens which complicate vegetative propagation of the crop. Acombination of evidence from maternal inheritance of RAPDmarkers and the structure of the embryonic sac in large progeny sets of two distinct genotypes have further confirmed the occurrence of apomixis in cassava.We could advance further on earlier reports of the detection of apomixis in four ways: (1) we could arrive at an estimate of the rate of facultative apomixis in the range of 2%; (2) we detected the occurrence of apomixis in a second genotype, derived from a different interspecific cross; (3) apomictic behavior was demonstrated in an F1 individual and (4) parallel embryonic evidence was generated that corroborate the potential occurrence of apomixis by apospory. The fact that apomixis was detected in an F1 interspecific hybrid hints to the possibility of directly transferring genes for apomixis from a wild relative to cultivated cassava.