Data/hora: 09/06/2024 12:42:01

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 14/04/2004
Data da última atualização: | 14/04/2004
Autoria: | SECOND, G.
Título: | Manihot glaziovii: evidence for its spontaneous introgression in cassava and illustration of its dynamic conservation around the tropics.
Ano de publicação: | 1998
Fonte/Imprenta: | Revista Brasileira de Mandioca,Cruz das Almas, v.17, p.19, nov, 1998. Suplemento.
Idioma: | Inglês
Conteúdo: | Abstract: Molecular markers (RAPD and AFLP, in our case) confirmed that M. esculenta subssp flabellifolia and peruviana are the direct ancestors of cassava but also pointed out that some other species have lakely contributed to the genetic diversity of cassava. Among these, M. glaziovii is particularly interesting because 1) it forms spontaneous hybrids with cassava that are often grown in fences or as shade trees in the surroundings of fields and houses and that sometimes can yield large quantities of roots for human consumption, particularly in the North-East of Brazil, 2) it was introduced in Africa and Asia at the end of the last century, is often found there in the same situation as described above for North-East Brazil and also gave rise to new African cultivars through spontaneous hybridization, 3) it was used in modern breeding work as a progenitor of cassava varieties with resistance to both bacterial blight and African mosaic virus, 4) molecular markers show particular similarities between a cultivar artificially introgressed, a cultivar presumed spontaneously introgressed and several cultivars selected in modern time, and 5) molecular markers show that M. glaziovii (along with some other species with affinity, i.e. M. carthaginensis s. I.) is, among brasilian species, the species with the largest genetic distance from cassava. M. glaziovii is thus not only a proven genetic resource for cassava, although a species distantly related, but its genetic diversity and distribution have evolved under human disturbance in a way that illustrates a proposed dynamic management coupled with an increased utilization of cassava genetic resources.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (20932-1) - ADD - AP - -- - 633.68205 -  -  - DIS