Data/hora: 09/06/2024 10:21:53

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 14/04/2004
Data da última atualização: | 14/04/2004
Autoria: | SECOND, G.
Título: | Manihot glazovii, an example for a proposed dynamic conservation of cassava genetic resources.
Ano de publicação: | 1998
Fonte/Imprenta: | Revista Brasileira de Mandioca,Cruz das Almas, v.17, p.18, nov, 1998. Suplemento.
Idioma: | Inglês
Conteúdo: | Abstract: Arbitrary molecular markers (AFLP  tm, in this case) confirmed that M. esculenta subssp flabellifolia and peruviana are the direct ancestors of cassava but also pointed out that some other species have likely contributed to the genetic diversity of cassava . Among these, M. glazovii 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 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 though spontaneous hybridization, and 3) it was used in modern breeding work as a progenitor of cassava varieties with resistance to both bacterial blight and African mosaic virus. An interesting point is that some of these recently bred varieties cannot be distinguished from some regular cultivars on the basis of molecular markers so far analyzed. This raises the possibility that M. glazovii has also contributed to the diversity of some Brazilian land races. Still, molecular markers show that M. glazovii (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. glazovii is thus not only a proven genetic resource for cassava, although a species distantly related, but is genetic diversity and distribution have evolved under human distrubance in a way that exemplifies 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 - (20931-1) - ADD - AP - -- - 633.68205 -  -  - DIS