Relationships between Manihot species : a review
1995
Nassar, Nagib M.A.
Ninety-eight species are recognized within the genus Manihot. Only one species is known within the closest related genus, Manihotoides. Taxonomically, Manihot species are divided into 19 sections, which vary from tall shrubs to acaulescent subshrubs. All the species studied had a chromosome number of 2n = 36. Meiotic behaviour is regular for pairing and fertility. Natural hybridization is frequent between Manihot species, and introgression accompanies hybridization and contributes to expanding the geographic limits of certain species. Electrophoresis analysis of soluble seed protein revealed a close relationship between cassava and some wild Manihot species, such as M. pilosa. The occurrence of interspecific hybrids between cassava and M. glaziovii, M. pseudoglaziovii, M. dichotoma, M. cearulescens, M. pohlii, M. neusana, M. tripartita, M. pilosa, M. corymbiflora, M. aesculifolia and M. anomala is low, and a secondary gene pool relationship exists.
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