The primary gene pool of cassava (Manihot esculenta Crantz).

A crop gene pool comprises three distinct categories of gene suppliers, primary, secondary, and tertiary gene pools. The primary gene pool (GP-1) is composed of gene reservoirs that cross easily with the domesticate and the crosses produce fertile offspring regularly. The secondary (GP-2) and tertiary (GP-3) gene pools comprise gene sources that cross with variable degrees of diffilculty with the crop species, this implies less close genetic distances. The GP-1 is further subdivided in cultivated and wild gene pools. The cultivated gene pool englobes commercial stocks of the crop besides indigenous landraces and folk varieties of the domesticate. The wild GP-1 of a crop comprises putative ancestors and closely related species that show a fair degree of fertile relationships with the domesticate. Two Douth American wild subspecies of cassava (M. flabellifolia and M. peruviana) are natural members of the wild GP-1 of the species. Another Brazilian species (M. pruinosa) is so close morphologically to the two wild subspecies of cassava that it may turn out another member of the wild GP-1 of the indigen. The GP-2 of cassava is more difficult to delimit as few species have been tested for genetic compatibility. Biosystematic crosses carried out between the crop and a number of wild species suggest a dozen of them as components of the GP-2, the majority are Brazilian species.

Bibliographic Details

Main Authors:	ALLEM, A. C., ROA, A. C., MENDES, R. A., SALOMAO, A. N., BURLE, M. L., SECOND, G., CARVALHO, P. C. L. de, CAVALCANTI, J.
Other Authors:	JOSIAS CAVALCANTI, CPATSA.
Format:	Parte de livro biblioteca
Language:	English eng
Published:	2000-11-30
Subjects:	Biotecnology., Mandioca, Biotecnologia, Espécie, Manihot Esculenta, Taxonomia., Cassava.,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/134074
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