O uso de haplóides de algodoeiro em cruzamentos interespecíficos

Haploid cotton plants (n = 26 chromossomes) from the semigametic virescent lines 73-4003 and 74-4116 ( Gossypium barbadense L.) with genetic marker virescent 7 were used as female in crosses with normal (2n = 4x = 52 chromossomes) Upland varieties ( Gossypium hirsutum L.). All crosses were feasible and produced trilocular bolls with one seeded boll but one which produced two seeds. These seeds had normal germination and the F 1 plants exhibit good development. The phenotype of the F 2 generation resembled normal interspecific hybrids and the segregation of three plants normal green to one virescent 7, indicated that crosses involving haploids plants as female with Upland ( Gossypium hirsutum L.) diploid plants yielded a hybrid progeny like in crosses with diploid x diploid.