A tester-set of translocations in Gossypium hirsutum L. [Cotton]

The chromosomes in 62 translocations of Gossyplum hirsutum L. were identi fied over a period of years by Dr. M. S. Brown in Texas. The use of some of these translocation lines has given conflicting results, Indicating that either the chromosomes in certain lines were identified incorrectly, or that the purity or lineage of the seed lines is questionable. A tester-set consisting of 20 translocation lines, which identifies all 26 chromosomes of cotton, was selected for reidentificatlon of their chromosomes. Results showed that, except for one line, the chromosomes involved in each translocation of the tester-set were the same as originally identified.