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Translocation Homozygotes in Safflower Identification and Frequency of Chromosomes Involved in the Interchanges¹

Ten translocation homozygotes in safflower (Carthamus tinctorius L.) were established. The chromosomes involved in each interchange homozygote were identified through karyotype analysis by comparing the relative chromosome length (L%) and arm ratio (Pa-value) with that of the standard line ‘I.C. 11842’. The chromosomes interchanged were 6-8 (line 58), 1-3 (line 66), 3-12 (line 123), 3-10 (line 131), 3-6 (line 153), 4-6 (line 186), 4-8 (line 197), 3-8 (lines 208, 279) and 5-9 (line 290). The segment interchanges were not random, chromosome 3- (satellite-chromosome) was involved in 6 of the 10 translocations.

Key Words: Karyotype • Gamma-irradiation • Carthamus tinctorius L.

² Research scholar, junior breeder, and professor; the last presently IBPGR regional officer (SE Asia), FAO, RAPA, Bangkok.

Received for publication July 21, 1980.