| By the minor reciprocal translocation carried by 108-2 and 108-3, strains
of T. dicoccoides were classified into the two subtypes, E1a
and E1b, and an unidentified group (Table
3). Twelve of the 38 strains used in the present study belonged to type
E1a and two to E1b. Of the two subtypes of E1,
E1b was restricted to a single locality, Sueida in Syria, but
E1a was found in six localities in Turkey, lraq and lran. The wide geographical distribution of E1a Strongly suggests that it is the fundamental chromosome structure of type E1. Since type E1 is believed to be the fundamental chromosome structure of T. dicoccoides (Kawahara and Tanaka 1981, 1983), E1a may be the most fundamental and primitive chromosome structure of this species. Acknowledgement Thanks are due to Dr. M. Tanaka for his critical reading of the manuscript. References KAWAHARA, T.1984. Studies on intraspecific structural differentiation of chromosomes in the wild tetraploid wheats. Doctoral Dissertation, Faculty of Agriculture, Kyoto University, Kyoto. KAWAHARA, T.and TANAKA, M.1978. Identification of reciprocal translocation chomosome types in the emmer wheats. I. Triticum dicoccoides Korn. Wheat Inform. Serv. 45, 46: 29-31. KAWAHARA, T. and TANAKA, M. 1981 . Intraspecific differentiation in chromosome structures of the wild tetraploid wheats. Wheat Inform. Serv. 52: 33. (Abstract) KAWAHARA, T. and TANAKA, M. 1983. Chromosomal interchanges and the evolution of the B and C genomes. Proc. 6th Int. Wheat Genet. Symp., Kyto: 977-981. |
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