| New botainical sphaerococcum varieties in T. aestivum
obtained as a result of EMS treatment S. GEORGIEV Department of Genetics, Faculty of Biology-Sofia University, Bulgaria Affter treatment of seeds of T. aestivum variety Sadovska rarnozreika 2, several sphaerococcum mutants have been induced (Georgiev 1976). Among these mutants four hexaploid varieties with typical sphaerococcum phenotype have also been identified. Two other sphaerococcum varieties separated in F2 after crossing sphaerococcum mutants No 613 and No 6512 with the original variety Sadovska ranozreika 2 have been reported. These mutants were analysed as regard the phenotype and genotype differentiation through the next 6 generations (F7). On the basis of the existing morphological classification of T. sphaerococcum Perc., (DOROFEEV & KOROVlNA 1979) and taxonomic criterion suggested by GANDILIAN (1980), we established the varietal diversity among sphaerococcum form in T. aestivum obtained. In order to avoid systematical and botanical duplication among the representatives of the hexaploid and tetraploid groups of sphaerococcum mutant forms, we decided all the hexaploid sphaerococcum mutant forms possessing the described typical characters for the respective variety of the T. sphaerococcum Perc., to have the same name of this variety plus the suffix "haxa"-e.g. hexa-rubroaristatum. A new name was given to all new varieties as follows: 1. T. sphaerococcum var. hexa-ethasulfonicum popovii* 1982 (var. nov.). Plantae spicis ruberis pubibus aristis nigris, granis rubris. Bearded and pubescent ear, red glumes with black awns and red grains. It is obtained after EMS treatment of T. aestivum as a sphaerococcum mutant forms and is characterized by a high sterility (up to 10%). Probably this is due to a structural change in the chromosome set. 2. T. sphaerococcum var. hexa-ethasulfonicum nicolovii* (var. nov.). Plantae spicis ruberis pubibus, aristis nigeris, granis albis. Bearded and pubescent ear, red glumes with red awns and white semispherical grains (Fig. 1, 2). It is induced after EMS treatment of T. aestivum variety Sadovska ranozreika 2. 3. T. sphaerococcum hexa-rubroaristatum. Plantae spicis ruberis pubibus, aristis rubris, granis rubris. Bearded and pubescent ear, red glumes with red awns and red semispherical grains. (Fig. 1, 2). It is induced after EMS treatment. 4. T. sphaerococcum var. hexa-pakistanicum. Plantae spicis ruberis pubibus, aristis rubris, granis albis. Bearded and pubescent ear, red glumes with red awns and white grains. It is induced after EMS treatment. |
| * Dedicated to acad P. Popov on the occasion of his 80th Birthday.
** Dedicated to my teacher of genetics proff. Dr. H. Nicoloff. |
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