| MACKEY (1954) stated in his research work on the Spelta problem
that T. carthlcium is the only 4x species with the so called Q-factor,
the suppressor of the typical spelt characteristics ; Q is present
in all free threshing hexaploid wheats and is located on chromosome IX of
the B-genome. According to SEARS (1956) T. carthlicum differs from
T. dicoccum by the same gene Q as distinguishes T. aestivum
ssp. vulgare from ssp. spelta. These facts might give support
to the proposed hypothesis that the 6x ssp. carthlicoides should
be considered as the original and elder genotype from which genes for the
particular morphology of the ear were transferred together with the Q-factor
to T. carthlicum. The prolongation of the glume awns in T. carthlicum
might be due to the interaction of genes resp. the lack of the D-genome.
Acknowled gement I am grateful for the support of Mrs. Dr. Eva FUCHS, Braunschweig, in resistance-testing, of Mrs. Ruth PETERS in chromosome counting and last but not least to the Turkish Sugar Trust for transportation and guidance. Literature Cited SEARS, E.A. 1956. The Systematics. Cytology and Genetics of Wheat Handbuch der Pflanzen-zuchtung Vol. II, p. 164 ff. Verlag Paul Parey in Berlin und Hamburg MACKEY, J. 1954. Neutron and X-ray experiments in wheat and a revision of the speltoid problem ; Hereditas 40, 65-180 SCHIEMANN, E. 1948. Weizen, Roggen, Gerste Verlag Fischer, Jena |
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