Abstract
The inheritance of rachis fragility and glume tenacity in semi-wild wheat was studied in an attempt to help establish the taxonomic status and genetic origin of semi-wild wheat. Progenies of crosses and backcrosses of semi-wild wheat with the cultivar Columbus (common wheat) indicated that the fragile rachis and non-free-threshing character of semi-wild wheat were dominant to the tough rachis and free-threshing character of common wheat. F2 and backcross data indicated that the rachis fragility and glume tenacity of semi-wild wheat were each controlled by a single gene in the cross of semi-wild wheat with Columbus. In the cross of semi-wild wheat with Triticum aestivum spp. spelta, the F2 and F3 population did not segregate for glume tenacity, but did segregate for rachis fragility. The F2 and backcross data suggest that three genes interact to control three types of rachis fragility, i.e. semi-wild wheat-type, spelta-type and the tough rachis of common wheat. Semi-wild wheat differs from common wheat in rachis fragility and glume tenacity. This wheat also differs from other wheats with fragile rachis and tenacious glumes (T. aestivum ssp. spelta, macha and vavilovii) in the pattern and degree of rachis disarticulation. We conclude that semi-wild wheat is likely a subspecies within T. aestivum at the same taxonomic level as spp. spelta, macha and vavilovii.
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References
Barnes, R.F. & J.B. Beard, 1992. A Glossary of Crop Science Terms. Crop Science Society of America, Inc, 667 South Segoe Road, Madison, USA.
Boshnakian, S., 1923. The relation of the spelt factor in wheat to rachis internode characters. Genetics 8: 261–275.
Chen, P.D., D.J. Liu, G.Z. Pei, L.L. Qi & L. Huang, 1988. The chromosome constitution of three endemic hexaploid wheats in Western China. Proc 7th Intern Wheat Genet Symp Cambridge, England. pp: 75–80.
Kabarity, A., 1966. On the origin of the new cultivated wheat II. Cytogenetical studies on the karyotypes of some Triticum macha varieties. Beitr Biol Pflanzen 42: 339–346.
Kerber, R.E. & G.G. Rowland, 1974. Origin of the threshing character in hexaploid wheat. Can J Genet Cytol 16: 145–154.
Kimber, G. & E.R. Sears, 1983. Assignment of genome symbols in Triticeae. Proc 6th Intern Wheat Genet Symp Kyoto, Japan. pp: 1195–1196.
Leighty, C.E. & S. Boshnakian, 1921. Genetic behaviour of the spelt form in crosses between Triticum spelta and Triticum aestivum. J Agri Res 7: 335–364.
MacKey, J., 1954. Neutron and X-ray experiments in wheat and a revision of the speltoid problem. Hereditas 40: 65–180.
MacKey, J., 1966. Species relationships in Triticum. Proc 2nd Intern Wheat Genet Symp (Hereditas Suppl.) 2: 237–276.
Sears, E.R., 1946. The sphaerococcum gene in wheat. Rec Genet Soc Amer 15: 65–66.
Shao, Q., C. Li & C. Basang, 1980. Semi-wild wheat from Xizang (Tibet). Acta Genetica Sinica 7(2): 149–156.
Shao, Q., C. Li & C. Basang, 1983. Semi-wild wheat from Xizang (Tibet). Proc 6th Intern Wheat Genet Symp Kyoto, Japan. pp: 111–114.
Singh, H.B., E. Anderson & B.P. Pal, 1957. Studies in the genetics of Triticum vavilovii Jackub. Agron J 49: 4–11.
Unrau, J., 1950. The use of monosomics and nullisomics in cytogenetic studies of common wheat. Sci Agr 30: 66–89.
Watkins, A.E., 1928. The genetics of wheat species crosses. J Genet 20:-27.
Watkins, A.E., 1940. The inheritance of glume shape in Triticum. J Genet 39: 249–264.
Zohary, D. & M. Hopf, 1988. Domestication of plants in the old word. Clarendon Press. Oxford.
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Cao, W., Scoles, G. & Hucl, P. The genetics of rachis fragility and glume tenacity in semi-wild wheat. Euphytica 94, 119–124 (1997). https://doi.org/10.1023/A:1002933608249
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DOI: https://doi.org/10.1023/A:1002933608249