Two wheat cultivars that consistently show high levels of grain α-amylase at harvest ripeness, in the absence of preharvest sprouting, were crossed with a control, low α-amylase cultivar, and F1, F2 and BC1 populations were developed. Grain of these populations was analysed for α-amylase activity at harvest ripeness. Distribution and segregation patterns were consistent with control at a single locus with high α-amylase the recessive allele. This mode of inheritance would make it extremely difficult to differentiate homozygous low α-amylase lines from heterozygotes (low α-amylase phenotype but carriers of high α-amylase) and has important implications for wheat breeders. High α-amylase, termed late maturity α-amylase, was not linked with the awned inhibitor gene, B2, located on the long arm of chromsome 6B.
Key wordsinheritance late maturity α-amylase wheat Triticum aestivum
Unable to display preview. Download preview PDF.
- Gale, M.D., 1989. The genetics of preharvest sprouting in cereals, particularly in wheat. In: N.F. Derera (Ed). Preharvest Field Sprouting in Cereals. pp. 85–110. CRC Press Inc., Boca Raton, Fl., USA.Google Scholar
- Mares, D.J. & M.D. Gale 1990. Control of α-amylase synthesis in wheat grains. In: K. Ringlund, E. Mosleth & D.J. Mares (Eds). Proceeedings of the Fifth International Symposium on Pre-Harvest Sprouting in Cereals. pp. 183–194. Westview Press, Boulder, Co., USA.Google Scholar
- Mares, D.J. & K. Mrva, 1993. Late maturity α-amylase in wheat. In: M.K. Walker-Simmons & J.L. Reid (Eds). Proceedings of the Sixth International Symposium on Pre-Harvest Sprouting in Cereals. pp. 178–184. AACC, St. Paul, Mn., USA.Google Scholar
- Mares, D.J., K. Mrva & J.F. Panozzo, 1994. Characterization of the high α-amylase levels in grain of the wheat cultivar, BD 159. Austr. J. Agric. Res. 45: 1003–1011.Google Scholar
- McCleary, B. & H. Sheehan, 1989. Measurement of cereal α-amylase: A new assay procedure. J. Cereal Sci. 6: 237–251.Google Scholar
- McIntosh, R.A., 1988. Catalogue of gene symbols for wheat. In: T.E. Miller & R.M.D. Koebner (Eds). Proceedings of the Seventh International Wheat Genetics Symposium. pp. 1225–1323. Cambridge, England.Google Scholar
- Sears, E.R., 1954. The aneuploids of common wheat. Missouri Agric. Exp. Stn. Res. Bull. 572: 58–59.Google Scholar
- Tsunewaki, K., 1966. Comparative gene analysis of common wheat and its ancestral species. III. Glume hairiness. Genetics 53: 303–311.Google Scholar