Spectroscopy

99/00651   Predicting the number of dominant R alleles in single wheat kernels using visible and near-infrared reflectance spectra. Wang D., Dowell F.E., Lacey R.E. Cereal Chemistry, 1999, 76, Jan.-Feb., 6-8.

An optical radiation measurement system was used to measure reflectance spectra of single wheat kernels from 400 to 2,000 nm. A total of 18 wheat samples with 0, 1, 2 or 3 R alleles for red grain colour was used for this study. The results indicated a linear relationship between the degree of red pigmentation and the number of R alleles. The number and combination of R alleles had a significant effect on wheat kernel colour. These relationships may be useful to wheat breeders in estimating the number and location of R alleles. (Shortened authors’ abstract.) (18 references.) A.C.G.

99/00652   Single wheat kernel color classification by using near-infrared reflectance spectra. Wang D., Dowell F.E., Lacey R.E. Cereal Chemistry, 1999, 76, Jan.-Feb., 30-33.

An optical radiation measurement system, which measured reflectance spectra, log (1/R), from 400 to 2,000 nm, was used to quantify single wheat kernel colour. Six classes of wheat samples were used for this study, including red wheat that appears white and white wheat that appears red. Partial least squares regression and multiple linear regression were used to develop classification models with three wavelength regions and three data pretreatments. (Shortened authors’ abstract.) (9 references.) A.C.G.

99/00653*  Use of EPR spin probe technique for detection of irradiated wheat. Sünnetçioglu M.M., Dadayli D., Çelik S., Köksel H. Applied Radiation and Isotopes, 1999, 50, No.3, 557-560.

The electron paramagnetic resonance (EPR) spin probe technique has previously been shown to successful in detecting wheats irradiated at 10 and 20 kGy absorbed and this work has now been extended to include lower doses. The lower limit of detection has been reduced to 2.5 kGy and it has also been confirmed that the detection of wheat samples irradiated at 10 kGy after eight months of storage is feasible. (13 references.) P.D.C.