ARS | Publication request: EVALUATION OF KERNEL CHARACTERISTICS OF THE USDA RICE CORE COLLECTION

Submitted to: Arkansas Agricultural Experiment Station Research Series
Publication Type: Experiment Station
Publication Acceptance Date: March 1, 2005
Publication Date: August 10, 2005
Citation: Yan, W., Rutger, J.N., Bockelman, H.E., Tai, T. 2005. Evaluation of kernel characteristics of the USDA rice core collection. In: Norman, R.J., Meullenet, J.-F., Moldenhauer, K.A.K., editors. B.R. Wells Rice Research Studies 2004, Arkansas Agricultural Experiment Station Research Series 529. p. 69-74. Available: http://www.uark.edu/depts/agripub/Publications/researchseries/

Technical Abstract: Grain type in rice usually is associated with specific milling, cooking and processing characteristics. Kernel dimensions, weight and color of 1,615 accessions in the USDA rice core collection were evaluated using the GrainCheck 2312 (Foss Tecator). Sample size of rough rice varied from 100 to 732 grains. Hull colors of 67 accessions (4.1%) were white, 814 (50.4%) straw, 123 (7.6%) gold, 57 (3.5%) russet, 85 (5.2%) furrowed, 449 (27.8 %) spotted or piebald, 16 (1%) purple, and 4 (< 1%) black. Grain length ranged from 5.9 to 13.0 mm with an average of 8.7'0.9 mm, and width from 2.2 to 4.4 mm with an average of 3.1'0.4 mm. Ratio of length to width ranged from 1.7 to 4.4 with an average of 2.8' 0.5 cm, and 1000 grain weight from 12.5 to 42.7 g with an average of 26.2' 4.4 g. Brown rice sample sizes ranged from 78 to 862 kernels. Seed bran colors of 54 accessions (3.3%) were white, 1357 (84.0%) light brown or speckled brown, 58 (3.6%) brown, 144 (8.9%) red and 2 (< 1%) purple. Length ranged from 4.2 to 10.0 mm with an average of 6.5' 0.8 mm, and width from 1.5 to 3.5 mm with an average of 2.6' 0.3 mm. Ratio of length to width ranged from 1.5 to 4.5 with an average of 2.7' 0.5, and 1000 kernel weight from 9.5 to 37.4 g with an average of 21.4' 3.7 g. There were 282 accessions (17.5%) short, 1036 (64.1%) medium, and 297 (18.4%) long grain types in the accessions evaluated.