Publication no. C-2002-0604-05R |  VIEW ARTICLE

Sources of Variation in Oat Kernel Size.

Douglas C. Doehlert (1,2), Michael S. McMullen (3), and Neil R. Riveland (4). (1) USDA-ARS Hard Red Spring and Durum Wheat Quality Laboratory, Harris Hall, North Dakota State University, Fargo, ND 58105. Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by the USDA implies no approval of the product to the exclusion of others that may also be suitable. (2) Corresponding author. E-mail: <douglas.doehlert@ndsu.nodak.edu> Phone: (701) 231-8069. Fax: (701) 239-1377. (3) Department of Plant Sciences, Loftsgard Hall, North Dakota State University, Fargo, ND 58105. (4) Williston Research Extension Center, 14120 Highway 2, Williston, ND. Cereal Chem. 79(4):528-534. Accepted January 30, 2002. This article is in the public domain and not copyrightable. It may be freely re­printed with customary crediting of the source. American Association of Cereal Chemists, Inc., 2002.

Oat kernel size uniformity is important to the oat milling industry because of the size fractionations that occur in the milling process. We measured frequency of single, double, and triple kernel spikelets and kernel mass of primary, secondary, and tertiary kernels from each spike­let type (for a total of six kernel types) to determine relative influence of kernel type, panicle position, genotype, and environment on oat kernel size for 10 oat cultivars grown at four locations. Kernel type was the most important factor affecting kernel size. Primary kernels from triple kernel spikelets were larger than primary kernels from double kernel spikelets. Tertiary kernels were the smallest. Environments that produced larger kernels also produced higher frequencies of triple kernel spikelets. Some genotypes produced no triple kernel spikelets in any environment, whereas others produced varying proportions, depending on the environ­ment. Kernels closer to the top of the panicle were larger than those near the base. The presence of tertiary kernels was neither associated with lower groat percentages nor with increased proportions of undersized kernels. Most undersized kernels were kernel types other than tertiary.