Submitted to: American Association of Cereal Chemists Meetings
Publication Type: Abstract only
Publication Acceptance Date: 5/4/2004
Publication Date: 9/18/2004
Citation: Doehlert, D.C., Jannink, J.L., Mcmullen, M. 2004. Kernel size distributions in naked oats.. American Association of Cereal Chemists Meetings. AACC 2004 Annual Meeting Program Book, pg. 149. Interpretive Summary:
Technical Abstract: Oat kernel size uniformity is important to the oat milling industry because of the importance of kernel size to impact dehulling settings for optimal dehulling efficiency. Normal hulled oats appear to have bimodal distributions, which appear to be related to the architecture of the oat spikelet. Most oat spikelets have two kernels, where the primary kernel is distinctively larger than the secondary kernel. Naked oats have a different spikelet architecture, which is referred to as the "chevron" spikelet. Our analyses have indicated that spikelets from the ten naked oat genotypes we analyzed from three environments contained from one to six kernels. Single kernel and double kernel spikelets were the most abundant. Some genotypes had much larger chevron spikelets that others and these were more likely to produce five and six kernel spikelets. Normality analysis of size distributions indicated that all hulled oat genotypes and many naked genotypes had size distributions departing significantly from normality, but many naked genotypes had normal size distributions. Also, the variances of naked oat size distributions were much smaller that those of hulled genotypes, indicating a greater degree of uniformity in naked genotypes. A test for bimodality indicated that most of the naked genotypes were less bimodal in their distributions than the hulled lines. The results suggest that the chevron type oat spikelets may generate better uniformity for kernel size that the hulled oat spikelet.