Abstract
The formation of naked grains is directly associated with the formation of multiflorous spikelets in oats. The objectives of this study were to determine the genetics of multiflorous spikelet and to identify molecular markers linked to this character in hexaploid oat. Genetic analysis for multiflorous spikelet was performed in the F5 and F6 generations of two oat populations. DNA extracted from F5:6 plants were assayed with 6,000 genome-wide single nucleotide polymorphism (SNP) markers using a genotyping platform developed for oat. Genetic analysis indicated the presence of a major gene controlling multiflorous spikelet in the UFRGS 01B7114-1-3 x UFRGS 006013-1 population. The SNP marker GMI_ES17_c5923_221 showed strong association with the multiflorous spikelet phenotype. These results suggest that the marker GMI_ES17_c5923_221 should be linked to a gene controlling multiflorous spikelet in the oat lines evaluated in this study.
Highlights
Oat is an important cereal crop used for food and feed worldwide
The objectives of this study were to determine the genetics of multiflorous spikelet and to identify molecular markers linked to this character in hexaploid oat
DNA extracted from F5:6 plants were assayed with 6,000 genome-wide single nucleotide polymorphism (SNP) markers using a genotyping platform developed for oat
Summary
Oat is an important cereal crop used for food and feed worldwide. Oat is adapted to a wide variety of environments; this crop grows mainly in temperate regions or in the cold seasons of subtropical regions such as southern Brazil (Locatelli et al 2008). Cultivated oat, Avena sativa L., belongs to the Poaceae family. This species is autogamous, allohexaploid (2n = 6x = 42) and derived from the natural aggregation of the three ancestral diploid genomes AA, CC and DD (Rines et al 2006). In addition to cultivated hulled oat, the species Avena sativa subsp. This species known as ‘naked oat’ differs from hulled oat in that the naked grain threshes free (Ougham et al 1996). Another striking difference in naked oat is the presence of panicles with indeterminate multiflorous spikelets. Multiflorous spikelets are found in other species of agricultural interest, including rice (Oryza sativa L.), barley (Hordeum vulgare L.) and maize (Zea mays L.) (Chuck et al 2007, Lee et al 2007, Brown and Bregitzer 2011)
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