CDC SO-I

Oat

Variety Description

Varieties used for comparison: 'CDC Dancer' and 'AC Assiniboia'

Summary: 'CDC SO-I' has weaker pubescence on the lower leaf sheath, lower leaf blade, leaf margins and above and below the upper culm node than 'AC Assiniboia'. The frequency of plants with recurved flag leaves is higher in 'CDC SO-I' than 'CDC Dancer'. 'CDC SO-I' heads earlier than 'CDC Dancer' and 'AC Assiniboia'. At maturity, the length of the rachilla grooves of 'CDC SO-I' are longer than 'AC Assiniboia'. 'CDC SO-I' has a stronger tendancy to be awned on the lemma than either 'CDC Dancer' or 'AC Assiniboia'. The kernel of 'CDC SO-I' has basal hairs while 'CDC Dancer' does not.

Description:

PLANT: hulled, spring type, low acid detergent lignin hull, high oil groat

SEEDLING: semi-erect to intermediate juvenile growth habit, sparse to medium pubescence on the lower leaf sheath, medium pubescence on lower leaf blade

LEAF: medium green, medium to dense pubescence on margins, medium to strong glaucosity, high frequency of plants with recurved flag leaves, medium to dense pubescence above and below the upper culm node

PANICLE: equilateral orientation, medium to dense density, semi-erect attitude of branches, 30 to 45 degree angle between rachis and dominant side branch, medium to many medium to long hairs or spines on the lowest panicle node

SPIKELET: fracture separation, nodding attitude, two grains per
RACHILLA: medium to long length between primary and secondary floret, medium to long grooves, very sparse to sparse pubescence
GLUME: medium to strong glaucosity
LEMMA: yellow to reddish brown colour, sparse pubescence on lateral and dorsal surface, medium to strong glaucosity observed at the green stage, medium to large overlap on palea, strong tendancy to be awned
KERNEL: mid-long basal hairs present, yellow to light brown colour, pointed tip of scutellum, medium sized scutellum, dense pubescence of the groat

REACTION TO DISEASES: resistant to Black Loose Smut (Ustilago avenae, races A13, 30, 617), moderately resistant to moderately susceptible to Stem Rust (Puccinia graminis f. sp. avenae, races NA8, 16, 25, 27, 28, 55, 67), moderately susceptible to Barley Yellow Dwarf virus (BYDV), susceptible to Crown Rust (Puccinia coronata, races CR13, 192, 181, 185, 223, 225)

AGRONOMY: good lodging resistance, sensitive to day-length

Origin & Breeding History: 'CDC SO-I', experimental designation OT3017, was developed by the Crop Development Centre's oat breeding program, University of Saskatchewan, Saskatoon, Saskatchewan using a pedigree breeding system. It originated from the cross AC Assiniboia x SA96121 made in the spring of 2000 at the Crop Development Centre, Saskatoon, Saskatchewan. The F1 generation was increased in the summer of 2000. The F2 and F3 generations were advanced during the winter of 2000 and 2001 in greenhouses using the Single seed descent method. OT3017 was grown and selected as a single F4 plant at Saskatoon, Saskatchewan in 2001. The seed from that F4 plant was bulked to become OT3017. The F5 generation was grown in a New Zealand winter nursery during 2001 and 2002. The new variety was tested in Crop Development Centre yield trials in 2002 and 2003, and in the Rust Area Trial in 2004 as SO02174, followed by testing in the Western Regional Oat Cooperative trials as OT3017 during 2005. Selection criteria for OT3017 included high yield potential, early maturity, straw strength, disease resistance, and grain quality including the combination of low acid detergent lignin hull (LLH) and high oil groat (HOG) characteristics.

Tests & Trials: Test and trials were conducted during the summers of 2006 and 2007 in Saskatoon, Saskatchewan. Plots consisted of 5 rows per variety with a row spacing of 15 centimetres and a row length of 3.7 meters. There were 2 replicates arranged in a RCB design.

Comparison table for 'CDC SO-I' with reference varieties 'CDC Dancer' and 'AC Assiniboia'

Days to heading

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Oat: 'CDC SO-I' (left) with reference varieties 'CDC Dancer' (centre) and 'AC Assiniboia' (right)