CDC Weaver

Oat

Variety Description

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

Summary: 'CDC Weaver' has denser pubescence of the lower leaf blade than 'CDC Orrin' but sparser than 'AC Assiniboia'. The pubescence of the leaf margin in 'CDC Weaver' is sparser than in 'AC Assiniboia'. 'CDC Weaver' has lower frequency of plants with recurved/drooping flag leafs than 'AC Assiniboia'. The flag leaf of 'CDC Weaver' is longer than in 'CDC Dancer' and 'CDC Orrin'. 'CDC Weaver' has denser pubescence of the stem above and below the upper culm node than 'CDC Orrin'. The panicle of 'CDC Weaver' is slightly longer than the reference varieties. 'CDC Weaver' has fewer, shorter hairs or spines on the lowest panicle node than 'AC Assiniboia'. The length of the rachilla between the primary and secondary floret of 'CDC Weaver' is longer than in 'AC Assiniboia' and 'CDC Orrin'. 'CDC Weaver' has shorter grooves of the rachilla than 'CDC Dancer' and 'CDC Orrin'. The lower glume of 'CDC Weaver' is slightly longer than in 'CDC Dancer' and 'CDC Orrin'. 'CDC Weaver' has a longer lemma than 'CDC Dancer' and 'CDC Orrin'. The glaucosity of the lemma of 'CDC Weaver' is weaker than in 'CDC Dancer'. 'CDC Weaver' has a weaker tendency to be awned than 'AC Assiniboia' and 'CDC Orrin'. The kernel of 'CDC Weaver' is slightly longer than in 'CDC Dancer' and 'CDC Orrin'. 'CDC Weaver' has denser groat pubescence than 'CDC Dancer' and 'CDC Orrin'.

Description:

PLANT: intermediate juvenile growth habit, medium to dense pubescence on the lower leaf sheath, sparse to medium pubescence on the lower leaf blade, medium green colour, very sparse to sparse pubescence on leaf margin, strong glaucosity of the leaves

FLAG LEAF: medium frequency of plants with recurved/drooping, dense pubescence of the stem above and below the upper culm node

PANICLE (just after heading): equilateral orientation, medium density, semi-erect to horizontal attitude of the branches, 30-45 degrees between the rachis and the dominant side branch, medium number of medium length spines at the lowest node

SPIKELET: fracture separation, nodding attitude
RACHILLA (at maturity): long length between the primary and secondary floret, short to medium length grooves, medium pubescence
GLUME: medium glaucosity
LEMMA: yellow colour, sparse pubescence on the lateral and dorsal surface, weak glaucosity, small to medium overlap on palea, absent to very weak tendency to be awned

KERNEL (primary kernels from upper spikelets): short basal hairs, cream to yellow colour, two grains per spikelet, pointed tip to the medium sized scutellum, dense groat pubescence

DISEASE RESISTANCE: susceptible to Barley Yellow Dwarf Virus (BYDV), resistant to Crown Rust (Puccinia coronata), Stem Rust (Puccinia graminis f. sp. avenae, Races NA8, 16, 25, 27, 55), Black Loose Smut (Ustilago avenae, Races A13, 60 617) and Covered Smut (Ustilago kolleri).

AGRONOMY: fair to good lodging resistance, good shattering resistance, day-light sensitive

Origin & Breeding History: 'CDC Weaver' was developed by the Crop Development Centre's oat breeding program using a pedigree breeding system. It originates from the cross OT369 x W95116 made at the Crop Development Centre in 1997. The F1 generation was grown as a bulk population in a winter nursery in New Zealand and the subsequent F2 was grown as a bulk population in Saskatoon, Saskatchewan in 1998. The F3-F4 generations were grown as single seed derived lines during the winter of 1998 and 1999 where 'CDC Weaver' was grown and selected in the field as a F5 hill plot in Saskatoon, Saskatchewan in 1999. The seed from the F5 hill plot was bulked as the line that became 'CDC Weaver'. It was tested in CDC yield trials in 2000-2001, followed by testing in the Western Canadian Oat Cooperative Trials during 2002 and 2003. Selection criteria included grain and milling yield, kernel plumpness, kernel weight and disease resistance.

Tests & Trials: Test and trials were conducted in Saskatoon, Saskatchewan during the summers of 2004 and 2005. Plots consisted of 3 rows, 3.7 metres in length, 2 replicates arranged in a RCB design.

Comparison tables for 'CDC Weaver' with reference varieties 'AC Assiniboia', 'CDC Dancer' and 'CDC Orrin'

Flag leaf length (cm)

Panicle length (cm)

Lower glume length (mm)

Lemma length (mm)

Kernel length (mm)

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Oat: 'CDC Weaver' (right) with reference varieties 'AC Assiniboia' (left), 'CDC Dancer' (center left) and 'CDC Orrin' (center right)

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Oat: 'CDC Weaver' (left) with reference varieties 'AC Assiniboia' (center left), 'CDC Dancer' (center right) and 'CDC Orrin' (right)