AAC Rimbey

Wheat

Variety Description

Varieties used for comparison: 'AAC Penhold', 'AAC Ryley' and 'SY985'

Summary: The intensity of anthocyanin colouration for the coleoptile of 'AAC Rimbey' is absent or very weak whereas it is strong to very strong for 'AAC Penhold'. The intensity of anthocyanin colouration of the auricles on the flag leaf is absent or very weak for 'AAC Rimbey' whereas the intensity is medium for 'AAC Penhold'. The flag leaf of 'AAC Rimbey' is wider than that of 'SY985'. At heading, the culm of 'AAC Rimbey' has a medium degree of glaucosity whereas the glaucosity is strong on the culm of 'AAC Penhold'. At maturity, the plants, including the spike and awns, of 'AAC Rimbey' are taller than those of 'AAC Penhold'. The spike, excluding the awns, of 'AAC Rimbey' is shorter than that of 'AAC Ryley'.

Description:

PLANT: common wheat, spring type, intermediate, between semi-erect and semi-prostrate, growth habit at 5 to 9 tiller stage, high frequency of plants with recurved flag leaves, heads emerge mid-season

SEEDLING (4 LEAF STAGE): absent or very weak intensity of anthocyanin colouration of coleoptile, glabrous sheaths and blades of lower leaves

FLAG LEAF: absent or very weak intensity of anthocyanin colouration of auricles, medium glaucosity of sheath and lower side of blade, glabrous blade and sheath

CULM NECK: medium degree of glaucosity at heading
STRAW (AT MATURITY): thin pith in cross-section

SPIKE: medium glaucosity at heading, parallel sided shape in profile, medium to dense, white at maturity, erect attitude
AWNS: shorter than spike length, white at maturity
LOWER GLUME SHOULDER: narrow, sloping
LOWER GLUME BEAK: long, slightly curved shape

KERNEL: dark red

INSECT REACTION: resistant to Orange Wheat Blossom Midge (Sitodiplosis mosellana)

Origin & Breeding History: 'AAC Rimbey' (experimental designations as C1203-HQ*03 and HY2095) originated from the cross between 'SY985' and 'AAC Tenacious' followed by a cross with 'AAC Penhold' at the Swift Current Research and Development Centre of Agriculture and Agri-Food Canada in Swift Current, Saskatchewan. The final cross was made in 2012. In 2013, about 10,000 F2 seeds were inoculated with Common bunt and planted in a rust epiphytotic nursery. Approximately 280 early maturing plants were selected based on minimal disease, semi-dwarf stature, strong straw and kernel characteristics once individual spikes were threshed. In a contra season nursery near Temuco, Chile, 217 F3 lines were grown and 100 lines were selected based on relative maturity, plant height and straw strength. The F4 to F8 generations were advanced in various locations in Saskatchewan (near Swift Current, Indian Head and Saskatoon) and in a contra season nursery in Irwell, New Zealand. The lines were assessed for grain yield and plants were also selected based on their responses to diseases in specialized nurseries in Western Canada in the F4, F6 and F8 generations. One F9 line designated as C1203-H0*3, identified as meeting all selection criteria at each stage and was evaluated in the High Yield Wheat 'B' test in 2017 and as HY2095 in the High Yield Wheat Registration Test from 2018 to 2020. Breeder seed production commenced in 2018 near Swift Current, Saskatchewan.

Tests & Trials: The comparative trials for 'AAC Rimbey' were conducted at the Agriculture and Agri-Food Canada, Swift Current Research and Development Centre during the 2020 and 2021 growing seasons. There were 4 replicates of 4.6 square metre plots arranged in an RCB Design. Each plot consisted of 4 rows, each 4 metres long, with an inter-row spacing of 23 cm. The planting density was 220 plants per metre squared, with 3200 plants per variety grown per year. Measured characteristics were based on 20 measurements per variety per year. Mean differences were significant at the 5% confidence probability level based on LSD values. The insect reaction rating was provided through the Disease Evaluation Team of the Prairie Recommending Committee for Wheat, Rye and Triticale from the registration trials conducted from 2018 to 2020.

Comparison tables for 'AAC Rimbey' with reference varieties 'AAC Penhold', 'AAC Ryley' and 'SY985'

Flag leaf width (mm)

Plant height at maturity (stem plus spike, including awns) (cm)

Spike length (excluding awns) (cm)

Click on image for larger view

Wheat: 'AAC Rimbey' (left) with reference varieties 'AAC Penhold' (centre left), 'AAC Ryley' (centre right) and 'SY985' (right)

Click on image for larger view

Wheat: 'AAC Rimbey' (left) with reference varieties 'AAC Penhold' (centre left), 'AAC Ryley' (centre right) and 'SY985' (right)