AAC Rivers

Wheat

Variety Description

Varieties used for comparison: 'AAC Wheatland', 'AAC Hockley' and 'AAC Ahead'

Summary: At maturity, the plants, including the awns, of ‘AAC Rivers' are taller than the plants of 'AAC Wheatland' and ‘AAC Hockley'. The one thousand seed weight for ‘AAC Rivers' is greater than that of ‘AAC Ahead'. The plants of 'AAC Rivers' are resistant to Leaf rust (Puccinia triticina) while the plants of ‘AAC Ahead' are moderately susceptible to moderately resistant.

Description:

PLANT: common wheat, spring type, intermediate to semi-prostrate growth habit at the 5 to 9 tiller stage, heads emerge mid-season

SEEDLING (4 LEAF STAGE): weak intensity of anthocyanin colouration of coleoptile, glabrous sheath and blade of lower leaves

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

CULM: absent or very sparse hairiness of upper node at heading, ranging between medium to strong and strong glaucosity, straight neck
STRAW (AT MATURITY): thin pith in cross-section

SPIKE: ranging between medium to strong and strong glaucosity at heading, tapering shape in profile, medium to dense, brownish yellow at maturity, erect attitude
AWNS: shorter than length of spike
LOWER GLUME: medium length, medium to wide, glabrous, very sparse to sparse extent of internal hairs
LOWER GLUME BEAK: ranging between short to medium and medium to long

KERNEL: medium to dark red, ranging between small to medium and medium to large, ranging between short to medium and medium to long, medium width, oval shape, rounded cheek, short to medium length brush hairs, ranging between narrow to medium and medium width crease, ranging between shallow to medium and medium to deep crease
GERM: ranging between medium and medium to large, round to oval in shape

RESISTANCE TO PRE-HARVEST SPROUTING: fair to good

DISEASE REACTIONS: resistant to Leaf rust (Puccinia triticina) and; moderately susceptible to moderately resistant to Fusarium head blight (Fusarium graminearum, Fusarium species)

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

Origin & Breeding History: 'AAC Rivers' (experimental designations BW1143 and 16SB137*E0696) originated from the cross between the breeding line BW1052 and the variety 'AAC Wheatland' conducted in 2016 at the Agriculture and Agri-Food Canada Brandon Research and Development Centre in Brandon, Manitoba. Double haploid lines were created during the winter of 2017 and 2018 with one line designated as 16SB137*E0696. This line was advanced for 4 generations based on plant height, lodging resistance, maturity, yield, test weight, kernel weight, disease and insect resistances, quality including protein content, milled grain and flour dough attributes. The variety was entered in the Central Bread Wheat Registration trials as BW1143 from 2022 to 2024. Breeder seed was established from 229 breeder seed rows in 2024.

Tests & Trials: The comparative trials for 'AAC Rivers' were conducted at the Agriculture and Agri-Food Canada, Saskatoon Research and Development Centre in Saskatoon, Saskatchewan during the 2024 and 2025 growing seasons. There were 3 replicates arranged in an RCB design. Each plot consisted of 5 rows, each row measuring 3.35 metres long, with an inter-row spacing of 17.8 cm. The planting density resulted in approximately 3000 plants per variety per year. Measured characteristics were based on 21 measurements per variety per year except for seed weight which was based on 4 measurements per variety per year. Mean differences were significant at the 5% confidence probability level based on a paired Student's t-test. Disease reaction ratings were provided through the Disease Evaluation Team of the Prairie Recommending Committee for Wheat, Rye and Triticale from the registration trials conducted from 2022 to 2024.

Comparison tables for 'AAC Rivers' with reference varieties 'AAC Wheatland', 'AAC Hockley' and 'AAC Ahead'

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

Seed weight (grams per 1000 kernels) (g)

Click on image for larger view

Wheat: ‘AAC Rivers' (center) with reference varieties ‘AAC Hockley' (left) and ‘AAC Wheatland' (right)