AAC Goldrush

Wheat

Variety Description

Varieties used for comparison: 'CDC Buteo' and 'AAC Elevate'

Summary: At booting, the frequency of plants with recurved flag leaves is high to very high for 'AAC Goldrush' whereas the frequency is absent or very low to low for 'AAC Elevate'. The anthocyanin colouration of the flag leaf auricle is weak to strong for 'AAC Goldrush' whereas it is absent or very weak for 'AAC Elevate'. At maturity, the plants of 'AAC Goldrush' head later than those of 'CDC Buteo'. The plants of 'AAC Goldrush' are shorter than the plants of 'CDC Buteo' and taller than those of 'AAC Elevate'. The culm glaucosity is medium for 'AAC Goldrush' whereas it is weak for 'CDC Buteo'. The spike of 'AAC Goldrush' is shorter than the spike of 'AAC Elevate'. The lower glume shoulder shape is sloping to slightly sloping for 'AAC Goldrush' whereas it is straight for 'CDC Buteo'. The lower glume beak is short to medium in length for 'AAC Goldrush' whereas it is medium to long for 'AAC Elevate'.

Description:

PLANT: winter type, hard red, common wheat, intermediate growth habit at the 5 to 9 tiller stage, high to very high frequency of plants with recurved flag leaves, matures mid-season

SEEDLING (4-leaf stage): very weak intensity of anthocyanin colouration of the coleoptile, glabrous sheath and blade of the lower leaves

FLAG LEAF: weak to strong intensity of anthocyanin colouration of the auricles, medium to strong glaucosity of the sheath, glabrous blade and sheath

CULM: medium glaucosity, straight neck
STRAW: very thin pith in cross-section, no anthocyanin colouration at maturity

SPIKE: medium glaucosity, tapering, medium density, white to yellow at maturity, inclined to nodding attitude
AWNS: equal to length of spike, white to light yellow at maturity
LOWER GLUME SHOULDER: narrow, sloping to slightly sloping
LOWER GLUME: medium to long, narrow to medium width, glabrous
LOWER GLUME BEAK: short to medium length, slightly curved shape

KERNEL: medium red, medium sized

AGRONOMIC CHARACTERISTICS: good resistance to lodging, good to very good winter hardiness

BREAD QUALITY: fair to good

DISEASE REACTIONS: resistant to moderately resistant to Leaf rust (Puccinia recondita); moderately resistant to Stem rust (Puccinia graminis f. sp. tritici); and moderately resistant to moderately susceptible to Stripe rust (Puccinia striiformis) and Fusarium head blight (Fusarium species and specifically Fusarium graminearum); and highly susceptible to Common bunt (Tilletia caries, Tilletia foetida)

Origin & Breeding History: 'AAC Goldrush' (experimental designations LL430 and W526) was selected from the cross 'S98-11' // 'Crimson'/'CDC Falcon' conducted in 2004 at the Agriculture and Agri-Food Canada Lethbridge Research and Development Centre, Lethbridge, Alberta. In 2005, the F1 seed was increased in the greenhouse. In 2006, F2 bulk plots were grown in Lethbridge and 97 heads selected based on winter survival, plant type, height and straw strength and planted as rows. In 2007, 87 spikes were selected from desirable F3 rows based on similar charcteristics and planted as head rows in an inoculated leaf and stem rust nursery at the University of Manitoba, Winnipeg, Manitoba. In 2008, 92 spikes were selected based on rust resistance and planted as F5 observation rows in Lethbridge. In 2009, 38 rows were harvested and seeded in single replicate plots in Lethbridge, as well as disease and cold tolerance assessment nurseries in Manitoba and Saskatchewan respectively. Replicated, multi-location agronomic trials across Western Canada were conducted in 2011 and 2012, and reactions to stem, leaf and stripe rust, Fusarium head blight and common bunt were assessed in inoculated nurseries. End-use quality was assessed from 2010-2012. LL430 entered the Western Winter Wheat Cooperative Registration as W526 and was evaluated for registration from 2012/13 to 2014/15.

Tests & Trials: The comparative trials were conducted during the 2016 and 2018 growing seasons at the Agriculture and Agri-Food Canada Lethbridge Research and Development Centre, Lethbridge, Alberta. Plots consisted of 4 rows, with a row length of 3.5 metres and a row spacing of 23 cm. There were 4 replications arranged in an RCB design. Measured characteristics were based on a minimum of 12 measurements per variety per year. Mean differences are significant at the 5% probability level based on a 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 2013 to 2015.

Comparison tables for 'AAC Goldrush' with reference varieties 'CDC Buteo' and 'AAC Elevate'

Days to heading (days from planting to when 50% heads are fully emerged from boot)

Plant height (at maturity) (including awns) (cm)

Spike length (excluding awns) (cm)

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Wheat: 'AAC Goldrush' (centre) with reference varieties 'CDC Buteo' (left) and 'AAC Elevate' (right)

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Wheat: 'AAC Goldrush' (top) with reference varieties 'AAC Elevate' (centre) and 'CDC Buteo' (bottom)