AAC Gateway


Denomination: 'AAC Gateway'
Botanical Name: Triticum aestivum
Applicant/Holder: Agriculture & Agri-Food Canada, Lethbridge
Lethbridge Research Centre, 5403 - 1 Avenue, South
P.O. Box 3000
Lethbridge, Alberta
T1J 4B1
Breeder: Robert Graf, Agriculture & Agri-Food Canada, Lethbridge, Alberta
Agent in Canada: Agriculture & Agri-Food Canada
Office of Intellectual Property and Commercialization
6000 C&E Trail
Lacombe, Alberta
T4L 1W1
Tel: (403) 782-8126
Application Date: 2012-10-23
Application Number: 12-7771
Grant of Rights Date: 2014-11-19
Certificate Number: 4950
Grant of Rights Termination Date: 2032-11-19

Variety Description

Varieties used for comparison: 'CDC Falcon', 'CDC Raptor' and 'CDC Osprey'

Summary: 'AAC Gateway' has shorter flag leaves than 'CDC Raptor' and 'CDC Osprey'. The frequency of plants with recurved flag leaves on 'AAC Gateway' is low to medium whereas the frequency is medium to high in 'CDC Raptor' and high to very high in 'CDC Osprey'. At booting, the glaucosity of the flag leaves of 'AAC Gateway' is strong to very strong whereas it is medium on the reference varieties. The plants of 'AAC Gateway' are shorter than those of 'CDC Raptor' and 'CDC Osprey'. The culm of 'AAC Gateway' has medium glaucosity whereas it is weak on 'CDC Falcon' and 'CDC Osprey' and absent on 'CDC Raptor'. The spike attitude of 'AAC Gateway' is erect to inclined whereas it is nodding on 'CDC Osprey'. The spike of 'AAC Gateway' is shorter than that of 'CDC Raptor'. The lower glume shoulder shape of 'AAC Gateway' is strongly elevated with a second point present whereas it is sloping to slightly sloping on 'CDC Raptor' and 'CDC Osprey'.


PLANT: winter type, semi-erect to intermediate growth habit at the 5 to 9 tiller stage, heads emerge early to mid-season, matures mid-season

SEEDLING: absent or very weak intensity of anthocyanin colouration of coleoptile, glabrous lower leaf sheaths, glabrous to slightly pubescent leaf blades

FLAG LEAF: low to medium frequency of plants with recurved/drooping flag leaves, absent or very weak anthocyanin colouration of auricles, medium to strong glaucosity of sheath, glabrous blade and sheath

CULM NECK: medium glaucosity, very slight curvature
STRAW: hollow in cross section, yellow with no anthocyanin colouration at maturity
SPIKE: weak glaucosity, tapering shape, lax to medium density, yellow at maturity, erect to inclined attitude at maturity, absent or very sparse hairiness of convex surface of apical rachis segment
AWNS: shorter than length of spike, light brown
LOWER GLUME: medium to long, medium width, glabrous to very slightly pubescent, sparse extent of internal hairs
LOWER GLUME SHOULDER: medium width, strongly elevated with second point present
LOWER GLUME BEAK: medium to long, acuminate

KERNEL: hard red type, medium red colour, brown to black reaction to phenol

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

QUALITY CHARACTERISTICS: good bread making quality

DISEASE REACTION: resistant to moderately resistant to Stem Rust (Puccinia graminis f. sp. tritici) and Stripe Rust (Puccinia striiformis); moderately resistant to Leaf Rust (Puccinia triticina); moderately resistant to moderately susceptible to Fusarium Head Blight (Fusarium graminearum, Fusarium species); moderately susceptible to Powdery Mildew (Erysiphe graminis f. sp. tritici) and highly susceptible to Common Bunt (Tilletia caries, Tilletia foetida)

Origin & Breeding History: 'AAC Gateway' (experimental designation W478) is derived from the cross 'CDC Osprey' / 'N95L1226' made in 2000 at the Agriculture and Agri-Food Canada Lethbridge Research Centre, Lethbridge, Alberta. The F1 hybrids were grown in the greenhouse with the resulting seed planted in a thinly planted F2 bulk plot grown in the field in Lethbridge in 2002 from which heads were collected and planted as F3 head rows. In 2003, selections were made based on winter survival, plant type and vigour, plant height, straw strength, protein concentration and test weight. Selections were artificially inoculated and evaluated for Stem and Leaf Rust resistance in 2004. Based on rust resistance, the resulting selections were grown in an F5 in Lethbridge of which one was designated LG813. This one line was tested in an irrigated, single replicate preliminary agronomic trial in Lethbridge and in the inoculated Stem and Leaf Rust nursery in Winnipeg, Manitoba in 2006. It was tested again at multiple locations in 2007 and 2008. From 2009 to 2011, it was tested as W478 in the Western Winter Wheat Cooperative Registration trials at various locations throughout Alberta, Manitoba and Saskatchewan.

Tests & Trials: Tests and trials were conducted in 2012 and 2013 in Lethbridge, Alberta. Plots consisted of 4 rows per plot with a row length of 3.5 meters and a row spacing of 23 cm. There were 4 replicates arranged in a RCB design. Measured characteristics were based on a minimum of 21 measurements per year.

Comparison tables for 'AAC Gateway' with reference varieties 'CDC Falcon', 'CDC Raptor' and 'CDC Osprey'

Flag leaf length (cm)

  'AAC Gateway' 'CDC Falcon' 'CDC Raptor' 'CDC Osprey'
mean 2012 16.7 17.1 18.5 19.6
std. deviation 2012 2.2 1.8 2.7 3.1
mean 2013 19.9 20.5 21.8 23.7
std. deviation 2013 2.4 3.1 3.0 3.1

Plant height at maturity (cm)

  'AAC Gateway' 'CDC Falcon' 'CDC Raptor' 'CDC Osprey'
mean 79 77 88 97

Spike length (mm)

  'AAC Gateway' 'CDC Falcon' 'CDC Raptor' 'CDC Osprey'
mean 2012 89.9 91.4 95.3 93.7
std. deviation 2012 3.6 3.9 6.1 6.7
mean 2013 86.4 93.8 97.6 98.4
std. deviation 2013 6.7 6.4 6.5 7.8

Click on image for larger view
AAC Gateway
Wheat: 'AAC Gateway' (centre right) with reference varieties 'CDC Falcon' (left), 'CDC Osprey' (centre left) and 'CDC Raptor' (centre)

Click on image for larger view
AAC Gateway
Wheat: 'AAC Gateway' (bottom right) with reference varieties 'CDC Osprey' (top left), 'CDC Falcon' (top centre) and 'CDC Raptor' (top right)

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