AAC Iceberg

Wheat

Denomination: 'AAC Iceberg'
Previously Proposed Denomination: 'HW021'
Botanical Name: Triticum aestivum
Applicant/Holder: Agriculture & Agri-Food Canada, Winnipeg
Cereal Research Centre
195 Dafoe Road
Winnipeg, Manitoba
R3T 2M9
Canada
Breeder: Gavin Humphreys, Agriculture & Agri-Food Canada, Winnipeg, Manitoba
Agent in Canada: Agriculture & Agri-Food Canada
Office of Intellectual Property and Commercialization
6000 C&E Trail
Lacombe, Alberta
T4L 1W1
Canada
Tel: (403) 782-8126
Application Date: 2012-04-30
Application Number: 12-7604
Grant of Rights Date: 2015-05-14
Certificate Number: 5022
Grant of Rights Termination Date: 2035-05-14

Variety Description

Varieties used for comparison: 'AC Vista', 'Whitehawk' and 'Snowstar'

Summary: At maturity, the plants of 'AAC Iceberg' are taller than those of 'Snowstar'. The spike of 'AAC Iceberg' is shorter than that of 'AC Vista'. The spikes of 'AAC Iceberg' have awns whereas those of 'Whitehawk' and 'Snowstar' have awnlets. The awns at the tip of the spike of 'AAC Iceberg' are shorter than the length of the spike whereas the awns are equal to the length of the spike on 'AC Vista'. The kernel size of 'AAC Iceberg' is smaller than that of 'AC Vista' and larger than that of 'Whitehawk' and 'Snowstar'.

Description:

PLANT: hard white spring type, semi-erect growth habit at the 5 to 9 tiller stage, heads emerge mid-season

SEEDLING: weak to medium intensity of anthocyanin colouration of coleoptile, glabrous lower leaf sheaths and blades

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

CULM NECK: medium glaucosity, straight
STRAW: thin pith in cross section, no anthocyanin colouration at maturity
SPIKE: weak glaucosity, tapering shape in profile, lax to medium density, white at maturity, incline attitude, medium to dense hairiness of convex surface of apical rachis segment
AWNS: shorter than length of spike, white, slightly spreading
LOWER GLUME: medium length and width, glabrous, dense internal hair
LOWER GLUME SHOULDER: medium to broad, straight shape
LOWER GLUME BEAK: short to medium length, straight to slightly curved
LOWEST LEMMA: slightly curved beak shape

KERNEL: white, small to medium size, short to medium length, medium width, broad elliptical shape, angular cheek, long brush hairs, narrow width and shallow to medium depth of crease
GERM: medium size, broad elliptical in shape

Origin & Breeding History: 'AAC Iceberg' (experimental designations 00V22-BC1C and HW021) was derived from a backcross of 'Argent' with BW275 conducted in 2000 at the Cereal Research Centre, Agriculture and Agri-Food Canada, Winnipeg, Manitoba. The F1 plants were grown in the greenhouse in 2001. In 2002, F2 seed was grown in thinly seeded plots at Glenlea, Manitoba where spikes were collected from short, disease-free plants, screened for sprouting response and the most dormant spikes were selected for further increase as F3 lines at Indian Head, Saskatchewan. In 2003, F4 head rows were grown and evaluated in Glenlea, Manitoba for leaf and stem rust, plant height, maturity and straw strength. The F5 through F8 generations were increased in Winter Nurseries in Palmerston North, New Zealand or evaluated in yield tests in western Canada with the most desirable lines being advanced to A-level testing. In 2006, 00V22-BC1C was evaluated in the Cereal Research Centre Hard White "A1" at five sites across Manitoba and Saskatchewan and was further evaluated in the Cereal Research Centre Hard White "B" test at six locations across western Canada in 2007. In 2008, this line was designated HW021 and tested in the Hard White Wheat Cooperative Test in 2008, 2009 and 2011.

Tests & Trials: Tests and trials for 'AAC Iceberg' were conducted at Agriculture and Agri-Food Canada's plots located at the Manitoba Crop Development Centre in Portage la Prairie, Manitoba, during the summers of 2012 and 2013. The size of the plots was 3.72 square metres and consisted of 5 experimental rows with 2 winter wheat guard/border rows. Each row was 4.9 metres long and the rows were spaced 0.15 metres apart. The varieties were planted in 4 replications. Mean differences are significant at the 5% probability level based on a paired student's t-test.


Comparison tables for 'AAC Iceberg' with reference varieties 'AC Vista', 'Whitehawk' and 'Snowstar'

Plant height at maturity (cm)

  'AAC Iceberg' 'AC Vista' 'Whitehawk' 'Snowstar'
mean 2012 90.3 87.8 84.3 86.3
std. deviation 2012 3.5 5.4 5.1 4.1
mean 2013 93.5 90.1 96.3 89.1
std. deviation 2013 2.5 3.5 3.9 3.3

Spike length (cm)

  'AAC Iceberg' 'AC Vista' 'Whitehawk' 'Snowstar'
mean 2012 7.5 8.6 7.8 7.4
std. deviation 2012 0.4 0.6 0.4 0.2
mean 2013 8.0 8.9 7.6 7.2
std. deviation 2013 0.2 0.4 0.6 0.3

Kernel weight (grams per 1000 kernels)

  'AAC Iceberg' 'AC Vista' 'Whitehawk' 'Snowstar'
mean 2012 34.2 36.8 30.3 30.0
std. deviation 2012 1.2 1.3 0.5 1.9
mean 2013 36.4 43.5 32.6 30.4
std. deviation 2013 0.5 1.0 0.3 0.9

Click on image for larger view
AAC Iceberg
Wheat: 'AAC Iceberg' (left) with reference varieties 'AC Vista' (centre left), 'Whitehawk' (centre right) and 'Snowstar' (right)

Click on image for larger view
AAC Iceberg
Wheat: 'AAC Iceberg' (top left) with reference varieties 'AC Vista' (top right), 'Whitehawk' (bottom left) and 'Snowstar' (bottom right)

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