CDC Landmark

Wheat

Denomination: 'CDC Landmark'
Previously Proposed Denomination: 'BW971'
Botanical Name: Triticum aestivum
Applicant/Holder: University of Saskatchewan
Crop Development Centre
4D36 Agriculture Building, 51 Campus Drive
Saskatoon, Saskatchewan
S7N 5A8
Canada
Breeder: Pierre Hucl, University of Saskatchewan, Saskatoon, Saskatchewan
Application Date: 2015-10-19
Application Number: 15-8733

Variety Description

Varieties used for comparison: 'Unity', 'Cardale' and 'Carberry'

Summary: The plants of 'CDC Landmark' are shorter than those of 'Unity'. The spike of 'CDC Landmark' is shorter than that of 'Cardale' and 'Carberry'. In cross section, the pith of the straw of 'CDC Landmark' is of medium thickness whereas it is very thin for 'Cardale' and 'Carberry'. The hairiness of the convex surface of the apical rachis segment of 'CDC Landmark' is very sparse whereas it is medium to dense for 'Unity' and sparse to medium density for 'Carberry'. 'CDC Landmark' carries the gene for resistance to Orange blossom wheat midge (Sitodiplosis mosellana) whereas 'Cardale' and 'Carberry' do not.

Description:

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

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

FLAG LEAF: low to medium frequency of plants with recurved/drooping flag leaves, very weak intensity of anthocyanin colouration of auricles, medium glaucosity of sheath, glaucosity absent on lower side of leaf blade, glabrous blade and sheath

CULM NECK: medium glaucosity, weak degree of curvature, upper internode glabrous
STRAW: medium to thick pith in cross-section, no anthocyanin colouration at maturity, yellow
SPIKE: very weak glaucosity, tapering shape in profile, medium density, white at maturity, inclined attitude, very sparse hairiness of convex surface of apical rachis segment
AWNS: shorter than length of spike, white
LOWER GLUME: medium length and width, glabrous to very slightly pubescent, medium extent of internal hairs
LOWER GLUME SHOULDER: narrow to medium width, straight to elevated shape
LOWER GLUME BEAK: medium to long, slightly curved
LOWEST LEMMA: straight to slightly curved beak shape

KERNEL: light red, medium size, medium length and width, oval shape, rounded cheek, medium length brush hairs, mid-wide and mid-deep crease
GERM: medium size, oval shape

DISEASE REACTION: resistant to Stem Rust (Puccinia graminis f. sp. tritici); moderately resistant to Loose Smut (Ustilago tritici) and Stripe Rust (Puccinia striiformis); moderately resistant to moderately susceptible to Fusarium Head Blight (Fusarium graminearum, Fusarium species) and Leaf Spots (a combination of Pyrenophora tritici-repentis, Septoria nodorum, S. tritici and S. avena f. sp. triticea); moderately susceptible to Common Bunt (Tilletia tritici and Tilletia laevis) and Leaf Rust (Puccinia triticina)

Origin & Breeding History: 'CDC Landmark' (experimental designation 'BW971') is derived from the cross 'Unity' / 'BW864' carried out in the winter of 2006 at the Crop Development Centre of the University of Saskatchewan. The F1 was grown in the field at Saskatoon and the F2 was bulked in a winter nursery in New Zealand during the winter of 2006-2007 with the F3 bulked in a nursery in Saskatoon. F4 and F5 advances were grown as single seed descent in the greenhouse in Saskatoon during the winter of 2007-2008. F6 hills were grown in Saskatoon and selected for reaction to rust, plant type and straw strength during the following growing season. During the 2009 growing season, seed from a bulked F6 hill was entered into an unreplicated yield trial nursery in Saskatoon and subjected to selection for improved yield, height and straw strength. 'BW971' was evaluated as W10091 in preliminary yield trials in 2010, in the Western Bread Wheat 'B' Test in 2011 and subsequently evaluated in the Parkland Wheat Cooperative Test from 2012 to 2014.

Tests & Trials: The comparative tests and trials of 'CDC Landmark' were conducted during the 2015 and 2016 growing seasons at the Crop Science Research Farm, University of Saskatchewan, Saskatoon, Saskatchewan. A four replicate, randomised complete block design was planted with each replicate consisting of 5 rows. The plot size was 3.6 metres by 1.2 metres with a seeding rate of 1400 seeds per plot. Mean differences are significant at the 5% probability level based on a paired student's T-test.


Comparison tables for 'CDC Landmark' with reference varieties 'Unity', 'Cardale' and 'Carberry'

Plant height (including awns) (cm)

  'CDC Landmark' 'Unity' 'Cardale' 'Carberry'
mean 2015 74.3 86.7 75.5 74.0
std. deviation 2015 2.1 3.5 3.2 1.9
mean 2016 79.7 86.5 80.0 80.9
std. deviation 2016 2.9 2.4 2.2 2.4

Spike length (excluding awns) (cm)

  'CDC Landmark' 'Unity' 'Cardale' 'Carberry'
mean 2015 6.5 6.7 7.0 7.0
std. deviation 2015 0.5 0.5 0.5 0.5
mean 2016 6.8 7.4 7.7 8.0
std. deviation 2016 0.5 0.6 0.4 0.7

Click on image for larger view
CDC Landmark
Wheat: 'CDC Landmark' (left) with reference varieties 'Unity' (centre left), 'Cardale' (centre right) and 'Carberry' (right)

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