Topaz

Flax

Denomination: 'Topaz'
Previously Proposed Denomination: 'WestLin 74'
Botanical Name: Linum usitatissimum
Applicant/Holder: Crop Production Services (Canada) Inc.
538058 – 56 St. E
P.O. Box 5234
High River, Alberta
T1V 1M4
Canada
Breeder: Michelle Beaith, Crop Production Services (Canada) Inc., Saskatoon, Saskatchewan
Agent in Canada: Alliance Seed Corporation
22nd Floor, 333 Main Street, MTS Place
Winnipeg, Manitoba
R3C-4E2
Canada
Application Date: 2015-05-27
Application Number: 15-8650

Variety Description

Varieties used for comparison: 'CDC Bethune', 'Flanders' and 'Prairie Thunder'

Summary: At the bud stage, 'Topaz' has very weak to weak sepal dotting whereas 'Flanders' has weak to medium sepal dotting and 'Prairie Thunder' has medium sepal dotting. The plants of 'Topaz' flower later than all the reference varieties. The distal end of the filament of 'Topaz' is blue whereas that of 'Prairie Thunder' is white. The boll of 'Topaz' is shorter than that of 'CDC Bethune' and 'Prairie Thunder'. The boll of 'Topaz' is wider than that of 'Flanders' and narrower than that of 'Prairie Thunder'. The stem from the cotyledon scar to the first branch and to the top boll is longer for 'Topaz' than for 'Prairie Thunder'.

Description:

FLOWER: very weak to weak sepal dotting at bud stage, violet crown just before opening, flattened disk shape, medium size corolla, violet when fully developed, overlapping petal arrangement
STAMEN: blue at distal end of filament, white at basal end of filament, dark blue anther
PISTIL: dark blue at basal end of style

BOLL: medium size, no ciliation of false septa, semi-dehiscent, matures mid-season
SEED: oilseed type, light brown to light red brown, medium to large

AGRONOMY: good resistance to lodging

Origin & Breeding History: 'Topaz' (experimental designations 08-88-F7-109, FP2457) originated from the cross between 'VT 50' and 'CN 96849' conducted in 2008 in Vegreville, Alberta. The line was advanced using the pedigree method with single plant selections from nursery rows in Vegreville from the F2 and F3 generations. Early selections were based on performance compared to the parents, lodging resistance, oil quality, early maturity, stem drydown, determinancy and disease resistance. The F5 generation was grown in full size plots at a single location and selected for early maturity, oil content, seed size, fatty acid content, seedling vigour, stem drydown, determinancy, lodging and disease resistance. In 2012, a single plant selection, designated 08-88-F6-109, was evaluated in advanced replicated yield trials at seven locations across Manitoba, Saskatchewan, Alberta and British Columbia. In 2013 and 2014, 08-88-F7-109 was entered into the Flax Cooperative test as FP2457.

Tests & Trials: The comparative trials of 'Topaz' were conducted during the summers of 2014 and 2015 in Rosthern, Saskatchewan and consisted of 4 replications of each variety distributed in a RCB design. There were 6 rows per plot with a row length of 5 metres and a row spacing of 25 centimetres. Plots were seeded at a rate of 800 plants per square metre. Measured characteristics were based on 60 bolls, 60 stems and 12 seed weights per 1000 seeds per variety each year. Mean differences were significant at the 5% probability level based on a paired Student's t-test.


Comparison tables for 'Topaz' with reference varieties 'CDC Bethune', 'Flanders' and 'Prairie Thunder'

Days to flowering

  'Topaz' 'CDC Bethune' 'Flanders' 'Prairie Thunder'
2014 mean 58 56 56 55
2015 mean 56 54 53 52

Boll length (mm)

  'Topaz' 'CDC Bethune' 'Flanders' 'Prairie Thunder'
2014 mean 7.2 7.7 6.9 7.7
2014 std. deviation 0.55 0.55 0.41 0.48
2015 mean 6.6 7.3 6.8 6.8
std. deviation 0.53 0.77 0.52 0.51

Boll width (mm)

  'Topaz' 'CDC Bethune' 'Flanders' 'Prairie Thunder'
2014 mean 7.1 7.2 6.9 7.3
2014 std. deviation 0.50 0.48 0.39 0.50
2015 mean 6.9 6.7 6.5 7.1
2015 std. deviation 0.30 0.66 0.58 0.41

Stem length from cotyledon scar to first branch when fully developed (cm)

  'Topaz' 'CDC Bethune' 'Flanders' 'Prairie Thunder'
2014 mean 42.0 42.4 41.1 38.6
2014 std. deviation 3.98 4.56 4.54 5.44
2015 mean 36.2 31.6 30.9 26.2
2015 std. deviation 6.23 4.43 3.77 3.62

Stem length from cotyledon scar to top boll when fully developed (cm)

  'Topaz' 'CDC Bethune' 'Flanders' 'Prairie Thunder'
2014 mean 58.6 59.2 57.8 53.5
2014 std. deviation 4.43 4.42 4.09 3.22
2015 mean 55.9 48.9 48.6 45.0
2015 std. deviation 3.20 3.79 3.10 3.18

Click on image for larger view
Topaz
Flax: 'Topaz' (centre) with reference variety 'CDC Bethune' (left)

Click on image for larger view
Topaz
Flax: 'Topaz' (centre) with reference variety 'Prairie Thunder' (right)

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