Denomination: 'SY433'
Previously Proposed Denomination: 'BW433'
Botanical Name: Triticum aestivum
Applicant/Holder: Syngenta Canada, Inc.
105 Jefferson Street
Morden, Manitoba
R6M 0B8
Breeder: Francis Kirigwi, Syngenta Canada, Inc., Morden, Manitoba
Application Date: 2011-05-12
Application Number: 11-7291
Grant of Rights Date: 2013-11-01
Certificate Number: 4646
Grant of Rights Termination Date: 2031-11-01

Variety Description

Varieties used for comparison: 'McKenzie' and 'WR859 CL'

Summary: 'BW433' is taller in overall plant height (including spike and awns), produces heavier kernels and begins heading later than both reference varieties. The straw of 'BW433' has no anthocyanin colouration at maturity whereas that of 'McKenzie' has strong anthocyanin. The attitude of the spike awns is less spreading for 'BW433' than the reference varieties. The beak of the lower glume of 'BW433' is longer than that of 'McKenzie' and shorter than that of 'WR859 CL'. The shoulder of the lower glume is straight to elevated for 'BW433' whereas it is slightly sloping to straight for 'WR859 CL'.


PLANT: spring wheat, growth habit is intermediate between erect and prostrate, medium to high frequency of plants with recurved flag leaves, matures mid-season to late
SEEDLING (4-leaf stage): coleoptile with absent or very weak intensity of anthocyanin colouration, glabrous sheath and blade of the lower leaves

FLAG LEAF: auricles with absent or very weak intensity of anthocyanin colouration, glabrous blade, glabrous sheath, medium to strong glaucosity of sheath

CULM/NECK: absent or very weak glaucosity, mostly straight at maturity

STRAW: medium thick pith in cross section, no anthocyanin colouration at maturity

SPIKE: tapering, dense to very dense, erect attitude at maturity, absent or very weak glaucosity, white at maturity, moderate to dense hairiness of convex surface of the apical rachis segment
AWNS: long, more appressed than spreading, white
LOWER GLUME: medium to wide, medium to long, sparse to moderately dense pubescence, shape of shoulder ranges from straight to elevated, broad shoulder, slight to moderately curved beak, medium to long beak, sparse to moderately dense internal hairs
LEMMA: slight to moderately curved beak

KERNEL: hard red type, medium red, medium to large, medium to long, medium to wide, ovate to oval, rounded cheek, short to medium length brush hairs, medium size germ when observed from dorsal view, oval germ, medium width of crease, shallow to medium depth of crease

AGRONOMIC CHARACTERISTICS: good resistance to shattering, good tolerance to pre-harvest sprouting, good bread quality

DISEASE REACTIONS: resistant to Stem rust (Puccinia graminis f. sp. tritici), resistant to moderately resistant to Fusarium head blight (Fusarium graminearum) and Leaf rust (Puccinia triticina), moderately susceptible to Loose smut (Ustilago tritici), and susceptible to Common bunt (Tilletia caries, Tilletia foetida)

Origin & Breeding History: 'BW433' (experimental designation 02S2009-2) is a spring wheat variety that originated from a cross between 'BW275W' and 'N99-2587', made in Berthoud, Colorado, USA in 2000. In 2003, individual head selections were taken from an F2 population screened at the Syngenta Seeds Canada breeding nursery in Rosebank, Manitoba. Single seed descent was used to advance these selections through F3 and F4 generations in the greenhouse and in the summer of 2004, F5 head-rows were individually bulked. In 2006, these bulks in the F6 generation were screened and selected from two observation nurseries in Rosebank and Souris, Manitoba. One of the bulk selections designated '02S2009-2' was selected and tested in research plots during 2006 and 2007. In 2007, eighty heads were picked for initial purity from an F8 (F4 derived) increase plot. During the 2008 to 2010 growing seasons, 'O2S2009-2' was tested as 'BW433' in the Central Bread Wheat Cooperative trials. In 2010, breeder seed of 'BW433' was produced in Berthoud, Colorado, USA.

Tests & Trials: Tests and trials were conducted at the Viterra/Proven Seed Research Farm in Rosebank, Manitoba during the summers of 2010 and 2011. The plot size was 1.4 metres x 5.0 metres and contained 2400 plants spaced 1.5 cm per plot. There were 3 replications arranged in an RCB design.

Comparison tables for 'SY433' with reference varieties 'McKenzie' and 'WR859 CL'

Height (stem including spike and awns) (cm)

  'SY433' 'McKenzie' 'WR859 CL'
mean 2010 102.4 97.7 94.9
std. deviation 4.81 5.15 3.38
mean 2011 109.6 107.9 93.4
std. deviation 3.30 1.90 4.49

Kernel weight (grams per 1000 kernels)

  'SY433' 'McKenzie' 'WR859 CL'
2010 33.0 28.0 28.8
2011 35.1 30.1 32.2

Click on image for larger view
Wheat: 'BW433' (right) with reference varieties 'McKenzie' (left) and 'WR859 CL' (centre)

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