6PSQD81B

Wheat

Variety Description

Varieties used for comparison: '25R46' and '6PZNF07B'

Summary: At booting, '6PSQD81B' has a low to medium frequency of plants with recurved flag leaves while '25R46' has a very high frequency of plants with recurved flag leaves. The flag leaf of '6PSQD81B' is longer and narrower than the flag leaf of '6PZNF07B' and wider than that of '25R46'. The flag leaf sheath of '6PSQD81B' has an absent or very weak degree of glaucosity while the flag leaf sheath of '25R46' has a weak degree of glaucosity. At heading, the spike of '6PSQD81B' has a weak degree of glaucosity while the spike of '25R46' has a medium to strong degree of glaucosity and that of '6PZNF07B' has an absent or very weak degree of glaucosity. At maturity, the plants of '6PSQD81B' are shorter than those of '25R46' and '6PZNF07B'. The spike of '6PSQD81B' is fusiform in profile whereas the spike of '6PZNF07B' is parallel sided in profile. The spike of '6PSQD81B' has an inclined attitude while that of '6PZNF07B' has a nodding attitude. The culm neck of '6PSQD81B' is curved while those of the reference varieties are straight.

Description:

PLANT: common wheat, winter type, semi-erect growth habit at 5 to 9 tiller stage, low to medium frequency of plants with recurved flag leaves, heads emerge late in the season

SEEDLING (4 LEAF STAGE): glabrous sheath and blade of lower leaves

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

CULM NECK: strong degree of glaucosity at heading, curved
STRAW (AT MATURITY): thin pith in cross-section

SPIKE: weak glaucosity at heading, fusiform shape in profile, medium density, white at maturity, inclined attitude
AWNS: longer than spike, brown at maturity
LOWER GLUME: medium length and width, glabrous, sparse internal hair
LOWER GLUME SHOULDER: narrow, slightly sloping
LOWER GLUME BEAK: short, straight
LOWEST LEMMA: straight beak

KERNEL: soft white type, white, large, medium length and width, broad elliptical, rounded cheek, medium length brush hairs, crease of medium width and depth
GERM: small, oval

Origin & Breeding History: '6PSQD81B' (experimental designation 25W37) was developed using the pedigree method of plant breeding. The variety resulted from a three way cross between 25R30, 112304W and a proprietary line, conducted at Pioneer Hi-Bred International, Inc. in Windfall, Indiana, USA in 2008. The variety was advanced in Windfall, Indiana based on grain yield, test weight, maturity, disease resistance, plant type, plant height, head type, straw strength as well as milling and baking characteristics. One F7 line was designated 25W37 in 2015. Breeder seed was established at the F9 generation in 2017.

Tests & Trials: The comparative trial for '6PSQD81B' was conducted at Pioneer Hi-Bred Production Limited in Caledon, Ontario during the 2021 growing season. There were 3 replicates arranged in an RCB design. Each plot consisted of 6 rows, each row measuring 3.2 metres long, with an inter-row spacing of 30 cm. The planting density resulted in a total of 7800 plants per variety. Measured characteristics were based on 24 measurements per variety. Mean differences were significant at the 5% confidence probability level based on a paired Student's t-test. Results were supported by the official technical examination report 202100024, purchased from the Plant Variety Protection Office in Washington, District of Columbia, USA.

Comparison tables for '6PSQD81B' with reference varieties '25R46' and '6PZNF07B'

Flag leaf length (cm)

Flag leaf width (mm)

Plant height at maturity (stem plus spike, including awns) (cm)

Click on image for larger view

Wheat: '6PSQD81B' (left) with reference varieties '25R46' (centre) and '6PZNF07B' (right)