Denomination: '25W36'
Botanical Name: Triticum aestivum
Applicant/Holder: Pioneer Hi-Bred International, Inc.
8305 NW 62nd Avenue
P.O. Box 7060
Johnston, Iowa
United States of America
Breeder: Greg Marshall, Pioneer Hi-Bred International, Inc., Windfall, United States of America
Agent in Canada: Pioneer Hi-Bred Limited
12111 Mississauga Road
Caledon, Ontario
L7C 1X1
Tel: 905-843-9166
Application Date: 2008-05-21
Application Number: 08-6343
Grant of Rights Date: 2009-08-10
Certificate Number: 3553
Date rights surrendered: 2016-08-10

Variety Description

Varieties used for comparison: '2737W' and 'Caledonia'

Summary: '25W36' has a shorter narrower flag leaf than '2737W' and 'Caledonia'. The flag leaf auricle of '25W36' has stronger anthocyanin colouration than '2737W' and 'Caledonia'. '25W36' has weaker glaucosity of the culm than the reference varieties. The spike of '25W36' is less dense than '2737W' and has a greater nodding attitude at maturity than both reference varieties. '25W36' has a weaker glaucosity of the spike than '2737W'. The hairiness of the convex surface of the apical rachis segment of '25W36' is denser than the reference varieties. '25W36' has a shorter lower glume length than '2737W'. The shape of the shoulder of the lower glume of '25W36' is slightly sloping while it is sloping in '2737W' and straight in 'Caledonia'. '25W36' has a narrower shoulder of the lower glume than 'Caledonia'. The extent of the internal hairs of the lower glume of '25W36' is denser than in 'Caledonia'. '25W36' has a straight beak shape of the lemma while it is slightly curved in '2737W' and moderately curved in 'Caledonia'. The kernel embryo of '25W36' is round while it is oval in '2737W'.


PLANT: winter type, semi-erect growth habit
SEEDLING: absent to very weak anthocyanin colouration of the coleoptile

FLAG LEAF: high frequency of plants with recurved/drooping flag leaves, absent to very weak pubescence on the blades and sheaths, weak intensity of anthocyanin colouration of auricles, medium glaucosity of sheath

CULM NECK: weak glaucosity, straight
STRAW: thin pith in cross section, no anthocyanin colouration at maturity

SPIKE: tapering shape, medium density, nodding attitude at maturity, medium glaucosity, white at maturity, very short awnlets present, medium hairiness of the convex surface of the apical rachis segment
LOWER GLUME: medium width, medium length, absent or very weak pubescence, slightly sloping medium width shoulder, moderately curved short beak, medium extent of internal hairs
LEMMA: straight beak

KERNEL: soft white type, white colour, medium size kernel, midlong, midwide, oval shape, rounded cheek shape, midlong brush hairs, midsize germ, round shape of germ, narrow shallow crease, dark colouration reaction to phenol

AGRONOMIC CHARACTERISTICS: good winter survival, poor pre-harvest sprouting

QUALITY CHARACTERISTICS: fair pastry and biscuit quality

DISEASE RESISTANCE: moderately susceptible to susceptible to Fusarium head blight (Fusarium graminearum, Fusarium species) and Wheat soil borne Mosaic virus, moderately resistant to Leaf rust (Puccinia triticina) Powdery mildew (Erysiphe graminis, f. sp. tritici) and Spindle streak Mosaic virus, resistant to Stripe rust (Puccinia striiformis), moderately resistant to moderately susceptible to Septoria tritici blotch (Septoria tritici)

Origin & Breeding History: '25W36' (experimental designations W960964N1, XW05K) derives from the three-parent cross, WBJ0325D1*25W33/ WBL0305A1 made in 1995 at the Pioneer Hi-Bred station in Windfall, Indiana. WBJ0325D1 = 2737W sib./ NY6708-18 (PI 499283)// 2548 and WBL0305A1 = 2510 sib./ 3/ Aurora/ Tyler// 2553/ 2550 sib./ 4/ 2737W. The detailed pedigree is 2737W sib./ NY6708-18 (PI 499283)// 2548/ 3/ 25W33/ 5/ 2510 sib./ 3/ Aurora/ Tyler// 2553/2550 sib./ 4/ 2737W. In 1996, the F1 generation was grown in a transplant nursery at Windfall, Indiana. In 1996-1997, the F2 bulk populations were grown in Windfall and Ft. Branch, Indiana where individual spike selections were made at both locations. Headrows from the F2 selections were grown in 1997-1998 in Windfall and Ft. Branch, Indiana where individual rows were selected at Ft. Branch, Indiana. In 1998-1999, the F4 generation was grown as a 3 row X 3 meter observation plot in both Windfall and Ft. Branch, Indiana locations. A meter section of the middle row was harvested from a selected plot and was threshed and bulked. In 1999-2000, a 7 row X 3 meter plot was planted in Windfall and Ft. Branch, Indiana where 50 spikes were harvested from the selected plot and threshed individually. In 2000-2001, 20 headrows of the F5 selection were grown at Windfall and Ft. Branch, Indiana. Selected rows from the Windfall, Indiana location were cut and threshed individually. Preliminary yield testing began in 2001-2002 of an F5 selection from an F6 headrow. This selection was designated W960964N1. Yield testing continued through the F13 generation in 2007-2008. Selection criteria included any or all of the following characteristics in the field: disease resistance, plant type, plant height, head type, straw strength, maturity, grain yield, test weight and milling and baking characteristics.

Tests & Trials: Test and trials occurred during the 2007-2008 growing season in Caledon, Ontario. Plots consisted of 6 rows with a row spacing of 30 cm and a row length of 6 metres. There were 3 replications. Results were supported by the official technical examination report #200700368 purchased from the Plant Variety Protection office in the USA.

Comparison tables for '25W36' with reference varieties '2737W' and 'Caledonia'

Flag leaf length (cm)

  '25W36' '2737W' 'Caledonia'
mean 14.4 16.6 19.3
std. deviation 1.8 2.2 2.8

Flag leaf width (mm)

  '25W36' '2737W' 'Caledonia'
mean 12.2 13.8 14.8
std. deviation 1.1 0.9 1.3

Click on image for larger view
Wheat: '25W36' (left) with reference varieties '2737W' (centre) and 'Caledonia' (right)

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