Denomination: '25W43'
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: 08-6344
Grant of Rights Date: 2009-08-10
Certificate Number: 3554
Date rights surrendered: 2016-08-10

Variety Description

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

Summary: '25W43' has strong intensity of anthocyanin colouration of the coleoptile while it is absent in '2737W' and 'Caledonia'. The flag leaf of '25W43' is shorter and narrower than 'Caledonia'. '25W43' has stronger anthocyanin colouration of the flag leaf auricle than the reference varieties. The culm of '25W43' has a weaker glaucosity than the reference varieties. '25W43' has anthocyanin colouration of the straw at maturity while the reference varieties do not. The spike of '25W43' is denser than 'Caledonia'. '25W43' has a spike with a greater nodding attitude at maturity than the reference varieties. The spike of '25W43' has weaker glaucosity than '2737W'. '25W43' has a denser hairiness of the convex surface of the apical rachis segment than 'Caledonia'. The lower glume of '25W43' is shorter than '2737W'. '25W43' has a straight shape to the shoulder of the lower glume while it is sloping in '2737W'. The shoulder width of the lower glume of '25W43' is narrower than 'Caledonia'. '25W43' has sparser internal hairs of the lower glume than '2737W'. The beak shape of the lemma of '25W43' is slightly curved while it is moderately curved in 'Caledonia'. '25W43' has an oval shaped kernel while it is broad elliptical in 'Caledonia'. The kernel embryo of '25W43' is oval while it is round in 'Caledonia'.


PLANT: winter type, semi-erect growth habit
SEEDLING: strong anthocyanin colouration of the coleoptile

FLAG LEAF: low frequency of plants with recurved/drooping flag leaves, absent or 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, anthocyanin colouration present at maturity

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

KERNEL: soft white type, white colour, medium size kernel, midlong, midwide, oval shape, rounded cheek shape, midlong brush hairs, midsize germ, oval 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 Fusarium head blight (Fusarium graminearum, Fusarium species), moderately resistant to Leaf rust (Puccinia triticina) and Wheat soil borne Mosaic virus, moderately resistant to moderately susceptible to Septoria tritici blotch (Septoria tritici) Powdery mildew (Erysiphe graminis, f. sp. tritici) Stripe rust (Puccinia striiformis) and Spindle streak Mosaic virus

Origin & Breeding History: '25W43' (experimental designations W960937D1, XW05J) derives from the three-parent cross, SC8021V2/ 25W33/ WBL0305A1 made in 1995 at the Pioneer Hi-Bred station in Windfall, Indiana. SC8021V2 (PI 554142) was a white kerneled spring wheat germplasm line from Agiculture and Agri-Food Canada and WBL0305A1 = 2510 sib./ 3/ Aurora/ Tyler// 2553/ 2550 sib./ 4/ 2737W. The detailed pedigree is SC8021V2/ 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 Ft. Branch, 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 W960937D1. 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 #200700370 purchased from the Plant Variety Protection office in the USA.

Comparison tables for '25W43' with reference varieties '2737W' and 'Caledonia'

Flag leaf length (cm)

  '25W43' '2737W' 'Caledonia'
mean 16.3 16.6 19.3
std. deviation 1.9 2.2 2.8

Flag leaf width (mm)

  '25W43' '2737W' 'Caledonia'
mean 12.8 13.8 14.8
std. deviation 2.3 0.9 1.3

Click on image for larger view
Wheat: '25W43' (left) with reference varieties '2737W' (centre) and 'Caledonia' (right)

Date modified: