Denomination: '25R51'
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: 2006-05-05
Application Number: 06-5468
Grant of Rights Date: 2007-11-23
Certificate Number: 3025
Exemption from compulsory licensing: Yes
Expiry date for exemption from compulsory licensing: 2009-11-23
Date rights surrendered: 2016-08-19

Variety Description

Varieties used for comparison: '25R35' and '25W41'

Summary: The flag leaf of '25R51' is shorter and less often drooping that of '25R35'. Heading occurs earlier in plants of '25R51' than in the reference varieties. The spike of '25R51' is longer than that of '25W41'. The beak of the lower glume of '25R51' is longer than in the reference varieties. The kernel of '25R51' is of the soft red type, whereas that of '25W41' is of the soft white type. '25R51' is more tolerant to stripe rust and less resistant to Spindle streak mosaic virus than '25R35' and '25W41'.


PLANT: winter type, semi-erect, mid-season
SEEDLING: absent or very weak anthocyanin colouration of the coleoptile, glabrous sheath of lower leaves, glabrous blade of lower leaves

FLAG LEAF: absent or very low frequency of plants with recurved/drooping flag leaf, glabrous blade, glabrous sheath, absent or very weak anthocyanin colouration on auricles, weak glaucosity of sheath

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

SPIKE: parallel sided, medium to dense, nodding attitude at maturity, weak glaucosity, white at maturity, sparse hairiness on convex surface of apical rachis segment
AWNS: medium to long, moderately spreading, white
LOWER GLUME: medium in width, medium in length, glabrous, slightly sloping and narrow shoulder, slightly curved and very long beak, moderately dense internal hair
LEMMA: straight beak

KERNEL: soft red type, medium red in colour, small to medium in size, medium in length and width, elliptical, rounded cheek, medium long brush hairs, medium size oval germ, crease narrow to medium in width and medium in depth, dark phenol colouration

AGRONOMIC TRAITS: fair winter survival, moderate pre-harvest sprouting tendency
QUALITY CHARACTERISTICS: fair pastry and biscuit quality

DISEASE REACTION: slightly resistant to Septoria tritici blotch (Septoria tritici), moderately susceptible to powdery mildew (Erysiphe graminis, f.sp. tritici), resistant to moderately resistant to Fusarium head blight (Fusarium graminearum), moderately resistant to Leaf rust (Puccinia triticina) and Stripe rust (Puccinia striiformis), susceptible to Spindle Streak Mosaic Virus, moderately susceptible to susceptible to Soil Borne Mosaic Virus.

Origin & Breeding History: The wheat variety '25R51' is a soft red winter wheat (Triticum aestivum L.) developed by Pioneer Hi-Bred International, Inc.. Using a modified pedigree selection, '25R51' was developed from the three parent cross WBI1097S1/'25R18' sib.//2571, made in the fall of 1995. WBI1097S1 is an experimental line derived from the cross WBZ053G//2555/Hart//2550. WBZ053G is an experimental line derived from the cross 'Kavkaz'/'Hart'//2550. The detailed parentage of the new variety is Kavkaz/Hart//2550/3/2555 sib./2548/4/25R18 sib/5/2571. F4 plants were evaluated for fusarium head blight resistance in 1998. Yield tests were conducted on the F6 to F12 from 1999 to 2006.

Tests & Trials: Trials for '25R51' were conducted during the 2005-2006 growing season in Caledon, Ontario. The candidate and two reference varieties were planted in three replicate blocks, the second and third blocks being randomized. Plots were 6 metres long and 1.5 metres wide, with 2600 seeds per plot, and included six rows 30 cm apart. Observations were made throughout the season at appropriate times on the entire plot, and measurements were taken on 8 plants per plot, 24 plants total per variety. The first year of data for '25R51' was purchased from the U.S. Plant Variety Protection Office.

Comparison tables for '25R51' with reference varieties '25R35' and '25W41'

Length of flag leaf (cm)

  '25R51' '25R35' '25W41'
mean 15.6 20.9 14.1
std. deviation 2.1 2.1 1.2

Length of spike (cm)

  '25R51' '25R35' '25W41'
mean 8.2 8.9 6.8
std. deviation 0.4 0.5 0.4
Protein content (%) 7.6 8.1 7.9

Click on image for larger view
Wheat: '25R51' (left) with reference varieties '25R35' (centre) and '25W41' (right)

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