25R56

Wheat

Denomination: '25R56'
Botanical Name: Triticum aestivum
Applicant/Holder: Pioneer Hi-Bred International, Inc.
8305 NW 62nd Avenue
P.O. Box 7060
Johnston, Iowa
50131
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
Canada
Tel: 905-843-9166
Application Date: 2007-05-01
Application Number: 07-5905
Grant of Rights Date: 2009-02-13
Certificate Number: 3445
Exemption from compulsory licensing: Yes
Expiry date for exemption from compulsory licensing: 2011-02-13
Date rights surrendered: 2016-08-19

Variety Description

Varieties used for comparison: '25R49' and '25R57'

Summary: '25R56' differs from the reference varieties, '25R49' and '25R57', mainly in frequency of plants with recurved/drooping flag leaves, glaucosity of the flag leaf sheath, plant height, spike attitude, hairiness of the convex surface of the apical rachis segment and lemma beak shape. The frequency of plants with recurved/drooping flag leaves is absent to very weak in '25R56' whereas it is high in '25R49'. The flag leaf sheaths of '25R56' have strong glaucosity whereas it is weak in '25R49' and medium in '25R57'. The plants of '25R56' are shorter than those of both reference varieties. At maturity, spike attitude of '25R56' is nodding whereas it is inclined in '25R57'. The hairiness of the convex surface of the apical rachis segment of '25R56' is medium whereas it is absent or very sparse in '25R49' and sparse in '25R57'. The lemma beak of '25R56' is straight whereas it is moderately curved in '25R49' and sligthly curved in '25R57'.

Description:

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

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

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

SPIKE: tapering, dense, nodding attitude at maturity, weak glaucosity, white at maturity, very short awnlets, medium hairiness of convex surface of apical rachis segment
LOWER GLUME: medium in width and length, glabrous, slightly sloping and narrow shoulder, straight to slightly curved and short beak, moderately dense internal hair
LEMMA: straight beak

KERNEL: soft red type, light red, small to medium in size, medium in length and width, oval, rounded cheek, midlong brush hairs, medium size oval germ, crease narrow and shallow, medium phenol colouration

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

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

Origin & Breeding History: The wheat variety '25R56' is a soft red winter wheat (Triticum aestivum L.) developed by Pioneer Hi-Bred International, Inc. '25R56' was developed from the three parent cross WBJ0249B1/WBE0235B1//25R57 sib., made in 1994. The single cross, WBJ0249B1/WBE0235B1 was made during the 1994 spring greenhouse cycle and was designated 'W942378'. During the 1994 fall greenhouse cycle the F1, 'W942378', was crossed with a 25R57 sibling and the final cross was designated W950517. An F5 selection, designated W950517A1, was moved to advanced yield testing on the F7 to F13 conducted from 2000 to 2006.

Tests & Trials: Trials for '25R56' were conducted during the 2006-2007 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 '25R56' was purchased from the United States Plant Variety Protection Office.


Comparison tables for '25R56' with reference varieties '25R49' and '25R57'

Flag leaf width (mm)

  '25R56' '25R49' '25R57'
mean 14.0 13.0 15.0
std. deviation 1.2 1.0 1.0

Plant height (cm)

  '25R56' '25R49' '25R57'
mean 74.1 79.3 83.2
std. deviation 3.2 3.8 2.6

Spike length (cm)

  '25R56' '25R49' '25R57'
mean 8.9 8.8 9.7
std. deviation 0.5 0.6 0.6

Click on image for larger view
25R56
Wheat: '25R56' (left) with reference varieties, '25R49' (centre) and '25R57' (right)

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