Denomination: 'PR3CN556'
Botanical Name: Brassica napus
Applicant/Holder: Bayer CropScience Inc.
Site 600, R.R. #6
P.O. Box 117
Saskatoon, Saskatchewan
S7K 3J9
Breeder: Stewart Brandt, Bayer CropScience Inc., Saskatoon, Saskatchewan
Application Date: 2015-06-23
Application Number: 15-8668
Grant of Rights Date: 2017-08-25
Certificate Number: 5538
Exemption from compulsory licensing: Yes
Expiry date for exemption from compulsory licensing: 2019-08-25
Grant of Rights Termination Date: 2037-08-25

Note: The applicant has requested an exemption from compulsory licensing to allow time to multiply and distribute propagating material of the variety. If the exemption is granted, it may be allowed for two years from the date rights are granted for the variety.

Variety Description

Varieties used for comparison: 'PPS02-364', 'PPS04-205' and '5440'

Summary: The leaf and petiole of 'PR3CN556' are longer than that of 'PPS02-364'. 'PR3CN556' flowers later than that of 'PPS02-364'. The petal of 'PR3CN556' is longer than 'PPS04-205' and it is wider than those of 'PPS02-364' and '5440'. The silique and beak of 'PR3CN556' are shorter than that of 'PPS02-364'. 'PR3CN556' has a longer pedicel than that of 'PPS02-364'. At maturity, the plant of 'PR3CN556' is taller than that of 'PPS02-364'.


PLANT: male fertile restorer inbred line, spring type, medium to tall at maturity

COTYLEDON: medium width and length

LEAF: medium green, medium number of lobes, rounded margin, medium density of medium depth margin dentations, medium length, narrow to medium width, medium length petiole

FLOWER PETAL: yellow, medium length and width

SILIQUE: horizontal attitude, short to medium length, short to medium length beak, short to medium length pedicel
SEED COAT: black

AGRONOMIC CHARACTERISTICS: medium to good resistance to lodging
QUALITY CHARACTERISTICS: erucic acid is 0.02 % of total fatty acids, oil content is 48.5% of whole dried seed, protein is 38.4% of dried oil free meal, very low glucosinolates (7.3 µmol/g)
CHEMICAL REACTION: resistant to glufosinate ammonium herbicides
DISEASE REACTION: resistant to Blackleg (Leptosphaeria maculans asexual stage: Phoma lingam)

Origin & Breeding History: 'PR3CN556' is a restorer line in the process of F1 hybrid production. It was derived as a doubled haploid line containing the Rf3 gene construct in homozygous state. The cross was made at Bayer CropScience in Saskatoon, Saskatchewan, Canada in 2006 with the doubled haploid line being extracted in 2009. 'PR3CN556' was selected in 2013 on the basis of fertility restoration of numerous male sterile lines and expression of tolerance to glufosinate-ammonium herbicide. Other selection parameters included height, vigour, maturity, blackleg resistance, oil content, fatty acid profile, glucosinolate content and combining ability.

Tests & Trials: The comparative trials conducted during the summers of 2014 and 2015 in Saskatoon, Saskatchewan were set up in a RCB Design with 3 replications per variety. Each year, the plots consisted of 3 rows that were 6 metres in length with a spacing of 25 cm between rows and 50 cm between plots. The measured characteristics were based on 30 measurements of the cotyledon, leaf, flower and plant height and 60 measurements of the silique. The means were based on a two year average. Mean differences were significant at the 2% probability level based on LSD values.

Comparison tables for 'PR3CN556' with reference varieties 'PPS02-364', 'PPS04-205' and '5440'

Leaf length (cm)

  'PR3CN556' 'PPS02-364' 'PPS04-205' '5440'
mean (LSD=2.0) 21.9 17.6 19.1 20.7
std. deviation 2.7 2.6 2.4 2.7

Petiole length (cm)

  'PR3CN556' 'PPS02-364' 'PPS04-205' '5440'
mean (LSD=0.9) 10.1 7.2 9.2 9.7
std. deviation 2.9 2.6 2.5 2.4

Days to flower

  'PR3CN556' 'PPS02-364' 'PPS04-205' '5440'
mean 42 38 41 39

Flower petal length (mm)

  'PR3CN556' 'PPS02-364' 'PPS04-205' '5440'
mean (LSD=0.8) 14.9 15.2 13.1 14.9
std. deviation 1.1 2.1 1.0 1.6

Flower petal width (mm)

  'PR3CN556' 'PPS02-364' 'PPS04-205' '5440'
mean (LSD=0.5) 7.5 6.4 6.8 6.8
std. deviation 1.0 1.1 0.7 1.0

Silique length (mm)

  'PR3CN556' 'PPS02-364' 'PPS04-205' '5440'
mean (LSD=3.5) 57.3 64.6 56.5 60.2
std. deviation 3.8 6.7 7.2 8.6

Beak length (mm)

  'PR3CN556' 'PPS02-364' 'PPS04-205' '5440'
mean (LSD=1.0) 10.3 13.7 11.2 11.1
std. deviation 1.5 2.2 1.5 2.1

Pedicel length (mm)

  'PR3CN556' 'PPS02-364' 'PPS04-205' '5440'
mean (LSD=2.8) 21.8 19.2 19.9 22.1
std. deviation 4.7 3.9 5.7 5.8

Plant height at maturity (cm)

  'PR3CN556' 'PPS02-364' 'PPS04-205' '5440'
mean (LSD=6.7) 131 120 124 133
std. deviation 12 13 12 12

Click on image for larger view
Canola: 'PR3CN556' (far left) with reference varieties 'PPS04-205' (centre left), 'PPS02-364' (centre right) and '5440' (far right)

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