Denomination: 'PR4CN581'
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: 15-8670
Grant of Rights Date: 2017-08-25
Certificate Number: 5540
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 cotyledon of 'PR4CN581' is narrower and shorter than that of '5440'. The leaf of 'PR4CN581' is longer than those of 'PPS02-364' and 'PPS04-205'. The petiole of 'PR4CN581' is longer than that of 'PPS02-364'. 'PR4CN581' flowers later than 'PPS02-364' and '5440'. The petal of 'PR4CN581' is a wider than that of 'PPS02-364' and it is longer than those of 'PPS04-205' and '5440'. 'PR4CN581' has a longer beak than that of 'PPS04-205'. The pedicel of 'PR4CN581' is longer than those of 'PPS02-364' and 'PPS04-205'. 'PR4CN581' matures later than the reference varieties. At maturity, the plant of 'PR4CN581' is taller than that of 'PPS02-364'.


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

COTYLEDON: narrow to medium width, medium length

LEAF: medium green, medium to many lobes, undulating to rounded margin, low to medium density of shallow to medium depth margin dentations, medium length, narrow to medium width, medium length petiole

FLOWER PETAL: yellow, medium length and width

SILIQUE: semi-erect attitude, medium length, medium length beak, medium length pedicel
SEED COAT: black

AGRONOMIC CHARACTERISTICS: medium to good resistance to lodging
QUALITY CHARACTERISTICS: erucic acid is 0.01 % of total fatty acids, oil content is 46.2% of whole dried seed, protein is 41.0% of dried oil free meal, low glucosinolates (10.6 µmol/g)
CHEMICAL REACTION: resistant to glufosinate ammonium herbicides
DISEASE REACTION: resistant to Blackleg (Leptosphaeria maculans asexual stage: Phoma lingam)

Origin & Breeding History: 'PR4CN581' 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 CropScienc in Saskatoon, Saskatchewan, Canada in 2011 with the doubled haploid line being extracted in 2011. 'PR4CN581' was selected in 2014 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 'PR4CN581' with reference varieties 'PPS02-364', 'PPS04-205' and '5440'

Cotyledon length (mm)

  'PR4CN581' 'PPS02-364' 'PPS04-205' '5440'
mean (LSD=0.5) 12.1 11.8 11.4 13.6
std. deviation 1.4 1.1 0.9 0.7

Cotyledon width (mm)

  'PR4CN581' 'PPS02-364' 'PPS04-205' '5440'
mean (LSD=0.9) 22.1 21.5 20.9 24.9
std. deviation 1.5 1.5 1.3 2.2

Leaf length (cm)

  'PR4CN581' 'PPS02-364' 'PPS04-205' '5440'
mean (LSD=2.0) 21.7 17.6 19.1 20.7
std. deviation 2.7 2.6 2.4 2.7

Petiole length (cm)

  'PR4CN581' 'PPS02-364' 'PPS04-205' '5440'
mean (LSD=0.9) 10.3 7.2 9.2 9.7
std. deviation 2.8 2.6 2.5 2.4

Days to flower

  'PR4CN581' 'PPS02-364' 'PPS04-205' '5440'
mean 43 38 41 39

Flower petal length (mm)

  'PR4CN581' 'PPS02-364' 'PPS04-205' '5440'
mean (LSD=0.8) 16.3 15.2 13.1 14.9
std. deviation 1.7 2.1 1.0 1.6

Flower petal width (mm)

  'PR4CN581' 'PPS02-364' 'PPS04-205' '5440'
mean (LSD=0.5) 7.1 6.4 6.8 6.8
std. deviation 1.2 1.1 0.7 1.0

Beak length (mm)

  'PR4CN581' 'PPS02-364' 'PPS04-205' '5440'
mean (LSD=1.0) 12.7 13.7 11.2 11.1
std. deviation 1.9 2.2 1.5 2.1

Pedicel length (mm)

  'PR4CN581' 'PPS02-364' 'PPS04-205' '5440'
mean (LSD=2.8) 25.5 19.2 19.9 22.1
std. deviation 6.0 3.9 5.7 5.8

Days to maturity

  'PR4CN581' 'PPS02-364' 'PPS04-205' '5440'
mean 100 95 96 94

Plant height at maturity (cm)

  'PR4CN581' 'PPS02-364' 'PPS04-205' '5440'
mean (LSD=6.7) 132 120 124 133
std. deviation 10 13 12 12

Click on image for larger view
Canola: 'PR4CN581' (far left) with reference varieties 'PPS04-205' (centre left), 'PPS02-364' (centre right) and '5440' (far right)

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