Denomination: 'PB3CN257'
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: 15-8665
Grant of Rights Date: 2017-08-25
Certificate Number: 5535
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: 'PB1CN231', 'PPS01-140 B-Line' and '5440'

Summary: The cotyledon of 'PB3CN257' is wider than those of 'PB1CN231' and 'PPS01-140 B-Line'. The leaf margin of 'PB3CN257' is sharp whereas it is rounded for the reference varieties. 'PB3CN257' flowers earlier than the reference varieties. The petal of 'PB3CN257' is larger than that of 'PB1CN231'. The silique and pedicel of 'PB3CN257' are longer than those of 'PB1CN231' and 'PPS01-140 B-Line' whereas the pedicel is shorter than that of '5440'. 'PB3CN257' has a longer beak than the reference varieties. At maturity, the plant of 'PB3CN257' is shorter than the reference varieties. The seed coat of 'PB3CN257' is black whereas it is brown for 'PB1CN231'.


PLANT: male fertile inbred line, spring type, medium height at maturity

COTYLEDON: medium to wide, medium length

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

FLOWER PETAL: yellow, medium length and width

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

AGRONOMIC CHARACTERISTICS: fair resistance to lodging
QUALITY CHARACTERISTICS: no erucic acid, oil content is 45.9% of whole dried seed, protein is 43.6% of dried oil free meal, low glucosinolates (12.7 µmol/g)
CHEMICAL REACTION: susceptible to glufosinate ammonium herbicides
DISEASE REACTION: moderately resistant to Blackleg (Leptosphaeria maculans asexual stage: Phoma lingam)

Origin & Breeding History: 'PB3CN257' is the male fertile maintainer line of 'PA3CN157'. 'PB3CN257' is a fertile segregate that was derived by crossing isogenic lines. Crossing was done at Bayer CropScience in Saskatoon, Saskatchewan, Canada in 2011. 'PB3CN257' was selected in 2012 on the basis of per se performance, vigour, maturity, blackleg resistance, clubroot tolerance, increased seed pod shatter tolerance, oil content, fatty acid profile and glucosinolate content.

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 'PB3CN257' with reference varieties 'PB1CN231', 'PPS01-140 B-Line' and '5440'

Cotyledon width (mm)

  'PB3CN257' 'PB1CN231' 'PPS01-140 B-Line' '5440'
mean (LSD=0.9) 24.8 23.0 23.4 24.8
std. deviation 1.8 1.7 1.3 1.6

Days to flower

  'PB3CN257' 'PB1CN231' 'PPS01-140 B-Line' '5440'
mean 37 39 39 39

Flower petal length (mm)

  'PB3CN257' 'PB1CN231' 'PPS01-140 B-Line' '5440'
mean (LSD=1.0) 15.1 14.0 14.3 15.5
std. deviation 1.6 1.6 2.3 2.2

Flower petal width (mm)

  'PB3CN257' 'PB1CN231' 'PPS01-140 B-Line' '5440'
mean (LSD=0.7) 7.8 6.4 7.8 7.5
std. deviation 0.8 1.1 1.5 1.5

Silique length (mm)

  'PB3CN257' 'PB1CN231' 'PPS01-140 B-Line' '5440'
mean (LSD=3.4) 63.8 50.5 56.4 61.0
std. deviation 8.3 5.9 5.2 4.7

Beak length (mm)

  'PB3CN257' 'PB1CN231' 'PPS01-140 B-Line' '5440'
mean (LSD=1.2) 13.1 9.4 6.2 10.8
std. deviation 2.2 1.2 1.2 1.8

Pedicel length (mm)

  'PB3CN257' 'PB1CN231' 'PPS01-140 B-Line' '5440'
mean (LSD=1.5) 19.7 17.4 15.7 22.0
std. deviation 4.4 3.8 3.5 5.6

Plant height at maturity (cm)

  'PB3CN257' 'PB1CN231' 'PPS01-140 B-Line' '5440'
mean (LSD=5.2) 113 120 125 127
std. deviation 12 11 10 11

Click on image for larger view
Canola: 'PB3CN257' (far left) with reference varieties 'PPS01-140 B-Line' (centre left), 'PB1CN231' (centre right) and '5440' (far right)

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