PB8CN257

Canola

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 'PB8CN257' is shorter than those of 'PB1CN231' and '5440'. The plants of 'PB8CN257' flower earlier than the plants of the reference varieties. The petal of 'PB8CN257'is shorter than that of '5440'. The silique of 'PB8CN257' has a longer beak than that of 'PPS01-140 B-Line'. The plants of 'PB8CN257' mature earlier than the plants of 'PB1CN231' and '5440'. At maturity, the plants of 'PB8CN257' are shorter than the plants of '5440'. The seed coat of 'PB8CN257' is black whereas it is brown for 'PB1CN231'.

Description:

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

COTYLEDON: medium length and width

LEAF: medium green, many lobes, rounded margin, medium density of medium depth margin indentations, medium length and width, short to medium length petiole

FLOWER PETAL: yellow, medium length, narrow to medium width

SILIQUE: semi-erect to horizontal attitude, very short to short, short beak, short pedicel
SEED COAT: black

AGRONOMIC CHARACTERISTICS: medium to good resistance to lodging, good resistance to shattering

QUALITY CHARACTERISTICS: erucic acid is 0.03% of total fatty acids, oil content is 47.8% of whole dried seed, protein is 45.4% of dried oil free meal, low concentration of glucosinolates (10.0 µmol/g)

CHEMICAL REACTION: susceptible to glufosinate ammonium herbicides

DISEASE REACTIONS: moderately resistant to Blackleg (Leptosphaeria maculans asexual stage: Phoma lingam); tolerant to Clubroot (Plasmodiophora brassicae)

Origin & Breeding History: 'PB8CN257' is the male fertile maintainer line of 'PA8CN157'. It is a non-transgenic selected line which was derived by crossing an inbred line containing the Ms8 gene to a donor line, which was then used as a recurring parent in a backcrossing scheme. The initial cross and subsequent backcross were conducted in Gent, Belgium in 2016 and 2017, respectively. 'PB8CN257' was selected in 2017 on the basis of per se performance, expression of tolerance to glyphosate herbicide, vigour, maturity, blackleg resistance, clubroot tolerance, seed pod shattering resistance, oil content, fatty acid profile and glucosinolate content. Breeder seed production commenced in Saskatoon, Saskatchewan, Canada in 2017.

Tests & Trials: The comparative trials for 'PB8CN257' were conducted during the 2019 and 2021 growing seasons in Saskatoon, Saskatchewan. Trials were arranged in a RCB design with 3 replications per variety. The plots consisted of 3 rows that were 6 metres in length with spacing of 25 cm between rows and 50 cm between plots. The planting density resulted in a total of approximately 1300 plants per variety per year. The measured characteristics were based on 30 measurements except for the silique characteristics which were based on 60 measurements. 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 'PB8CN257' with reference varieties 'PB1CN231', 'PPS01-140 B-Line' and '5440'

Cotyledon length (mm)

Days to flowering (number of days from planting to when 50% of plants have one or more open flowers)

Flower petal length (mm)

Beak length (mm)

Days to maturity (number of days from planting to maturity)

Plant height (at maturity) (cm)

Click on image for larger view

Canola: 'PB8CN257' (left) with reference varieties 'PB1CN231' (centre left), 'PPS01-140 B-Line' (centre right) and '5440' (right)