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CDC Ascent


Denomination: 'CDC Ascent'
Botanical Name: Hordeum vulgare
Applicant/Holder: University of Saskatchewan
Crop Development Centre
4D36 Agriculture Building, 51 Campus Drive
Saskatoon, Saskatchewan
S7N 5A8
Breeder: Aaron Beattie, University of Saskatchewan, Saskatoon, Saskatchewan
Agent in Canada: SeCan Association
400 - 300 Terry Fox Drive
Kanata, Ontario
Tel: 613-592-8600 x 247
Application Date: 2016-06-23
Provisional Protection:: 2016-06-23
Application Number: 16-8945
Grant of Rights Date: 2018-02-19
Certificate Number: 5663
Grant of Rights Termination Date: 2038-02-19

Variety Description

Varieties used for comparison: 'CDC McGwire' and 'CDC Rattan'

Summary: The flag leaves of 'CDC Ascent' are longer and wider than those of 'CDC Rattan'. At the end of anthesis, the spike attitude of 'CDC Ascent' is semi-erect to horizontal whereas it is erect to semi-erect for 'CDC Rattan'. The plants of 'CDC Ascent' are shorter than those of 'CDC McGwire'. The spike of 'CDC Ascent' is shorter than that of 'CDC McGwire' and 'CDC Rattan'. The curvature of the first segment of the rachis of 'CDC Ascent' is weak whereas it is medium for 'CDC McGwire'.


PLANT: two row, spring barley, low to medium frequency of plants with recurved flag leaves
YOUNG PLANT (at tillering): semi-erect to intermediate growth habit, absent or very sparse pubescence on lower leaf sheaths

FLAG LEAF BLADE: absent or very sparse pubescence
FLAG LEAF SHEATH: medium glaucosity, absent or very sparse pubescence
AURICLES: weak intensity of anthocyanin colouration, very sparse pubescence on the margins

SPIKE: emerges mid-season, medium glaucosity, semi-erect to horizontal attitude, platform to cup shaped collar, parallel shape, lax density, parallel to weakly divergent attitude of sterile spikelet, glume and awn of median spikelet are equal to length of grain
FIRST SEGMENT OF RACHIS: short, weak curvature
LEMMA AWNS: medium intensity of anthocyanin colouration of tips, longer than length of spike, rough spiculation on margins along entire length

KERNEL: absent or very weak anthocyanin colouration of nerves of lemma at early to soft dough stage, whitish aleurone layer, long rachilla hairs, husk absent, medium spiculation of inner lateral nerves of dorsal side of lemma, no hairiness of ventral furrow, clasping disposition of lodicules, transverse crease to incomplete horseshoe shape basal markings, short to medium length, medium width

AGRONOMY: fair to good resistance to lodging, good resistance to shattering, good tolerance to straw breakage, fair to good drought tolerance
DISEASE REACTION: moderately resistant to True loose smut (Ustilago nuda)

Origin & Breeding History: 'CDC Ascent' (experimental designations 'HB13324', 'SH100049') originated from the cross 'SH05256' x 'CDC Austenson' made in a greenhouse at the Crop Development Centre, University of Saskatchewan, Saskatoon, Saskatchewan in 2006 using a bulk breeding system. Both the F1 and F2 generations were grown as bulk populations in a winter nursery in New Zealand in 2006-07 and in Saskatoon in 2007 respectively. The seed was returned to New Zealand during the winter of 2007-08 to grow as an F3 bulk population with the subsequent F4 grown as a space planted population in Saskatoon in 2008. Individual spikes were harvested and selected for general seed characteristics and then grown in the field as F5 hill plots in Saskatoon in 2009. Seed from the selected F5 hill plot was bulked as the line that became known as 'SH100049'. It was tested in the Crop Development Centre yield trials from 2010 to 2012 followed by testing in the Western Cooperative Hulless Barley Registration Trials as 'HB13324' during 2013 and 2014. Selection criteria included yield, threshability, disease resistance and grain quality.

Tests & Trials: The comparative trials were conducted at the University of Saskatchewan Crop Science Field Laboratory in Saskatoon, Saskatchewan during the 2015 and 2016 growing seasons. The trials were planted in a RCB design and consisted of 4 replicates for each variety. Each plot consisted of 5 rows 3.66 metres in length with a row spacing of 0.2 metres. The planting density was 215 plants per square metre. Measured characteristics were based on a minimum of 20 measurements each year. The mean differences were significant to at least a 5% probability level based on a paired Student's t-test.

Comparison tables for 'CDC Ascent' with reference varieties 'CDC McGwire' and 'CDC Rattan'

Flag leaf length (cm)

  'CDC Ascent' 'CDC McGwire' 'CDC Rattan'
mean 2015 14.4 13.3 10.6
std. deviation 2015 2.2 2.1 1.8
mean 2016 11.52 10.95 8.91
std. deviation 2016 1.32 1.66 1.22

Flag leaf width (mm)

  'CDC Ascent' 'CDC McGwire' 'CDC Rattan'
mean 2015 6.90 6.80 5.30
std. deviation 2015 1.4 1.1 1.7
mean 2016 7.95 7.60 6.45
std. deviation 2016 0.83 0.99 0.60

Plant height (including awns) (cm)

  'CDC Ascent' 'CDC McGwire' 'CDC Rattan'
mean 2015 80.6 87.0 79.5
std. deviation 2015 5.6 3.8 4.6
mean 2016 78.9 82.3 70.4
std. deviation 2016 2.6 3.0 2.9

Spike length (excluding awns) (cm)

  'CDC Ascent' 'CDC McGwire' 'CDC Rattan'
mean 2015 8.66 9.70 9.24
std. deviation 2015 0.79 1.06 0.60
mean 2016 9.15 10.41 9.59
std. deviation 2016 0.59 1.06 0.76

Click on image for larger view
CDC Ascent
Barley: 'CDC Ascent' (centre) with reference varieties 'CDC McGwire' (left) and 'CDC Rattan' (right)

Click on image for larger view
CDC Ascent
Barley: 'CDC Ascent' (centre) with reference varieties 'CDC McGwire' (left) and 'CDC Rattan' (right)

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