CB 7520

Sorghum

Denomination: 'CB 7520'
Previously Proposed Denomination: 'ES5200'
Botanical Name: Sorghum bicolor
Applicant/Holder: Ceres, Inc.
1535 Rancho Conejo Boulevard
Thousand Oaks, California
91320
United States of America
Breeder: Clinton Jay Johnson, Happy, United States of America
Agent in Canada: Variety Rights Management
475 County Road 18
R.R. #2
Oxford Station, Ontario
K0G 1T0
Canada
Tel: 613-258-9015
Application Date: 2010-02-09
Application Number: 10-6817
Date Withdrawn: 2014-01-20

Variety Description

Variety used for comparison: 'ES5150'

Summary: The intensity of anthocyanin colouration on the coleoptile, on the dorsal side and on the sheath of the first leaf of 'CB 7520' is very weak whereas it is weak to medium on 'ES5150'. In 2012, no panicles developed on the plants of 'CB 7520' before the end of the growing season whereas they developed late in the season on 'ES5150'. The leaves of 'CB 7520' are longer and wider than those of 'ES5150'. The stem diameter of 'CB 7520' is large to very large whereas it is medium on 'ES5150'.

Description:

PLANT: hybrid, biomass production type
SEEDLING: very weak intensity of anthocyanin colouration of coleoptile
INTENSITY OF ANTHOCYANIN COLOURATION OF FIRST LEAF: very weak on dorsal side and on sheath

LEAF BLADE: absent or very weak intensity of anthocyanin colouration, medium intensity of green colour
STEM: large to very large diameter

Origin & Breeding History: 'CB 7520' was derived by a double cross hybridization conducted in Maricopa, Arizona, USA in 2008. The female parent, 'BTx623', was crossed with the male maintainer parent 'ATx2752', to produce a cytoplasmic male sterile female F1 parent. The F1 female parent was crossed with the inbred male parent restorer sorghum line, 'R07007'. 'CB 7520' was selected in 2008 for its biomass production and conversion characteristics and for its inability to produce grain heads until very late in the season, if at all.

Tests & Trials: The tests and trials for 'CB 7520' were conducted during the summers of 2011 and 2012 in Oxford Station, Ontario. In 2011, there were 2 replicates per variety consisting of 11 rows per replicate, with a row length of 3.5 metres and a row spacing of 20 cm. Plants were spaced approximately 35cm apart in the rows. Seed was directly sown into the plots in mid-June followed by very cool and damp growing conditions throughout the 2011 growing season. In 2012, there were 2 replicates per variety consisting of 9 rows per replicate, with a row length of 6 metres and a row spacing of 60 cm. Plants were spaced approximately 60 cm apart in the rows. Seed was sown/germinated in peat plugs in early spring which were transplanted into the plots the first week of June. Growing conditions in 2012 were hot and dry, more conducive to the development of this type of variety. Both years, measured characteristics were based on 30 measurements.


Comparison tables for 'CB 7520' with reference variety 'ES5150'

Total plant height (metres)

  'CB 7520' 'ES5150'
mean 2011 0.81 0.79
std. deviation 2011 0.07 0.04
mean 2012 2.55 2.83
std. deviation 2012 0.19 0.21

Length of leaf blade (third leaf from top) (cm)

  'CB 7520' 'ES5150'
mean 2011 58.30 43.40
std. deviation 2011 3.91 3.38
mean 2012 116.85 85.13
std. deviation 2012 6.57 6.12

Width of leaf blade (third leaf from top) (cm)

  'CB 7520' 'ES5150'
mean 2011 4.77 4.43
std. deviation 2011 0.77 0.48
mean 2012 8.23 4.99
std. deviation 2012 0.65 0.87

Click on image for larger view
CB 7520
Sorghum: 'CB 7520' (left) with reference variety 'ES5150' (right)

Click on image for larger view
CB 7520
Sorghum: 'CB 7520' (left) with reference variety 'ES5150' (right)

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