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OAC Merion


Denomination: 'OAC Merion'
Previously Proposed Denomination: 'RCAT0602'
Botanical Name: Glycine max
Applicant/Holder: University of Guelph
Research Innovation Office
Building #92, 50 Stone Road East
Guelph, Ontario
N1G 2W1
Breeder: Gary Ablett, Ridgetown College, University of Guelph, Ridgetown, Ontario
Application Date: 2008-06-06
Application Number: 08-6365
Date Withdrawn: 2011-11-23

Variety Description

Varieties used for comparison: 'OAC Huron', 'DH410' and 'Katrina'

Summary: 'OAC Merion' has no anthocyanin colouration of the hypocotyl while 'DH410' has medium anthocyanin colouration. The leaf of 'OAC Merion' is dark green at flowering while it is medium green for 'Katrina' and light green for 'OAC Huron' and 'DH410'. 'OAC Merion' has a pointed ovate lateral leaflet while it is rounded ovate in shape for the reference varieties. The leaf blistering of 'OAC Merion' is medium while it is weak in 'OAC Huron' and absent or very weak in 'DH410'. 'OAC Merion' flowers earlier than 'Katrina'. The flower colour of 'OAC Merion' is white while it is purple in 'DH410'. 'OAC Merion' has a shorter plant height at maturity than 'DH410' and 'Katrina'. At maturity, the pod colour of 'OAC Merion' is tan while it is brown for 'Katrina'. 'OAC Merion' has a lower 100 seed weight than 'OAC Huron'. The seed of 'OAC Merion' has a dull lustre while it is shiny in 'DH410' and 'Katrina'. 'OAC Merion' has a yellow ground colour of the testa while it is light brown in 'Katrina'. The hilum of 'OAC Merion' is yellow while it is imperfect yellow in 'Katrina'. 'OAC Merion' has a small hilum while it is medium sized in 'OAC Huron' and 'Katrina'. The abscission layer is normal in 'OAC Merion' while it is lacking in 'DH410'. 'OAC Merion' matures later than 'DH410'. The seed of 'OAC Merion' has lower protein than 'DH410'.


HYPOCOTYL: anthocyanin colouration absent

PLANT: indeterminate growth type, semi-erect growth habit, grey pubescence on middle third of main stem

LEAF: dark green at flowering, pointed ovate lateral leaflet shape, medium blistering

FLOWER: white

POD: tan

SEED: spherical rounded shape, medium size, dull lustre, yellow ground colour of testa, very small yellow hilum, yellow funicle, abscission layer normal

AGRONOMY: 2950 heat unit rating, good resistance to lodging

DISEASE REACTION: moderately resistant to Phytophthora rot (Phytophthora megasperma F. sp. glycinea), susceptible to cyst nematode race 3 (Heterodera glycines)

QUALITY: 42.4% protein, 18.4% oil

Origin & Breeding History: 'OAC Merion' (experimental designation RCAT 0602) was derived from the cross CK-01 x A95-583010 made in 1999 at the University of Guelph, Guelph, Ontario. The early generations were advanced using the modified single seed descent method until the F4 generation where a single plant was selected for maturity and agronomic traits. The seed from this plant was harvested and maintained through pedigree selection until F4:F6 generation when 62 plants were selected for morphological uniformity. Each of these 62 plants were grown in separate breeder rows the following year. Fifty breeder rows were eventually bulked in the F8 generation in 2007 to produce breeder seed. 'OAC Merion' was evaluated in the Ontario Soybean Variety Trials in the 2800 Heat Unit Testing Area in 2006 and 2007.

Tests & Trials: Tests and Trials were conducted during the summers of 2008 and 2009 in Ridgetown, Ontario. In 2008, plots consisted of 5 rows with a row length of 3.8 meters and a row spacing of 42 cm. There were 3 replicates. In 2009, plots consisted of 12 rows with a row length of 6 meters and a row spacing of 18-20 cm. There were 3 replicates.

Comparison tables for 'OAC Merion' with reference varieties 'OAC Huron', 'DH410' and 'Katrina'

Days to flowering

  'OAC Merion' 'OAC Huron' 'DH410' 'Katrina'
mean 39 38 38 41

Plant height at maturity (cm)

  'OAC Merion' 'OAC Huron' 'DH410' 'Katrina'
mean 81 84 93 90
std. deviation 10.724 9.684 9.855 9.714

100 Seed weight (gms)

  'OAC Merion' 'OAC Huron' 'DH410' 'Katrina'
mean 16.7 19.7 16.7 17.3

Days to maturity

  'OAC Merion' 'OAC Huron' 'DH410' 'Katrina'
mean 112 111 110 111

Protein content (%)

  'OAC Merion' 'OAC Huron' 'DH410' 'Katrina'
mean 42.4 43.8 45.6 44.0

Click on image for larger view
OAC Merion
Soybean: 'OAC Merion' (bottom left) with reference varieties 'Katrina' (bottom right), 'DH410' (top left) and 'OAC Huron' (top right)

Click on image for larger view
OAC Merion
Soybean: 'OAC Merion' (left) with reference variety 'DH410' (right)

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