OAC Ramsay

Soybean

Variety Description

Varieties used for comparison: 'OAC Brooke', 'OAC Kent' and 'OAC Marvel'

Summary: When 95% of the pods are ripe, the plants of 'OAC Ramsey' are taller than those of the reference varieties. At 50% flowering, the terminal leaflet of 'OAC Ramsey' is shorter than the terminal leaflet of 'OAC Marvel'. The flower colour of 'OAC Ramsey' is white whereas it is violet for 'OAC Kent' and 'OAC Marvel'.

Description:

PLANT: oilseed type, indeterminate growth type, semi-erect growth habit, grey pubescence on middle third of main stem, begins flowering mid-season, matures very late

HYPOCOTYL: anthocyanin colouration present

LEAF: medium to strong blistering, medium intensity of green
LATERAL LEAFLET: pointed ovate, medium size
TERMINAL LEAFLET: ovoid, medium size

FLOWER: white

SEED: yellow ground colour of testa, weak glaucosity, opaque to intermediate glossiness of testa
HILUM: yellow
FUNICLE: same colour as testa

Origin & Breeding History: 'OAC Ramsay' originated from the cross between 'OAC Starfield' and 'SC2307' made in 2008 at the University of Guelph, Guelph, Ontario. The F1 seeds were grown in a growth room at the University of Guelph, Guelph campus to the first trifoliate stage and transplanted to a nursery in Ridgetown, Ontario in 2008. The F2 and F3 populations were advanced using a modified single-seed descent method, in which one pod was harvested from each plant and the seeds were saved for replanting and establishing the next generation in a winter nursery in Guanacaste, Costa Rica during winter 2008. In 2009, the F4 seeds were space planted in Ridgetown and selections were made based on maturity and agronomic performance. In 2010, the five selected lines were grown in 4 metre plant rows in Ridgetown and further selections were made based on lodging resistance, plant height, and bottom pod height. Line selections were bulked again and were further evaluated for yield, agronomic characteristics, and seed quality traits in preliminary yield trials conducted in 2011. Further selections were made among the F4:6 and F4:7 lines for desirable agronomic traits. Seeds of individual F4:8 plants were evaluated for uniformity and 43 plants were selected for further purification and pre-breeder seed production in 2013. Breeder seed was produced by bulking seeds of 23 uniform plots of F4:9 plants in 2014.

Tests & Trials: The trials for 'OAC Ramsay' were conducted in St. Thomas, Ontario during the 2018 and 2019 growing seasons.The 2018 plots consisted of 4 rows per variety with a row spacing of 43 centimetres and a row length of 1.5 metres. The 2019 plots consisted of 1 row, 9 metres in length per variety. Both 2018 and 2019 trials were aranged in a 3 replicates RCB design. Measurements were taken from 20 plants or parts of 20 plants of each variety per yearMean differences were significant at the 5% confidence probability level based on a paired Student`s t-test.

Comparison tables for 'OAC Ramsay' with reference varieties 'OAC Brooke', 'OAC Kent' and 'OAC Marvel'

Plant height (cm)

Terminal leaflet length (cm)

Click on image for larger view

Soybean: 'OAC Ramsay' (left) with reference varieties 'OAC Brooke' (centre left), 'OAC Kent' (centre right) and 'OAC Marvel' (right)