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Denomination: '93Y20'
Botanical Name: Glycine max
Applicant/Holder: Pioneer Hi-Bred International, Inc.
8305 NW 62nd Avenue
P.O. Box 7060
Johnston, Iowa
United States of America
Breeder: Paul Stephens, Pioneer Hi-Bred International, Inc., Princeton, United States of America
Agent in Canada: Pioneer Hi-Bred Production LP
379 Springbank Ave.
P.O. Box 23040
Woodstock, Ontario
N4T 1R9
Tel: 519-533-5151
Application Date: 2009-03-13
Application Number: 09-6522
Grant of Rights Date: 2011-12-28
Certificate Number: 4251
Date rights revoked: 2013-12-28

Variety Description

Varieties used for comparison: '93Y02', '32-51R', 'RJS28001' and 'RJS31001'

Summary: The plants of '93Y20' are taller than those of '93Y02', '32-51R', and 'RJS31001'. '93Y20' has a spherical flattened seed shape while it is spherical rounded in '93Y02'. '93Y20' matures later than all the reference varieties.


HYPOCOTYL: anthocyanin colouration present, strong intensity of anthocyanin colouration
PLANT: indeterminate growth type, semi-erect growth habit, light tawny colour of hairs on middle third of main stem
LEAF: medium green, lanceolate lateral leaflet, medium blistering

FLOWER: purple

POD: brown
SEED: spherical flattened, small to medium size, dull coat lustre, yellow ground colour of testa, black hilum, medium size hilum, normal abscission layer of hilum

AGRONOMY: 3325 heat unit rating, insensitive photoperiod, good resistance to lodging

DISEASE REACTION: resistant to Phytophthora rot (Phytophthora megasperma F. sp. glycinea), resistant to soybean cyst nematode (Heterodera glycines)
QUALITY: 40.9% protein, 18.7% oil, mixed seed coat peroxidase acitvity

Origin & Breeding History: '93Y20' (experimental designations 'PH08307' and 'XB34R07') was derived from the cross 93B86/92M91 made in 2000 in Puerto Rico. The early generations were advanced using the modified single-seed descent. The F2 progeny row was grown in a plant row yield trial in Chili in the winter of 2002/2003. Subsequently, it has undergone five seasons of extensive testing and purification in the United States. A commercial number was assigned based on yield, soybean cyst nematode resistance (race 3), phytophthora resistance, sudden death syndrome tolerance, brown stem rot tolerance, frogeye leaf spot tolerance, and resistance to Roundup branded herbicides. The purification block was grown in 2005 in Illinois. In 2005/2006, 0.50 acre increase was grown in Argentina. In the summer of 2006, 21 acres of parent seed stock were grown. In the summer of 2007, 611 acres of seed stock and production seed were grown.

Tests & Trials: Tests and Trials were conducted during the summer of 2009 in Ridgetown, Ontario. Plots consisted of 2 rows with a row length of 5m and a row spacing of 76 cm. There were 3 replicates. Results were supported by the official technical examination report 200800095 purchased from the Plant Variety Protection Office in the USA.

Comparison tables for '93Y20' with reference varieties '93Y02', '32-51R', 'RJS28001' and 'RJS31001'

Plant height (cm)

  '93Y20' '93Y02' '32-51R' 'RJS28001' 'RJS31001'
mean 76 64 69 77 73
standard deviation 1.35 1.54 1.75 1.95 1.22

Maturity date

  '93Y20' '93Y02' '32-51R' 'RJS28001' 'RJS31001'
days 129 127 125 126 119

Click on image for larger view
Soybean: '93Y20' (bottom centre) with reference varieties 'RJS31001' (bottom left), 'RJS28001' (bottom right), '93Y02' (top left), and '32-51R' (top right)

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