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Denomination: '91Y80'
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: 2009-03-25
Application Number: 09-6568
Grant of Rights Date: 2012-02-06
Certificate Number: 4261
Date rights revoked: 2014-02-06

Variety Description

Varieties used for comparison: '91M61', '91Y70', '91M70' and '91Y90'

Summary: '91Y80' has no anthocyanin colouration of the hypocotyl while '91M61' and '91Y70' has anthocyanin colouration. The flower colour of '91Y80' is white while it is purple in '91M61' and '91Y70'. The plants of '91Y80' are taller than those of '91M61', '91Y70', and '91M70' but shorter than those of '91Y90'. The pod colour of '91Y80' is tan while it is brown in '91Y90'. '91Y80' has a spherical rounded seed shape while it is spherical flattened in '91M61', '91Y70' and '91M70'. The hilum of '91Y80' is black while it is dark brown in '91M70' and '91Y90'. '91Y80' matures later than '91M61', '91Y70', and '91M70'.


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

FLOWER: white

POD: tan
SEED: spherical rounded, medium size, dull to shiny coat lustre, yellow ground colour of testa, black hilum, medium to large size hilum, normal abscission layer of hilum

AGRONOMY: 1.8 group maturity, 2975 heat unit rating, insensitive photoperiod, good resistance to lodging

DISEASE REACTION: resistant to Phytophthora rot (Phytophthora megasperma F. sp. glycinea) and resistant to soybean cyst nematode (Heterodera glycines)
QUALITY: 39.4% protein, 20.4% oil, high seed coat peroxidase acitvity

Origin & Breeding History: '91Y80' (experimental designations 'PH08104' and 'XB18E08') was derived from the cross 91B42/L04549 made in 2001 in Illinois, USA. '91Y80' is an F4 reselection from an F2 derived line. The F4:F5 progeny row was grown in a plant row yield trial in Illinois in the summer of 2003. Subsequently, it has undergone 5 years of extensive testing and purification. A commercial number has been assigned based on yield, soybean cyst nematode resistance (race 3), multi-gene Phytophthora resistance, brown stem rot field tolerance, iron deficiency chlorosis tolerance, and resistance to Roundup branded herbicides. In 2006, the purification block was grown in Illinois and 63 sub-lines were harvested. In 2006/2007, 0.5 acre increase was grown in Chile. In the summer of 2006, 20 acres of parent seed stock were grown. In the summer of 2008, 400 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 200900141, purchased from the Plant Variety Protection Office in the USA.

Comparison tables for '91Y80' with reference varieties '91M61', '91Y70', '91M70' and '91Y90'

Maturity date

  '91Y80' '91M61' '91Y70' '91M70' '91Y90'
days 114 111 112 112 115

Plant height (cm)

  '91Y80' '91M61' '91Y70' '91M70' '91Y90'
mean 63 56 60 60 64
standard deviation 2.05 1.22 0.98 2.18 1.39

Click on image for larger view
Soybean: '91Y80' (bottom centre) with reference varieties '91M61' (bottom left), '91M70' (bottom right), '91Y90' (top left), and '91Y70' (top right)

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