Guelph Evolution

Asparagus

Denomination: 'Guelph Evolution'
Previously Proposed Denomination: 'UG001'
Botanical Name: Asparagus officinalis
Applicant/Holder: University of Guelph
Catalyst Centre
50 Stone Rd E, Ichthyology Building #92
Guelph, Ontario
N1G 2W1
Canada
Breeder: David Wolyn, University of Guelph, Guelph, Ontario
Application Date: 2014-02-03
Application Number: 14-8189

Variety Description

Varieties used for comparison: 'Guelph Millennium' and 'Gijnlim'

Summary: 'Guelph Evolution' has a low to medium frequency of plants with one or more androhermaphrodite flowers whereas 'Guelph Millennium' and 'Gijnlim' have a high to very high frequency of plants with one or more androhermaphrodite flowers. The first bracts at the base of the apex of the spear of 'Guelph Evolution' are larger than the first bracts at the base of the apex of the spear of 'Guelph Millennium'. 'Guelph Evolution' has medium dense phylloclades whereas 'Gijnlim' has dense phylloclades. When fully extended, the length of the stem of 'Guelph Evolution' is shorter than the stem of 'Guelph Millennium'.

Description:

PLANT: medium density of phylloclades, medium intensity of green foliage, many stems, androhermaphrodite flowers and/or male flowers with style rudiments are present, plants with androhermaphrodite flowers occur at a low to medium frequency

SPEAR: early emergence
SPEAR APEX: medium triangular shape, anthocyanin colouration present, equal in diameter compared to middle of stem
BRACTS: adpressed, closed to weakly open

FLOWERING: begins early in the season

Origin & Breeding History: The male asparagus hybrid 'Guelph Evolution' (experimental number UG001) is produced by crossing a female clone and a supermale clone. The initial cross was made at the University of Guelph, Guelph, Ontario in 1995. The female parent was a plant selected from an open-pollinated asparagus variety. The supermale parent was a plant grown from seed extracted in 1994 from andromonoecious berries found on a male asparagus hybrid. Selection criteria for 'Guelph Evolution' included high marketable yield, resistance to foliar diseases and longevity of years of harvest. The hybrid was also selected for long, smooth spears with tight tips and uniform spear diameter.

Tests & Trials: The comparative trials for 'Guelph Evolution' were conducted at the Simcoe Research Station, Simcoe, Ontario in 2015 and 2016. There were two replicated plots for each of 'Guelph Evolution', 'Guelph Millennium', and 'Gijnlim'. Each plot contained twenty crowns spaced 30 cm apart with a distance between rows of 1.25 metres. Mean differences are significant at the 5% probability level based on a paired Student's t-test.


Comparison tables for 'Guelph Evolution' with reference varieties 'Guelph Millennium' and 'Gijnlim'

Length of first bracts at base of apex of spear (cm)

  'Guelph Evolution' 'Guelph Millennium' 'Gijnlim'
mean 2015 0.9 0.8 0.9
std. deviation 0.19 0.19 0.18
number measured 38 39 37
mean 2016 1.2 1.1 1.3
std. deviation 0.20 0.13 0.18
number measured 38 40 38

Width of first bracts at base of apex of spear (cm)

  'Guelph Evolution' 'Guelph Millennium' 'Gijnlim'
mean 2015 0.6 0.5 0.5
std. deviation 0.16 0.15 0.14
number measured 38 39 37
mean 2016 1.1 1.0 1.2
std. deviation 0.19 0.19 0.36
number measured 38 40 38

Maximum length of fully extended stem (cm)

  'Guelph Evolution' 'Guelph Millennium' 'Gijnlim'
mean 2015 140.5 146.9 141.8
std. deviation 16.01 19.51 24.42
number measured 38 40 38
mean 2016 182.2 195.5 190.9
std. deviation 15.07 17.60 28.00
number measured 38 40 38

Click on image for larger view
Guelph Evolution
Asparagus: 'Guelph Evolution' (centre bottom) with reference varieties 'Guelph Millennium' (bottom left) and 'Gijnlim' (top left)

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