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Irene McKechnie and Risa Sargent University of Ottawa
Peterson et. al 2006
• External and/or internal structures
• > 80% of all plant species
Polle
n g
rain
s / f
low
er
Flo
wer
num
ber
mycorrhizal
non-mycorrhizal
Philip et al. 2001
Seed s
et
Wolfe et al. 2005
mycorrhizal
non-mycorrhizal
Inflore
scence n
um
ber
Gange and Smith 2005
Vis
its p
er
flow
er
/ m
inute
Gange and Smith 2005
mycorrhizal
non-mycorrhizal
Arr
ivals
/ h
our
Wolfe et al. 2005
Peterson et al. 2006
mycorrhizal colonization
pollen nectar flower number
pollen limitation fruit set fruit weight seed set
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Paired stems
• Flower number • Pollen limitation • Fruit set • Fresh berry
weight • Dry berry
weight • Seed numbers
Bagged stem • Nectar volume • Pollen counts • Root samples
Peterson et al. 2006 Present study
Species System Mean colonization (%)
Study
V. angustifolium commercial 9.6 present
V. angustifolium lowbush blueberry
commercial 3.6-25.9 Jeliazkova and Percival 2003
native 25.4 Stevens et al. 1996
V. corymbosum highbush blueberry
commercial 6.6-7.7 Goulart et al. 1995
commercial 10.6 Yang et al. 1998
commercial 4.5-6.1 Stevens et al. 1996
native 15.4 Stevens et al. 1996
flow
er
num
ber
mycorrhizal colonization (%)
polle
n g
rain
s / f
low
er
mycorrhizal colonization (%)
fruit s
et (#
fru
it / #
flo
wers
)
mycorrhizal colonization (%) seeds / b
err
y
mycorrhizal colonization (%)
pollen count nectar
volume
mycorrhizal colonization
reproductive measures
flower number
• Structural equation modelling & other analyses
• Impacts of foliar fungicides on mycorrhizal colonization
• Impacts of fertilizers on mycorrhizal colonization
• Species identification of fungal partners
Field/Lab helpers: • Sarah Hirschfeld • Kayley Fowler • Sylvia Wilson • Braydon Hall • Nicole Darling • Rebecca Rabinovich • Jake Russell-Mercier
Field owners: • Bernard Savoie • Benoit Savoie • Calixte Comeau • Patrice Doucet • Olivier Breau • Wanitta St-Coeur • Denis St-Coeur
Collaborators: • Melissa Fulton • Linley Jesson • Kyle Bobiwash • Daniel Schoen
Thesis committee: • Jeremy Kerr • Lenore Fahrig
Helpful feedback: • Sargent Lab • Rundle Lab • Kassen Lab • Forrest Lab
mycorrhizal colonization
pollen nectar flower number
pollen limitation fruit set fruit weight seed set
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