PLANT RESPONSES TO
THE BIOTIC ENVIRONMENT
Year 13 Biology
Chaparral bush allelopathy
Chaparral bush allelopathy
• Allelopathy – a form of antibiosis in which
one plant secretes toxins into the
surrounding soil that stops others growing.
Allelopathetic! –
Walnut secretes juglone
Allelopathy again - Casurina
Stratification
• Large trees
change
conditions
beneath them
creating microclimates
resulting in
vertical layering
Epiphytes - Perching Lilies and
staghorn fern
Lianas –climbing vines
• Supplejack
Bush lawyer
Climbing Rata
PLANT PARASITES “Broom rape”
Mistletoe Loranthus
PLANT PARASITES Dactylanthus
PLANT PARASITES Dactylanthus
Dactylanthus Wood rose
Seedling of Dactylanthus
Root parasite Exocarpus haustoria
Growing close together for mutual
support
Are you
ok Jude
Why yes,
Thanks for
your
support Bev
Legume root nodules
Mycorrhizal fungi extend roots’ ability to
absorb water and nutrients
Lichen
Microscope cross section
Lichen again