fruit and seed dispersal pdf
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courtesy of sir ross vasquezTRANSCRIPT
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Seeds are mature or ripened ovules. It has seed coat (testa and tegmen), reserved food, and the embryo.
Palay grains – monocot seed
Two types according to reserved nutrients
Endospermic – with reserved endosperm also called albuminous.
Non- endospermic(Exalbuminous)
food reserved in cotyledon
Seed types according to the number of cotyledons
Monocot seed –with one cotyledon called “scutellum”– an absorptive cotyledon.
Dicot seed –
with two cotyledons
FRUIT AND SEED DISPERSAL
Transfer of fruits and seeds from one place to another by themselves or by external agencies.
Two types of dispersal mechanisms
by itself - Autochory External – through several
agents like water, wind, animals.
External Agencies Water – hydrochory Animal – zoochory
attached to animal –epizoochory
eaten by animals –endozoochory
birds- ornithochory mammals –
mammaliochory bats – chiropterochory ants – myrmechory
Wind – anemochory
Blowing In The Wind
Seeds & Fruits Dispersed
By Wind
Squirrel-Tail Grass. The long awns function like the
parachute bristles (pappus) of composites.
Fuzzy brown cattail spikes (Typha latifolia)
contain dense masses of tiny seeds.
The remarkable winged seed of the tropical
Asian climbing gourd Alsomitra macrocarpa..
Seeds of kalachuchi, malunggay,
Dandelion (Taraxacum officinale).
The slightest gust of wind catches the elaborate
crown of plumose hairs, raising and propelling
each seed-bearing achene into the air like a
parachute.
Calyx modified into plumes
dandelions
Wings on pericarp
Thumble weeds
The quipo tree (Cavanillesia platanifolia),
a remarkable rain forest tree in the bombax
family (Bombacaceae) with huge winged
fruits.
Parachute seeds (plumose seeds) escaping
from the follicle of Nerium oleander. The crown
of silky hairs arises directly from the top of the
seed (not on an umbrella-like stalk.
An interesting one-seeded winged fruit that
spins as it falls through the air. It is called
"whirling nut“.
Gyrocarpus in the gyrocarpus family
(Gyrocarpaceae).
Helicopters
(Whirlybirds)
Spinning fruits from Thailand. The
species ID of these fruits would be
greatly appreciated.
Sailing in the water
Fruit and Seeds dispersed by Water
Lotus fruit – spongy receptacle
Coconut fruit – impervious and buoyant pericarp
Traveling with animals
Fruit and seeds dispersed by animals
Devil’s claw fruit catches on the legs of animals
epizoochory
Seeds that produce elaiosomes, oil bodies that attract ants, which disperse the seeds
while eating the elaiosomes as food.
(myremechory)
Thowhorn fruit – spiny fruits
Fruit with barbs, awns and spikes that get
entangled in fur of animals
Barbs or hooks that stick to the fur of animals
Cocklebur fruits are well known to hikers.
Endozoochory – seeds pass through animal’s digestive system, aids in
germination
Raspberries fruits
Edible but indigestible seeds– tomato, water melon, aratiles, santol
Unedible seeds –ampalaya, papaya, bell pepper, squash,
Thank you and good day
Ross D. Vasquez