EUIUI angiosprm seed structure Flashcards
Dicot seed Consists of
- Hilum - small white scar
- Micropyle
- Hypocotyl AKA radicle
- Seed coat
- Embryo
Cotyledon
The embryo comprises of dico
- Cotyledon
- Epicotyl
- Hypocotyl
- Radicle
- Plumule
in monocot seed, food stored in
what is it filled with
endosperm
endosperm filled with starch
What absorbs food from endosperm
monocot
cotyledon
what protects the what
monocot
Coleoptile encloses and protects plumule
- Coleorhiza encloses and protects radicle
fuck you
what is the seed coat in monocot
Pericarp
Groups with important seeds:
cereals (Poaceae); >50% of world daily calorie intake
* legumes (Fabaceae)
* mustard family (Brassicaceae)
prolly have to know familiy cuz this guys a cuck
Canada is among the top
waaaaaaat
rapeseed (incl. canola) and wheat producers in
the wor
the big 3
rice
wheat
corn
in dicot, what does each thing turn into
radicle- roots
epicotyle- stem above cotyledons
cotyledons- shit like weird shut
hypocotyle- below cotyledon is stem
plumule- first leaves
Aleurone layer
in monocot, borderes endosperm shit
Cotyledon another word
(scutellum)
Epigeal germination and the steps
- Cotyledons emerge from soil
1) Root emerges
2) Hypocotyl elongates and forms a hook
3) Hook straightens and pulls cotyledons and first leaves above ground
4) Epigeous germination
Hypogeal germination
1) Hypogeal germination
- Cotyledons remain in soil
Steps
1) Radicle emerges from coleorhiza
2) Coleoptile pushed up and plumule emerges
Orthodox seeds
Survive drying and freezing
Can be stored for prolonged periods
orthodox seeds
Unorthodox seeds
Seeds that are not able to tolerate low temperature and moisture
Germination
Beginning or resumption of growth of a seed
what state do most seeds go through? what type of seed does not survive this shit
desiccated state, unorthodox seesd
what type of respoiration is oxygen present
what type of soil is oxygen present in?
aerobic respiration
Well aerated soil PORE SPACES
minimum temperature
ideal temp
max temp
- Minimum 0-5 C
- Maximum 45 C
- Optimum 20-30 C
Most plants do not require what to germinate
light
Dormancy and function
- Period of growth inactivity in seeds or buds
- Happens even when environmental requirements for germination
Function
Delaying mechanism that assures that seeds will germinate at proper time
Breaking of dormancy
- Stratification
- Scarification
- Scarification
- Breaking of seed coat by mechanical action
Stratification
Seed needs to be chilled and kept moist
Phases of germination
Phase 1) Imbibition
- Weight increases exponentially
Phase 2) Lag Phase
- Weight is constant, steady
Phase 3) Radicle emergence
Weight increases again
