Part II Overcoming Seed Dormancy Flashcards
What is scarification in seed propagation?
Mechanical or chemical treatment to weaken the seed coat.
Name two methods of scarification.
Abrasion, nicking, chemical treatment.
How does stratification help in seed germination?
Exposing seeds to temperature and moisture changes.
What environmental conditions are simulated in stratification?
Cold, moist conditions.
What is imbibition?
The seed absorbs water and swells.
What happens during imbibition?
Enzymes activate, breaking down food reserves.
What role do enzymes play in seed germination?
They break down stored nutrients into usable forms.
What is the first structure to emerge during germination?
The radicle
What is the purpose of the radicle?
Anchors the plant and absorbs water/nutrients.
What part of the plant emerges after the radicle?
The plumule.
How does the plumule contribute to seedling growth?
Develops into the shoot and leaves for photosynthesis.
Why is water essential for seed germination?
It activates enzymes and biochemical reactions.
How does temperature influence seed germination?
Influences enzyme activity and germination speed.
What is the effect of light on seed germination?
Some seeds need light; others germinate in darkness.
How does oxygen support seed germination?
Supports cellular respiration for embryo growth
What process marks the end of dormancy?
Germination
Why is seedling establishment crucial?
It allows the seedling to establish roots and photosynthesize.
What happens if seeds lack oxygen during germination?
Germination stops due to lack of respiration.
What causes seedling failure during establishment?
Inadequate water, oxygen, or nutrients.
How does soil moisture affect seedling growth?
Insufficient moisture hinders germination.
