Spore Germination

Question 1

Spore Germination

Answer 1

Dormant spore -> Environmental signals -> Metabolic Awakening -> Cell division and Growth(Germination) -> Gametophyte

Question 2

Environmental Signals

Answer 2

1. H2O: Reactivates cell processes
2. Temperature of 25* C
3. O2: Cellular respiration = E for cell processes
4. Red Light

Question 3

Role of Phytochrome in Spore Germination

Answer 3

• Phytochrome absorbs Red light (R): Change in shape of phytochrome
• Cause Ca++ channels in the spore plasma membrane to open: influx of Ca++ into spore, activation of Ca-dependent protein Kinases

Question 4

Protein Kinase

Answer 4

1. Phosphorylation of proteins
2. Change in protein activity
3. Breakdown of storage granules
4. E –> mitosis and cytokinesis
   GERMINATION

Question 5

Events of Spore Germination

Answer 5

1. Nucleus migrates to proximal pole (trilete scar) -> occurs along MTs of cytoskeleton
2. Mitosis & asymmetric cytokinesis
3. Spore coat ruptures along trilete scar