Flashcards on Plant Development and Hormonal Regulation
Plant Development and Hormonal Regulation: A Student Guide
Tap to flip · Swipe to navigate
Floral development, organ identity & genetics
23 cards
Card 1
Question: What role does high FLC concentration in the vegetative shoot apical meristem (SAM) play regarding flowering competence?
Answer: High FLC concentration acts as a flowering repressor; a decrease in FLC triggers meristem competence to respond to floral induction signals.
Card 2
Question: What signals can induce floral induction after meristem competence is achieved?
Answer: Gibberellins, light, low temperatures (vernalization), and autonomous signals.
Card 3
Question: Which gene class increases expression after floral induction to commit meristem cells to form flowers?
Answer: Reproductive meristem identity genes, for example SOC1, increase and lead to determination (commitment) to form flowers.
Card 4
Question: What is the sequence of gene expression events that leads from vegetative SAM to flower development?
Answer: Decrease in FLC → meristem competence → floral induction signals → increased reproductive meristem identity genes (determination) → activation of flor
Card 5
Question: Name the four types of floral organs and the order of their whorls from outermost to innermost.
Answer: 1) Sepals (1st/outermost), 2) Petals (2nd), 3) Stamens (3rd, male), 4) Carpel (4th/innermost, female).
Card 6
Question: According to the ABC model, what organ identity is specified by Class A activity alone?
Answer: Sepals.
Card 7
Question: According to the ABC model, what organ identity is specified by Class A + B activities?
Answer: Petals.
Card 8
Question: According to the ABC model, what organ identity is specified by Class B + C activities?
Answer: Stamens.
Card 9
Question: According to the ABC model, what organ identity is specified by Class C activity alone?
Answer: Carpels.
Card 10
Question: What are the genetic encodings for Class A, B, and C activities mentioned in the content?
Answer: Class A: AP genes; Class B: PI genes; Class C: AG genes.