flower development - lecture 7 Flashcards
What is the flowering pattern in wild type plants?
Sepal , petal , stamen , carpel
What is a homeotic mutant?
A mutation which results in a functional organ in the wrong area
How do mutations affect the plant?
mutations affect pairs of overlapping whorls
What is a core feature of the ABC model?
overlapping to produce whorls.
What part of the ABC model produces sepal?
A
What part of the ABC model produces petals
A and B
What part of the ABC model produces stamens
B and C
What part of the ABC model produces the carpels?
C
What is the second core feature of the ABC model?
A and C are mutually antagonistic . Therefore if you reduce A or C , it takes over the bottom row
What was the first homeotic gene found?
Agamous
What is a homeotic gene?
genes which regulate the development of anatomical structures in various organisms
What does Agamous code for
Transcription factors in AG plant , DEFA plant, SRF mammal and MCM1 yeast
What is Gibberellin?
plant growth regulator
what does Gibberellin do?
controls stem elongation
How do you create dwarf genes in Arabidopsis thaliana?
Create a mutant gibberellin acid insensitive gene, which produces a non - functional protein . This represses the action of the Gibberellin .
What are the names of the 2 reduced height genes in GR wheat?
rRht-B and Rht-D
What do Rht - B and Rht- D do?
single nucleotide change , creating a stop codon. This leads to the synthesis of short proteins that cannot bind to Gibberellin acid
What happens to a wild type plant without Gibberellin
repressed growth
What are the A homeotic genes
Apetala 2
What are the B homeotic genes?
Apetala 3 and pistillata
What are the C homeotic genes?
Agamous
What does Gai stand for and what does it mean?
Gibberellic acid insensitive These mutants are dwarf
