Plant Development 4 Flashcards
Advantages of angiosperms (2)
- means of pollinator attraction (increases chances of fertilisation)
- development of fruit (improved seed dispersal)
What are stimulators that cause the shoot apical meristem to become a flowering meristem?
Hormonal signalling
Light quality (photoperiod)
Warm temperature
X
SPL TFs are controlled by miRNAs (156). These are strongly expressed in juvenile phases of plant life. As sugar increases in plant it’s expression is repressed. So an increase in more leaves which can make more sugar signals to inhibit TFs
X
X
X
Short Day plant
Long day plant
Day neutral plant
Plant is measuring the duration of the night not the day
What types of light promote flower transitions?
Red light sensed by phytochromes
blue light sensed by LOV-domain containing photoreceptors (FKF1)
How is the photoperiod received?
Photoreceptors possess a prosthetic group that changes redox state when exposed to specific wavelengths, causing it to become active
Define photoperiod
X
Photo inactivation
Active prosthetic group can be spontaneously deactivated by phot inactivation (light)
X
X
Which types of plants x
Plants that live at the equator and there is a smaller difference with data d might duration throughout the year
Plant species in the desert that need to immediately flower for example straight after rainfall
X
Gibberellin degrades a repressor that
X
Decrease gibberelin levels through expression of gibberelin oxidase.
X
Gibberelin a are not the key inducer of the flowering process
X
X
