Gibberellins Flashcards
gibberellins are best knowns as regulators of stem height growth and –
seed germination
principal and most bioactive component of giberellic acid
GA3
GA cause plant elongation responses especially in dwarf varieties and in rosette plants
bolting
higher concentrations found in – than vegetative seeds
immature seeds
GAs possess a tetracyclic skeleton with – atoms
19-20
T/F: GAs are synthesized throughout the life cycle
true
GA is independent of the auxin effect and has a – lag period
longer
GA increase wall extensibility and also – yield threshold
reduces
GA biosynthesis inhibitors are used to reduce height in crops –> reduce collapse of tall grasses and reduce – and the etiolation response
self-shading
GA mutants have – roots
shorter
photoperiodic flower induction is mediated by GA in some species, GA can substitute for – requirement for flowering in many plants such as rosette species
long-day
in maize, GA suppress – dev
stamen
cucumber, hemp, and spinach GA promote – dev
male
GA required for dev of pollen grain and formation of –
pollen tube
fruit growth following pollination
fruit set
