Lecture 31- Plant Hormones Flashcards
are plant hormones in low or high concentrations?
low
where are plant hormones mobile?
throughout the body
what is the process of a hormone binding to a receptor? (3)
reception: hormone binds to a receptor (protein)
transduction: relay proteins and second messengers in the cytoplasm
response: activation within the cytoplasm
what are the 5 major hormones?
auxin
cytokinin
gibberellins
abscisic acid
ethylene
in what plants/ structures is auxin high? (4)
SAM
young leaves
fruit
seeds
what happens when theres disruption in the auxin flow?
triggers the development and activation of axillary buds
auxin promotes vertical growth so what happens when theres reduction in auxin?
growth in lower branches will occur
auxin can be used to propagate plants, what happens when theres too much auxin?
plant will OD and die
what does cytokinin do?
stimulates cell division (cytokinesis)
where is cytokinin produced?
in actively growing tissues (roots, embryo, fruit)
what happens when cytokinin works together with auxin? (2)
control cell division and differentiation
control apical dominance
what is apical dominance?
process of plant growing tall but not out
what happens if the terminal bud is removed?
plants become bushier
what is the function of gibberellins? (3)
promotes rapid and uninhibited growth
involved in cell elongation, flowering and seed germination
cant maintain seed dormancy
why do gibberellin hormones get sprayed on fruits?
to stimulate fruit growth and elongation
makes grapes appear juicier, makes green onions longer
