Vegetative to Floral Transition Flashcards
why is flowering time important
want to do it at a time where you have enough resources, when the conditions are appropriate for that specific plant etc
transitions in arabadopsis lifecycle
juvenile to adult, vegetative to floral
diff meristems
vegetative meristem- leaves
reproductive meristem- flowers
thing which initiates flowering
florigen- been trying to figure out what it is- systemic signal produced in leaves which initiates flowering
florigen gene
FT in ara.- and orthologs (identified as moving into the shoot apex)
anti-florigen example
TFL- maintains meristem identity
what is FD
a transcription factor- FT and TFL bind to it
> w/ FD to form the florigen activation complex (FAC)
what does FAC do
triggers transcriptional reprogramming at the shoot apex - floral induction, floral evocation, floral morphogenesis
genetic pathways which feed into the florigen switch- dont remember em all lol
-giberellins pathway
-age pathway
-photoperiod pathway
-ambient temp pathway
-vernalisation pathway
example of a protein which fluctuates in the photoperiod pathway
CO- peaks at dusk in LD plants
FT works downstream
FLC
another regulator of flowering time- blocks floral pathway under certain circumstances
epigenetic modifications and flowering time
components of the vernalisation and autonomous pathways mediate deposition of histone marks, which can regulate FLC
rice- long or short day
rice is short day, long day delays flowering
wheat short or long day
long
why is all of this important agriculturally
can alter flowering and floral regulators when cultivating cereal plants - later flowering could have improved seed production
