Floral Transition
The transition from the vegetative phase to a reproductive phase involves a dramatic change in the plant’s vital cycle, perhaps the most important one, as the process must be carried out correctly in order to guarantee that the plant produces descendents. This transition is characterised by the induction and development of the meristem of the inflorescence, which will produce a collection of flowers or one flower, where only one is produced. This morphogenetic change contains both endogenous and exogenous elements: For example, in order for the change to be initiated the plant must have a certain number of leaves and contain a certain level of total biomass. Certain environmental conditions are also required such as a characteristic photoperiod. Plant hormones play an important part in the process, with the gibberellins having a particularly important role.
There are many signals that regulate the molecular biology of the process. However, it is worth noting the role of the following three genes in Arabidopsis thaliana: FLOWERING LOCUS T (FT), LEAFY (LFY), SUPPRESOR OF OVEREXPRESSION OF CONSTANS1 (SOC1, also called AGAMOUS-LIKE20). These genes possess both common and independent functions in floral transition. SOC1 is a MADS-box-type gene, which integrates responses to photoperiod, vernalization and gibberellins.
Read more about this topic: ABC Model Of Flower Development
Famous quotes containing the word transition:
“There is not any present moment that is unconnected with some future one. The life of every man is a continued chain of incidents, each link of which hangs upon the former. The transition from cause to effect, from event to event, is often carried on by secret steps, which our foresight cannot divine, and our sagacity is unable to trace. Evil may at some future period bring forth good; and good may bring forth evil, both equally unexpected.”
—Joseph Addison (1672–1719)