  GreenLab Model is a functional-structural plant growth model that combines
both organogenesis (at each cycle, new organs are created with respect to
genetic rules) and photosynthesis (organs are filled with the biomass produced
by the leaves photosynthesis). Our new developments of the model concern the
retroaction of photosynthesis on organogenesis. We present here the first step
towards the total representation of this retroaction, where the influence of
available biomass on the number of metamers in new growth units us modelled.
The theory is introduced and applied to a Corner model tree. Different
interesting behaviours are pointed out.
