Resource Translocation Modelling Highlights Density-Dependence Effects in Fruit Production at Various Levels of Organisation.

ABSTRACT: The size of fruit cells, seeds and fruits depends on their number. Could this density-dependence effect result from sugar resource sharing and, if so, does it involve phloem sugar flow or the intensity of sugar unloading to the sink? A density-dependence model (DDM) describing these processes was designed and parameterised for six species at five levels of organisation: cells and seeds within fruits, fruits within clusters, fruits within plants and plants within plots. Sugar flow was driven by phloem conductance, determined by parameters α, governing the shape of its relationship to population size, and κ, its value for a population size of one. Sugar unloading followed Michaelis-Menten kinetics with parameters V_m (maximal unloading rate) and K_m

SUBMITTER: Genard M 

PROVIDER: S-EPMC9305715 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature