MassFlowDyn I: A Carbon Transport and Partitioning Model for Root System Architecture

• DOI: 10.1006/anbo.2000.1149
• Publication Date: 2002-09-16T09:49:23Z
• Authors: L Bidel
• Keywords: Indeterminate growth; Root system; Pericycle

Carbon partitioning is important for understanding root development but little known about its regulation. Existing models suggest that controlled by the potential sink strength. They cannot, however, simulate hierarchical uptake other than using absolute priorities. Moreover, they cannot explain changes in photoassimilate result from photosynthesis. In this paper we present a model of phloem sieve circulation, based on Minchin et al . ( Journal Experimental Botany44 : 947–955, 1993). The system was represented network segments to which meristems were connected. properties determined differentiation stage. Photoassimilate import each organ assumed be limited metabolic process and driven Michaelis–Menten kinetics. axial growth proportional meristem respiration, drives flux new cells required elongation. We used look at trophic apical dominance, determinate indeterminate growth, effect activity competition with neighbours, availability partitioning. simulated mass flow yielded results same order magnitude as those generally reported literature. For main well vascularized axis, predicted one single larger neighbouring laterals, enough generate taprooted system. Conversely, when laterals close collar had volume similar taproot, became fibrous. priority uptake, described literature, during decline photosynthetic activity. Our suggests first resulted local shortage their meristem, transport developed roots. Copyright 2000 Annals Botany Company