MassFlowDyn I:: A carbon transport and partitioning model for root system architecture

被引:61
作者
Bidel, LPR
Pagès, L
Rivière, LM
Pelloux, G
Lorendeau, JY
机构
[1] INRA, F-49071 Beaucouze, France
[2] INRA, Lab Automat & Microinformat Avignon, Domaine St Paul, Site Agroparc, F-84914 Avignon 9, France
[3] INRA, Unite Ecophysiol & Hort, Domaine St Paul, Site Agroparc, F-84914 Avignon 9, France
关键词
Munch theory; phloem transport model; photoassimilate-partitioning; root growth; root system architecture; translocation;
D O I
10.1006/anbo.2000.1149
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Carbon partitioning is important for understanding root development but little is known about its regulation. Existing models suggest that partitioning is controlled by the potential sink strength. They cannot, however, simulate hierarchical uptake other than by using absolute priorities. Moreover, they cannot explain that the changes in photoassimilate partitioning result from changes in photosynthesis. In this paper we present a model of phloem sieve circulation, based on the model of Minchin ct al. (Journal of Experimental Botany 44: 947-955, 1993). The root system was represented by a network of segments to which meristems were connected. The properties of the segments were determined by the differentiation stage. Photoassimilate import from each organ was assumed to be limited by a metabolic process and driven by Michaelis-Menten kinetics. The axial growth was proportional to meristem respiration which drives the flux of new cells required for root elongation. We used the model to look at trophic apical dominance, determinate and indeterminate root growth, the effect of the activity of a root on competition with its neighbours, and the effect of photoassimilate availability on changes in partitioning. The simulated phloem mass flow yielded results of the same order of magnitude as those generally reported in the literature. For the main well vascularized axis, the model predicted that one single apical meristem larger than its neighbouring laterals, was enough to generate a taprooted system. Conversely, when the meristem of laterals close to the collar had a volume similar to that of the taproot. the predicted network became fibrous. The model predicted a hierarchical priority for organ photoassimilate uptake, similar to that described in the literature, during the decline in photosynthetic activity. Our model suggests that determinate growth of the first laterals resulted from a local shortage of photoassimilate at their meristem, as a result of the limited transport properties of the developed roots. (C) 2000 Annals of Botany Company.
引用
收藏
页码:869 / 886
页数:18
相关论文
共 78 条
[1]   ROOT ELONGATION RATE IS ACCOUNTED FOR BY INTERCEPTED PPFD AND SOURCE-SINK RELATIONS IN-FIELD AND LABORATORY-GROWN SUNFLOWER [J].
AGUIRREZABAL, LAN ;
DELEENS, E ;
TARDIEU, F .
PLANT CELL AND ENVIRONMENT, 1994, 17 (04) :443-450
[2]   CARBON NUTRITION, ROOT BRANCHING AND ELONGATION - CAN THE PRESENT STATE OF KNOWLEDGE ALLOW A PREDICTIVE APPROACH AT A WHOLE-PLANT LEVEL [J].
AGUIRREZABAL, LAN ;
PELLERIN, S ;
TARDIEU, F .
ENVIRONMENTAL AND EXPERIMENTAL BOTANY, 1993, 33 (01) :121-130
[3]  
[Anonymous], 1965, NONEQUILIBRIUM THERM
[4]  
[Anonymous], TRANSPORT PHOTOASSIM
[5]  
[Anonymous], RESP PATTERNS ROOTS
[6]  
[Anonymous], NEW ROOT FORMATION P
[7]   LATERAL ROOT-FORMATION IN PINE-SEEDLINGS .2. THE ROLE OF ASSIMILATES [J].
ATZMON, N ;
REUVENI, O ;
RIOV, J .
TREES-STRUCTURE AND FUNCTION, 1994, 8 (06) :273-277
[8]  
BIDEL LPR, 1999, THESIS U ANGERS FRAN
[9]  
BIDEL LPR, 2000, IN PRESS J EXPT BOT
[10]   Site, scale and time-course for adjustments in lateral root initiation in wheat following changes in C and N supply [J].
Bingham, IJ ;
Blackwood, JM ;
Stevenson, EA .
ANNALS OF BOTANY, 1997, 80 (01) :97-106