Fxp

Pig. 2.4.22. A Schematic presentation of the partitioning of carbon in a plant for particular functions: growth, defence, formation and accumulation of reserves. Only part of this C can be reallocated and is thus a "store". B Flux of carbon assimilates from C02 assimilation to growth and the reutilisation of C with death of plant parts (e.g. leaf fall). Accumulation occurs when C production (assimilation plus reallocation) exceeds immediate requirements. Formation of reserves occurs when the conditions for formation of storage products (e.g. starch) competes with growth processes. Short-term assimilate pools, which act as physiological control, are shown as a "well". (Chapin et al. 1990)

Sink leaf

Respired CO

Sink leaf

Respired CO

Root

Respired C02 Respired C02

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