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Annals of Botany 87: 655-659, 2001
© 2001 Annals of Botany Company

Partitioning of Stored Resources Between Shoots in a Clone, and its Effects on Shoot Size Hierarchy

Jun-ichirou Suzuki+ and Toshihiko Hara

Department of Biology, Tokyo Metropolitan University, Tokyo, 192-0397, Japan The Institute of Low Temperature Science, Hokkaido University, Sapporo, 060-0819, Japan

Received: 4 October 2000 ; Returned for revision: 20 November 2000 . Accepted: 29 January 2001

A theoretical study is described of the effects of the pattern of partitioning of stored resources between the shoots of a clone on the development of shoot size hierarchy. When there is an increasing convex relationship between the amount of resources available to a shoot at the start of growth and its biomass at maturity, the mode of competition between the shoots is asymmetric and the sharing of stored resources between shoots will not maximize above-ground biomass of the clone at maturity. Under this condition, the plant is predicted to allocate a smaller amount of its resources to storage, producing a lower below/above-ground biomass ratio. Clonal species in which shoots compete asymmetrically are known to have smaller below/above-ground biomass ratios. When there is an increasing concave relationship between the amount of resources available to a shoot at the start of growth and shoot biomass at maturity, the mode of competition will be symmetric, and equal sharing of stored resources between all shoots at the start of growth will maximize the above-ground biomass of the clone at maturity. If sharing of resources is the optimal pattern of partitioning, all shoots of the clone are predicted to be equal in size at maturity and, therefore, a size hierarchy will not develop within a clone. Copyright 2001 Annals of Botany Company

Clonal plants, pattern of partitioning, stored resources, shoot competition, size hierarchy, sharing of resources, symmetric competition


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