Age- and size-related trends in woody plant shoot development: regulatory pathways and evidence for genetic control |
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| Authors: | Day M E Greenwood M S Diaz-Sala C |
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| Institution: | Department of Forest Ecosystem Science, University of Maine, Orono, Maine 04469-5755, USA. |
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| Abstract: | Woody plants exhibit significant and predictable patterns of change in morphology and physiology as they become older and larger. Four models of potential pathways controlling these changes are presented: a stimulus-response model in which fully developed organs respond to changes in environment (defined here as everything external to the organ); an extrinsic model in which the attributes of developing organs are determined by environmental factors; an intrinsic model in which changes are a result of programmed changes in gene expression; and an extrinsic-intrinsic model in which changes in gene expression are induced by environmental factors. We review evidence that a genetic component is involved in controlling age- and size-related changes in foliar morphology and physiology and discuss the possibility of complex interactions among model pathways. |
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