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Trends Plant Sci. 2000 Aug;5(8):349-53.

Age-related changes in photosynthesis of woody plants.

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Dept of Forest Science, Oregon State University, Corvallis, OR 97330, USA.


Woody peoffnials do not appear to go through a defined senescence phase but do have predictable developmental stages. Reduced photosynthesis and stomatal conductance have been reported at all developmental transitions, although some studies have shown the opposite. What causes these changes and why do results differ among studies? Do these changes result from or cause changes in growth? What are the roles of genetics, size, changing conditions and cumulative environmental stress in aging trees? Definitive answers remain elusive but recent research is helping to clarify some of the processes associated with aging and to point the way for further study.

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