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Title: Changing Photosynthetic Capacity during Leaf Ontogeny in Juvenile and Mature Metrosideros polymorpha Trees 
Author: Gerrish, Grant
Date: 1992-07
Publisher: University of Hawai'i Press
Citation: Gerrish G. 1992. Changing photosynthetic capacity during leaf ontogeny in juvenile and mature Metrosideros polymorpha trees. Pac Sci 46(3): 315-324.
Abstract: Net CO2 uptake at light saturation (Pmax) was measured (both
area and weight basis) for leaves of four categories based on leaf age and branch
position in juvenile and mature trees of Metrosideros polymorpha, a tropical,
dicot evergreen species. Conductance, weight /area, and Nand P concentrations
were also measured. In both juvenile and mature trees, Pmax was higher in
terminal leaves 6-14 months old than in younger or older leaves. Low Pmax of
leaves less than 6 months old was related to factors of immaturity, including low
weight /area and low N concentration. Low Pmax of older and subterminal leaves
was correlated with low N concentration related to withdrawal during leaf aging.
This correlation was stronger in mature than in juvenile trees. Pmax was
significantly lower, and nitrogen concentration and specific leaf weight were
higher, in the sample of mature trees than in the juvenile tree sample (Pmax
5.89 and 4.99 molm- 2 S- 1 in juvenile and mature trees, respectively).
ISSN: 0030-8870
URI: http://hdl.handle.net/10125/1411

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