New Zealand Journal of Botany abstracts
Photosynthesis and stomatal conductance of the New Zealand tree, Meryta
sinclairii, grown under two watering regimes
F. M. KELLIHER
Landcare Research
P.O. Box 69
Lincoln, New Zealand
M. B. KIRKHAM*
Department of Agronomy
2004 Throckmorton Hall
Kansas State University
Manhattan
Kansas 66506-5501, USA
email: mbk@ksu.edu
J. E. HUNT
Landcare Research
P.O. Box 69
Lincoln, New Zealand
Abstract We measured leaf gas exchange (photosynthesis,
A, and stomatal conductance,
gs) at different levels of quantum
irradiance (
Q) in the warm-temperate, New Zealand tree
Meryta
sinclairii, because it has the largest simple leaves of the New Zealand
flora. Five-year-old, potted seedlings were watered or not watered in a
rain-exclusion screenhouse for three weeks during summer (6-27 March 1998).
Maximum photosynthetic rate (
Amax) was 7.6 umol m
-2
s
-1. Data for 18 March are presented, which show that photosynthesis
saturated at a low level of irradiance. When photosynthesis was 50% of
Amax, the quantum irradiance
Q = 60 umol m
-2
s
-1. A linear relation between photosynthesis and stomatal
conductance explained 85% of the variation. Water limitation reduced leaf area
growth by a factor of 3.
Keywords puka; Meryta sinclairii; Araliaceae;
photosynthesis; stomatal conductance; New Zealand
* Author for correspondence.
B00001
Received 5
January 2000; accepted 21 March 2000
PDF file of entire paper: medium quality (431K); (scanned from paper original: notes about this process)
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