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Changes in photosynthesis, xanthophyll cycle, and sugar accumulation in two North Australia tropical species differing in leaf angles

Xu, S. M., Liu, L. X., Woo, K. C. and Wang, D. L. (2007). Changes in photosynthesis, xanthophyll cycle, and sugar accumulation in two North Australia tropical species differing in leaf angles. Photosynthetica,45(3):348-354.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 2 times in Scopus Article | Citations

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Title Changes in photosynthesis, xanthophyll cycle, and sugar accumulation in two North Australia tropical species differing in leaf angles
Author Xu, S. M.
Liu, L. X.
Woo, K. C.
Wang, D. L.
Journal Name Photosynthetica
Publication Date 2007
Volume Number 45
Issue Number 3
ISSN 0300-3604   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-34547768340
Start Page 348
End Page 354
Total Pages 7
Place of Publication Netherlands
Publisher Springer
HERDC Category C1 - Journal Article (DEST)
Abstract Two tropical species of North Australia, Acacia crassicarpa and Eucalyptus pellita, have similar leaf size and leaf structure but different leaf angles. A. crassicarpa with near vertical leaf angle directly reduced photon absorption and leaf temperature (T-1) and had relatively high photosynthetic activity (P-max) and low xanthophyll cycle activity. In contrast, E. pellita with a small leaf angle exhibited high T-1, low P-max, and high activity of xanthophyll cycle which was useful for the dissipation of excessive energy and reduction of photoinhibition. In the dry season, contents of soluble sugars including pinitol, sucrose, fructose, and glucose in A. crassicarpa increased whereas larger amounts of only fructose and glucose were accumulated in E. pellita. Different sugar accumulation may be involved in osmotic adjustment of leaves during water stress that makes photosynthesis more efficient. The leaf angle may be critical for developing different protective mechanisms in these two tropical tree species that ensure optimal growth in the high irradiance and drought stress environment in North Australia.
Keywords Acacia
diurnal changes
Eucalyptus
leaf angle
leaf morphology
osmoregulation
photoprotection.
PINITOL ACCUMULATION
WATER RELATIONS
DROUGHT STRESS
HIGH-LIGHT
PLANTS
LEAVES
PHOTOINHIBITION
TEMPERATURE
TOLERANCE
RADIATION
DOI http://dx.doi.org/10.1007/s11099-007-0059-4   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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