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Lehner, G. ; Delatorre, J.* ; Lütz, C.* ; Cardemil, L.*

Field studies on the photosynthesis of two desert Chilean plants: Prosopis chilensis and Prosopis tamarugo.

J. Photochem. Photobiol. B-Biol. 64, 36-44 (2001)
DOI PMC
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Photosynthetic parameters were investigated in relation to light intensity (PAR and UV-B) in two Chilean Prosopis sp., Prosopis chilensis and Prosopis tamarugo in their natural habitats. The objective of this work was to compare the photosynthetic responses and to determine the degree of adaptation of both species to visible- and UV-radiation stress. One of the study sites was Refresco in the Atacama Desert, where P. tamarugo is an endemic plant and P. chilensis was introduced, and the other was Peldehue in the valley of Central Chile where only P. chilensis is present. Due to latitude, light intensity (UV-B and PAR) is higher in Refresco than in Peldehue. The parameters investigated in both species were photosystem II fluorescence, CO(2) assimilation, stomatal conductance, photosynthetic pigment composition, flavonoid absorption patterns and composition of chlorophyll-protein complexes. Fluorescence studies, CO(2) assimilation and stomatal conductance studies demonstrated that photosynthetic activity is more efficient and stable throughout the day in P. tamarugo than in P. chilensis in Refresco. Chlorophyll-protein complexes also seemed to be more stable in P. tamarugo than in P. chilensis. Photosynthetic pigment analyses indicated possible photodamage in P. chilensis trees in Refresco, but not in Peldehue. Such photodamage was absent in P. tamarugo. There was a considerable change in the flavonoid pattern between noon and afternoon hours in both species at both study sites. The physiological implications of these changes indicate that P. tamarugo is more adapted to high solar radiation than P. chilensis.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Korrespondenzautor
Schlagwörter adaptation; chlorophyll proteins; fluorescence; gas exchange; pigments; UV-B; ULTRAVIOLET-B RADIATION; UV-B; XANTHOPHYLL CYCLE; TISSUE LOCALIZATION; STRATOSPHERIC OZONE; SOLAR-RADIATION; CHLOROPHYLL-A; PISUM-SATIVUM; SEEDLINGS; ALPINE
ISSN (print) / ISBN 1011-1344
Zeitschrift Journal of Photochemistry and Photobiology B-Biology
Quellenangaben Band: 64, Heft: 1, Seiten: 36-44 Artikelnummer: , Supplement: ,
Verlag Elsevier
Nichtpatentliteratur Publikationen
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Soil Ecology (IBOE)