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Titolo:
ECOPHYSIOLOGICAL STUDIES IN KALANCHOE-PORPHYROCALYX (BAKER) AND KALANCHOE-MINIATA (HILS ET BOJER), 2 SPECIES PERFORMING HIGHLY FLEXIBLE CAM
Autore:
BRULFERT J; RAVELOMANANA D; GUCLU S; KLUGE M;
Indirizzi:
UNIV PARIS 11,INST BIOTECHNOL PLANTES,URA CNRS 1128 F-91405 ORSAY FRANCE EES SCI,LAB PHYSIOL VEGETALE ANTANANARIVO MALAGASY REPUBL TH DARMSTADT,INST BOT D-64287 DARMSTADT GERMANY
Titolo Testata:
Photosynthesis research
fascicolo: 1, volume: 49, anno: 1996,
pagine: 29 - 36
SICI:
0166-8595(1996)49:1<29:ESIK(A>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRASSULACEAN ACID METABOLISM; MADAGASCAR;
Keywords:
BIOGEOGRAPHY; CRASSULACEAN ACID METABOLISM; ECOPHYSIOLOGY; KALANCHOE; MADAGASCAR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
J. Brulfert et al., "ECOPHYSIOLOGICAL STUDIES IN KALANCHOE-PORPHYROCALYX (BAKER) AND KALANCHOE-MINIATA (HILS ET BOJER), 2 SPECIES PERFORMING HIGHLY FLEXIBLE CAM", Photosynthesis research, 49(1), 1996, pp. 29-36

Abstract

Preceding results, based on the determination of stable carbon isotope composition (delta(13)C) of leaf tissues from various Kalanchoe species, suggested a close coincidence between the photosynthetic flexibility of the species and their habitat, life form and taxonomic positionwithin the genus. The ability to shift from C-3- to Crassulacean AcidMetabolism (CAM)-type of photosynthesis seemed to concern in particular the more ancestral species in the genus and to be linked to epiphytism and changing climatic situations. For deeper insights into these interrelationships, physiological studies in controlled conditions werecarried out on K. miniata and K. porphyrocalyx. These two species differ by their habitat preference and li:Fe form. Measurements were conducted on CO2 exchange patterns, day/night fluctuation of malate content in the leaves and 'capacity' of phosphoenolpyruvate carboxylase (PEPC). The results show that the 2 species can be considered as 'facultative' CAM plants, with very high flexibility in their photosynthetic behaviour. The decrease in water availability seems to be a major factortriggering the shift from C-3 to the CAM mode. In K. miniata, 21 daysof drought depressed CO2 uptake to the level of CAM idling whereas inK. porphyrocalyx, CO2 exchange was considerably more resistant. At least for K. miniata, short-day treatment was found to be a further CAM-inducing factor. The results are discussed in terms of their ecophysiological significance under the environmental conditions of the sites where the investigated species naturally grow.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 03:36:30