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Titolo:
Implications of genotypic diversity and phenotypic plasticity in the ecophysiological success of CAM plants, examined by studies on the vegetation ofMadagascar
Autore:
Kluge, M; Razanoelisoa, B; Brulfert, J;
Indirizzi:
Tech Univ Darmstadt, Inst Bot, D-64287 Darmstadt, Germany Tech Univ Darmstadt Darmstadt Germany D-64287 D-64287 Darmstadt, Germany Univ Paris Sud, Inst Biotechnol Plantes, Orsay, France Univ Paris Sud Orsay France Sud, Inst Biotechnol Plantes, Orsay, France
Titolo Testata:
PLANT BIOLOGY
fascicolo: 3, volume: 3, anno: 2001,
pagine: 214 - 222
SICI:
1435-8603(200105)3:3<214:IOGDAP>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRASSULACEAN ACID METABOLISM; VASCULAR EPIPHYTES; SUCCULENT PLANTS; GENUS KALANCHOE; DELTA-C-13;
Keywords:
CAM diversity; carbon isotope composition; Madagascar;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Kluge, M Tech Univ Darmstadt, Inst Bot, Schnittpahnstr 10, D-64287 Darmstadt, Germany Tech Univ Darmstadt Schnittpahnstr 10 Darmstadt Germany D-64287
Citazione:
M. Kluge et al., "Implications of genotypic diversity and phenotypic plasticity in the ecophysiological success of CAM plants, examined by studies on the vegetation ofMadagascar", PLANT BIO, 3(3), 2001, pp. 214-222

Abstract

On the basis of delta C-13-values, genotypic diversity and phenotypic plasticity of CAM behaviour in plants of the Malagasy vegetation is surveyed. The study compares CAM patterns performed in the wild on the levels of genera (Kolanchoe [Crassulaceae], Angraecum [Orchidaceae], Lissochilus [Orchidaceae] and Rhipsalis [Cactaceae]), on the level of a family (Didiereaceae) and finally on the level of a common growth form, namely in leafless orchids. For Rhipsolis, also non-Malagasy species were included in the comparison. The genus Kalanchoe; was found to be dominated by species representing the CAM-physiotype with CO, fixation taking place only during the night, whereas the CAM/C3- and the C3-physiotypes (with limited intrinsic CAM potential)were less frequent. The opposite holds true for Angroecum. In the genus Rhipsolis, in the Didiereacean family and in the leafless orchids only the CAM-physiotype is represented. The photosynthetic physiotypes of CAM plants were found to be related to the environmental conditions of the habitat. That is, strong CAM performers are typically abundant in the dry climatic zones or at otherwise dry niches, species of the C3-physiotype (possibly with weak intrinsic capability of CAM performance) are distributed at humid sitesand those of the CAM/C3-physiotype occupy sites with medium and changing exposure to stress. Phenotypic plasticity of CAM, as indicated by the intraspecific variability of the delta C-13-values, was lower in the CAM-physiotype compared with the CAM/C3-physiotype. Our data support the view that strong stress leads to the dominance of highly adapted specialists among the CAM plants, with low phenotypic plasticity of the photosynthetic behaviour, whereas medium stress advances the unfolding of plastic CAM behaviour. Moreover, the data suggest that genera comprising all three physiotypes (Kolonchoe Angroecum) are dispersed all over Madagascar, whilst groups comprising only strong CAM performers are restricted to limited areas or special types of habitats. This suggests that both genotypic diversity and phenotypic plasticity are important factors for the ecophysiological success of CAM.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 18:09:25