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Titolo:
Variability of CAM in leaf-deciduous succulents from the Succulent Karoo (South africa)
Autore:
Veste, M; Herppich, WB; von Willert, DJ;
Indirizzi:
Inst Agrartechn Bornim EV, Abt Techn Gartenbau, D-14469 Potsdam, Germany Inst Agrartechn Bornim EV Potsdam Germany D-14469 14469 Potsdam, Germany Univ Munster, Inst Okol Pflanzen, Inst Plant Ecol, D-48143 Munster, Germany Univ Munster Munster Germany D-48143 lant Ecol, D-48143 Munster, Germany Univ Hamburg, Inst Allgemeine Bot, D-22609 Hamburg, Germany Univ Hamburg Hamburg Germany D-22609 meine Bot, D-22609 Hamburg, Germany Univ Hamburg, Bot Garten, D-22609 Hamburg, Germany Univ Hamburg Hamburg Germany D-22609 ot Garten, D-22609 Hamburg, Germany
Titolo Testata:
BASIC AND APPLIED ECOLOGY
fascicolo: 3, volume: 2, anno: 2001,
pagine: 283 - 288
SICI:
1439-1791(2001)2:3<283:VOCILS>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
ECOPHYSIOLOGICAL INVESTIGATIONS; WATER RELATIONS; GAS-EXCHANGE; METABOLISM; LAMIACEAE; PLANTS;
Keywords:
adaptational strategies; CAM flexibility; night-time organic acid accumulation photosynthesis; Succulent Karoo;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Herppich, WB Inst Agrartechn Bornim EV, Abt Techn Gartenbau, Max Eyth Allee 100, D-14469 Potsdam, Germany Inst Agrartechn Bornim EV Max Eyth Allee 100 Potsdam Germany D-14469
Citazione:
M. Veste et al., "Variability of CAM in leaf-deciduous succulents from the Succulent Karoo (South africa)", BASIC AP EC, 2(3), 2001, pp. 283-288

Abstract

Seasonal or drought-induced deciduousness is a common adaptational strategy in aboveground persistent succulent species native to the Succulent Karoo(South Africa). This feature may appear together with crassulacean acid metabolism (CAM) in stems and/or leaves. Due to differences in morphology or life cycle, different species may exhibit different degrees of flexibility in the expression of CAM. The potential for CAM plasticity has not been investigated in leaf-deciduous succulents of the Succulent Karoo, Diurnal gas exchange and nocturnal organic acid accumulation were measured to investigate whether the expression of CAM may vary in Tylecodon paniculatus (L.F. ) Toelken (Crassulaceae), Monilaria moniliformis (Mesembryanthemaceae) and Ceraria fruticulosa H. Pearson & Stephens (Portulacaceae), a selection of leaf-deciduous succulents. These species differ both in leaf and stem morphology. In the seasonal deciduous Tylecodon paniculatus only obligate CAM was found, regardless of the plant water status. When droughted Monilaria moniliformis switches directly from CAM-cycling (C-3-like diurnal gas exchange patterns combined with nocturnal acid accumulation) to CAM-idling (gas exchange completely ceased while acid accumulation still continued). This seasonaldeciduous species has also both succulent leaves and stem. A highly flexible CAM expression (CAM-cycling, full-CAM and CAM-idling) was observed in the drought deciduous Ceraria fruticulosa (non-succulent stem showing no CAM)in response to changes in water availability. The ecological significance of the observed diversity in the flexibility of CAM expression was discussed in terms of morphological traits, and the relative ecological significance of both metabolic adaptation and leaf-deciduousness.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 06:49:27