caa a22 4500 469096098 CHVBK 20180323133031.0 cr unu---uuuuu 170328e19921201xx s 000 0 eng 10.1007/BF00317845 doi (NATIONALLICENCE)springer-10.1007/BF00317845 Comparative ecophysiology of five species of Sedum (Crassulaceae) under well-watered and drought-stressed conditions [Elektronische Daten] [Dennis Gravatt, Craig Martin] Summary: Gas exchange patterns, diurnal malic acid fluctuations, and stable carbon isotope ratios of five species of Sedum were investigated to assess the ecophysiological characteristics of three different photosynthetic pathways under well-watered and drought-stressed conditions. All five species have succulent leaves and stems and were examined under identical environmental conditions. When well-watered, Sedum integrifolium (Raf.) Nels. and S. ternatum Michx. displayed C3 photosynthesis, S. telephioides Michx. and S. nuttallianum Raf. exhibited CAM-cycling, and S. wrightii A. Gray showed CAM. When grown under a less frequent watering regime, S. integrifolium and S. ternatum exhibited CAM-cycling, whereas S. telephioides and S. nuttallianum displayed CAM-cycling simultaneously with low-level CAM. Sedum wrightii retained its CAM mode of photosynthesis. In general, leaf δ13C values reflected these variations in photosynthetic pathways. While all values of water-use efficiency (WUE) were greater than those reported for most C3 and C4 species, no correlation of malic acid accumulation in the CAM and CAM-cycling (including low-level CAM) species with increased WUE was found. Sedum wrightii (CAM) had the highest WUE value at night, yet its 24-h WUE was not different from S. ternatum when the latter was in the C3 mode. Thus, relative water-use efficiencies of these species of Sedum were not predictable based on photosynthetic pathways alone. Springer-Verlag, 1992 Carbon isotope ratios nationallicence Crassulacean acid metabolism nationallicence CAM-cycling nationallicence Gas exchange nationallicence Water-use efficiency nationallicence Gravatt Dennis Department of Botany, University of Kansas, 66045-2106, Lawrence, KS, USA aut Martin Craig Department of Botany, University of Kansas, 66045-2106, Lawrence, KS, USA aut Oecologia Springer-Verlag 92/4(1992-12-01), 532-541 0029-8549 92:4<532 1992 92 442 https://doi.org/10.1007/BF00317845 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317845 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gravatt Dennis Department of Botany, University of Kansas, 66045-2106, Lawrence, KS, USA aut NATIONALLICENCE 700 1- Martin Craig Department of Botany, University of Kansas, 66045-2106, Lawrence, KS, USA aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 92/4(1992-12-01), 532-541 0029-8549 92:4<532 1992 92 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer