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Titolo:
Mechanistic basis of differences in water-use efficiency between a CAM anda C-3 species of Peperomia (Piperaceae)
Autore:
Woerner, AC; Martin, CE;
Indirizzi:
Univ Kansas, Dept Bot, Lawrence, KS 66045 USA Univ Kansas Lawrence KS USA66045 ansas, Dept Bot, Lawrence, KS 66045 USA
Titolo Testata:
NEW PHYTOLOGIST
fascicolo: 2, volume: 144, anno: 1999,
pagine: 307 - 312
SICI:
0028-646X(199911)144:2<307:MBODIW>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRASSULACEAN ACID METABOLISM; PATHWAYS;
Keywords:
C-3 photosynthesis; Crassulacean acid metabolism; Peperomia; stomata; water-use efficiency;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Martin, CE Univ Kansas, Dept Bot, Lawrence, KS 66045 USA Univ Kansas Lawrence KS USA 66045 Bot, Lawrence, KS 66045 USA
Citazione:
A.C. Woerner e C.E. Martin, "Mechanistic basis of differences in water-use efficiency between a CAM anda C-3 species of Peperomia (Piperaceae)", NEW PHYTOL, 144(2), 1999, pp. 307-312

Abstract

Under ecologically realistic environmental conditions, the water-use efficiency (WUE) of Peperomia scandens, a CAM plant, was higher than that of theC-3 congener P. obtusifolia. This difference has been attributed to differences in stomatal activity between C-3 and CAM plants, coupled with differences in the evaporative demand of the atmosphere during which the stomata are open. This explanation has apparently not, however, been experimentally tested. Thus, WUEs were compared in these species in two experiments in which the atmospheric evaporative demand was identical (or nearly so) during the period of stomatal opening (i.e. during the night for the CAM plant and during the day for the C-3 species). In both experiments, the WUE of the CAM species was higher than that of the C-3 species. These results suggest that factors other than differences in atmospheric environmental conditions must also be responsible for the observed differences in WUE. Because CO2 uptake rates of the CAM species were substantially lower than those of the C-3 species, the lower WUE in the CAM species resulted primarily from lower transpiration rates. Lower rates of water loss in P. scandens, relative to rates in P. obtusifolia, were ascribed, in part, to lower stomatal densities. Thus, leaf morphological differences, in addition to differences in atmospheric evaporative demand, help to explain the high WUE typically measured in CAM plants.

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Documento generato il 08/08/20 alle ore 18:18:12