Journal of Experimental Botany, Vol. 54, No. 383, pp. 861-865,
February 1, 2003
© 2003 Oxford University Press
Night-time conductance in C3 and C4 species: do plants lose water at night?
Received 2 May 2002; Accepted 16 October 2002
1 Plant Biology, University of Georgia, Athens, GA 30602, USA
2 Land, Air and Water Resources, University of California, Davis, CA 95616, USA
3 Present address and to whom correspondence should be sent: USDA-ARS Jornada Experimental Range, MSC 3JER, NMSU, Box 30003, Las Cruces, NM 88003-8003, USA. Fax: +1 505 646 5889. E-mail: kasnyder{at}nmsu.edu
Significant night-time stomatal conductance and transpiration were found for 11 out of 17 species with a range of life histories (herbaceous annual, perennial grass, shrub, tree), photosynthetic pathways (C3, C4), and habitats in the western United States. Across species and habitats, higher night-time conductance and transpiration were associated with higher daytime values. The prevalence, mechanisms and ecological implications of substantial night-time water loss deserve further investigation.
Key words: Gas exchange, Great Basin desert, Mojave desert, night-time stomatal conductance, night-time transpiration, sap flow, stomatal conductance, transpiration.
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