Journal of Experimental Botany, Vol 49, 1213-1217, Copyright © 1998 by Oxford University Press
R Seymour, P Schultze-Motel and I Lamprecht
Flowers of the sacred lotus, Nelumbo nucifera,
maintain receptacle temperature (Tr) between about
30
ARTICLES
Heat production by sacred lotus flowers depends on ambient temperature, not light cycle
Department of Zoology, University of Adelaide, Adelaide, South Australia 5005; Institute of Biophysics, Free University of Berlin, Thielallee 63, D-14195 Berlin, Germany; Corresponding author; e-mail: rseymour@zoology.adelaide.edu.au
C and 36C
during their 2-4 d sequence of anthesis by increasing the rate of heat
production, measured as oxygen consumption (VO2), at
low ambient temperature (Ta) at night and reducing it
at high Ta during the day. The effects of
Ta and photoperiod on VO2 were
separated by manipulating Ta around outdoor flowers
under natural photoperiod or constant darkness. There was no effect of time
of day on either Tr or VO2, but
both depended on Ta. Rising Ta
resulted in an increase in Tr, a brief upward spike in
VO2, followed by a long-term decrease in
VO2. Decreasing Ta had the
opposite effects: a decrease in Tr and a brief
depression, followed by a slow rise, in VO2. The
two-phase responses to sudden Ta change indicate a
rapid, mass-action effect and a slower, regulatory adjustment. Temperature
regulation continued in constant darkness for over 3 d.Keywords:
Thermoregulation, lotus, photoperiod, temperature, heat
production, oxygen consumption, Nelumbonaceae.
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