Respiratory gas exchange during thermogenesis inPhilodendron selloum Koch

Authors

Roger S. Seymour
M. Christopher BarnhartFollow
George A. Bartholomew

Abstract

During peak thermogenesis of anthesis, high rates of respiration by the sterile male florets on the spadix of Philodendron selloum significantly reduce the oxygen tension (P_O2) and raise CO₂ tension between the florets. Nevertheless, respiration is not limited by the availability of O₂ under natural conditions. At experimental P_O2 below about 17 kPa, however, florets begin to show decreased O₂ consumption. A respiratory exchange ratio of 0.83 indicates that the major energy source is not starch, but is probably lipid.

Document Type

Article

DOI

https://doi.org/10.1007/BF00982917

Keywords

lipid respiration, Philodendron, respiratory exchange ratio, spadix, thermogenesis

Publication Date

5-1-1984

Recommended Citation

Seymour, Roger S., M. Christopher Barnhart, and George A. Bartholomew. "Respiratory gas exchange during thermogenesis inPhilodendron selloum Koch." Planta 161, no. 3 (1984): 229-232.

Journal Title

Planta