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Journal Article

Heat Production in Cycad Cones

William Tang
Botanical Gazette
Vol. 148, No. 2 (Jun., 1987), pp. 165-174
Stable URL: http://www.jstor.org/stable/2995471
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Heat Production in Cycad Cones
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Abstract

Thermogenesis occurs in the strobili of 42 of 43 species in the 10 genera of cycads, indicating a wide-spread phenomenon in this group. Heat production generally follows a circadian rhythm, and its strength and duration are positively correlated with strobili size. Male strobili contain high concentrations of starch that may supply the energy for thermogenesis. Strobili of all examined species release odors that are sweet, resiny, or musty. Heat production in the strobili may help to volatilize odors that attract insects for pollination.

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