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Thermogenesis has been documented in plant reproductive organs of a few species within many different angiosperm families and in cones of most cycad species. Cones of cycads are thermogenic during their pollination period, during and just following a pollen cone™s dehiscence, and during ovule receptivity. Some species have a daily thermogenic event with a peak temperature during late morning or midday, while other species have a peak temperature during the early evening. A third pattern has been identified in Cycas micronesica pollen cones. These cones have a small, but continuous, thermogenesis with a peak during the afternoon. Several species of Cycas were studied at Montgomery Botanical Center in Coral Gables, Florida, to determine whether they followed one of the previously reported patterns. We found that within the 7 species studied, all three patterns were observed.
Keywords: thermogenesis, Macrozamia, Cycas, pollination, island cycads