Researchers report finding first bidirectional color-changing flower variety SciReports
-changing flowers do so because it signals to pollinating insects that the flower is ready to supply nectar or pollen which rewards them. This is considered to be an"honest" signal.
Whatever the strategy of the plant in question, all examples of color-changing flowers found have been unidirectional: Once the color has changed, it does not change back. So, imagine the surprise University of Tokyo Professor Hirokazu Tsukaya must have felt when he saw a flower of the plant Causonis japonica change color, and then change again, and again.
"My colleague Professor Nobumitsu Kawakubo from Gifu University is an expert in time-lapse, long-period video recordings of pollinating flowers. He and his student originally tried to explore the pollinating behaviors between the different kinds of Causonis japonica and expected to see the familiar change from its default orange color to bright pink.
Thanks to the carefully captured time-lapse videos from the field and detailed observations in the laboratory, Tsukaya managed to connect which physiological changes took place in the flowers concurrent with their changes in colors., when it is secreting nectar," said Tsukaya.
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