Prof. Herrera said: "No one has paid much attention to the corollas, collections of petals on a flower, when they shrivel. Their job is done, so it's no surprise they die. But if their job is done, why don't the petals simply drop off the plant? I thought there might be an advantage that kept the old corollas on the plant."
To test his idea, Herrera conducted a very simple experiment. He removed dead petals from some lavender. Then he observed what happened to the seeds.
Prof. Herrera said: "The results for the lavender were striking. Normally you'd expect around 60% of the lavender fruits to ripen. Without the withered petals around the fruit, only 40% ripened. The dead petals seem to have formed a protective barrier around the fruit. In this case the barrier helps prevent attack by gnat larvae who like to feed on lavender seeds."
He also tried the same experiment with some violas, but got a different result.
"For violas I found that the petals helped increase the number of seeds per fruit, but had no effect on ripening. It's clear that the petals are doing something important for the plant after they decay, but it is a complex relationship that needs more study. Still, it shows there is a major role for petals to play on a plant, even after the bloom of youth has gone."
Photos by Prof Herrera can be downloaded from: http://www.dropbox.com/gallery/565860/1/Herrera?h=6137fd
Note for Editors: Prof. Herrera's research is published as "The results are published as "Marcescent corollas as functional structures: effects on the fecundity of two insect-pollinated plants" in the Annals of Botany. doi:10.1093/aob/mcq160 which will be online from the 24th of September 2010.
Prof. Herrera can be contacted at: firstname.lastname@example.orgThe Annals of Botany is a monthly journal covering all areas of Plant Science.
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