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Anatomy of an Orchid Flower

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Anatomy of an Orchid Flower
Despite the astonishing diversity found in the thousands of wild species and man-made hybrids, orchid flowers show an unmistakable family resemblance. Orchid flowers are generally bilaterally symmetrical—only a single imaginary line can be drawn through a flower to create a mirror image.
A typical orchid flower has three sepals (the outer segments that protect the bud before the flower opens), alternating with three petals. The petals and sepals may be similar or not, showy or inconspicuous.
The middle petal, which is always opposite the column, is usually quite different from the others. Called the lip or labellum, it comes in a variety of shapes, depending on the species, and can be wavy or fringed or covered with hairs or other structures. The labellum often serves as a landing pad and attractant for insect pollinators.
University of Chicago Press Journals. (2009, December 28). Orchids' sexual trickery explained: Leads to more efficient pollinating system. ScienceDaily. Retrieved December 3, 2014 from www.sciencedaily.com/releases/2009/12/091217183442.htm new study reveals the reason why orchids use sexual trickery to lure insect pollinators. The study, published in the January issue of The American Naturalist, finds that sexual deception in orchids leads to a more efficient pollinating system.
While most flowering plants reward pollinators with tasty nectar, many orchid species turn to trickery. Some use what's called food deception. They produce flowers that look or smell like they offer food, but offer no edible reward. Other orchids use sexual deception. They produce flowers that look or smell like female insects, usually bees or wasps. Males are drawn to the sexy flowers and attempt to mate with it. In doing so, they accidentally collect pollen on their bodies, which fertilizes the next orchid they visit.
From an evolutionary perspective, the sexual strategy is a bit puzzling. Orchids that offer nectar or mimic food can attract a wide variety of food-seeking pollinators -- bees, wasps, flies, ants and so on. But sexual displays are only attractive to the males of a single species -- a flower that looks like a female wasp is only going to attract male wasps, not other insects. So in appealing to sex, these orchids limit their potential pollinators, which would seem to be a reproductive disadvantage.
Despite the apparent drawback, sexual deception has evolved several times in different types of orchids. So there must be some selective advantage, and researchers Salvatore Cozzolino and Giovanni Scopece of the University of Naples Federico II, Steven Johnson of University of KwaZulu-Natal (South Africa) and Florian Schiestl of the University of Zürich appear to have figured out what it is.

Schiestl and his team observed populations of 31 orchid species with varying pollination strategies in Italy and Western Australia. They measured the amount of pollen that was taken from each orchid, and the amount of pollen that made it to its intended destination -- another orchid of the same species.

They found that populations of sexually deceptive orchids had higher "pollen transport efficiency" than the species with multiple pollinators. In other words, a higher percentage of the pollen that was taken from sexually deceptive orchids actually made it to another orchid of the same species. The orchids with multiple pollinators had more pollen taken from their flowers, but more of that pollen was lost -- dropped to the ground or deposited in flowers of the wrong species.

So it appears that specializing with one pollinator -- and appealing to it with sex -- makes for a more direct line from one orchid flower to another, with less precious pollen lost in the transport process.

"These results could provide new insights in the understanding of evolutionary shifts between generalized to specialized pollination strategies in flowering plants," says Scopece, "and that sexy orchids do it better!"

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