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University of Tennessee scientist: Flowers' rapid growth rate can be traced back 65 million years
Date:5/10/2011

Researchers have discovered that an evolutionary change from 65 million years ago may have set the pace for the rapid growth rate of present-day flowering plants.

Taylor Feild, associate professor of ecology and evolutionary biology at the University of Tennessee, Knoxville, in collaboration with a group of other researchers from around the world, have determined the precise dates that angiosperms, or flowering plants, experienced two surges in growth during the Cretaceous period.

Their findings are published in the current edition of the Proceedings of the National Academy of Sciences.

The researchers measured the vein densities, or number and length of veins in a given area, in the fossils of more than 300 angiosperm leaves and then compared them to the fossils of nonangiosperms that lived at the same time.

"Because leaf veins supply the water necessary for how plants 'eat' the air to obtain carbon dioxide that is necessary for growth and reproduction, the discovery of shift toward densely veined leaves during the latest Cretaceous strongly suggests that modern functioning vegetation first appeared during that time," Feild said.

The results also provide additional evidence that modern tropical rainforests appear to be no older than the latest Cretaceous.


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Contact: Whitney Holmes
wholmes7@utk.edu
865-974-5460
University of Tennessee at Knoxville
Source:Eurekalert

Page: 1

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