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Science 15 April 1994:
Vol. 264. no. 5157, pp. 421 - 424
DOI: 10.1126/science.264.5157.421
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Articles

Stomatal Size in Fossil Plants: Evidence for Polyploidy in Majority of Angiosperms

Jane Masterson 1

1 Committee on Evolutionary Biology, University of Chicago, 5734 South Ellis Avenue, Chicago, IL 60637, USA. E-mail: masters@midway.uchicago.edu.

Three published estimates of the frequency of polyploidy in angiosperms (30 to 35 percent, 47 percent, and 70 to 80 percent) were tested by estimating the genome size of extinct woody angiosperms with the use of fossil guard cell size as a proxy for cellular DNA content. The inferred chromosome numbers of these extinct species suggest that seven to nine is the primitive haploid chromosome number of angiosperms and that most angiosperms (approximately 70 percent) have polyploidy in their history.

Submitted on November 19, 1993
Accepted on February 25, 1994


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