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Journal of Heredity Advance Access originally published online on May 21, 2008
Journal of Heredity 2008 99(5):558-563; doi:10.1093/jhered/esn031
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© The American Genetic Association. 2008. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Brief Communications

Genetic Control of Floral Morph in Tristylous Pickerelweed (Pontederia cordata L.)

Lyn A. Gettys, and David S. Wofford

From the Department of Agronomy Plant Genetics and Breeding, University of Florida Institute of Food and Agricultural Sciences IFAS, 304 Newell Hall, Box 110500, Gainesville, FL

Address correspondence to Lyn A. Gettys at University of Florida Center for Aquatic and Invasive Plants, 7922 NW 71 Street, Gainesville, FL 32653, or e-mail: lgettys{at}ufl.edu.

Pickerelweed (Pontederia cordata L.) is a diploid (2n = 2x = 16) tristylous aquatic perennial. Populations usually contain 3 floral morphs that differ reciprocally in style length and anther height (referred to as the long-, mid-, and short-styled morphs, hereafter L-, M-, and S-morphs). The floral polymorphism promotes disassortative mating among the 3 floral morphs and is maintained in populations by negative frequency-dependent selection. The objective of this study was to determine the number of loci, number of alleles, and gene action controlling floral morph in pickerelweed. Three parental lines (one each of the L-, M-, and S-morph) were used to create S1 and F1 populations. F2 populations were produced through self-pollination of F1 plants. Progeny ratios of S1, F1, and F2 generations revealed that tristyly is controlled by 2 diallelic loci (S and M) with dominant gene action. The S locus is epistatic to the M locus, with the S-morph produced by plants with the dominant S allele (genotype S _ _ _). Plants with recessive alleles at the S locus were either L-morph (ssmm) or M-morph (ssM_). The results of this experiment demonstrate that the inheritance of tristyly in pickerelweed is the same as previously reported for several tristylous species in the Lythraceae and Oxalidaceae.

Corresponding Editor: John Burke

Received November 19, 2007
Accepted April 10, 2008


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