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Journal of Heredity Advance Access published online on January 5, 2007
Journal of Heredity, doi:10.1093/jhered/esl063
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© The American Genetic Association. 2007. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Genetic Architecture of Leaf Ecophysiological Traits in Helianthus

Larry C. Brouillette, David M. Rosenthal, Loren H. Rieseberg, Christian Lexer, Russell L. Malmberg, and Lisa A. Donovan

From the Department of Plant Biology, University of Georgia, 2502 Miller Plant Sciences, Athens, GA 30602 (Brouillette, Malmberg, and Donovan); the Department of Biology, Portland State University, P.O. Box 751, Portland, OR 97207 (Rosenthal); the Department of Botany, University of British Columbia, 6270 University Boulevard, Vancouver, BC V6T 1Z4 (Rieseberg); the Department of Biology, Indiana University, Bloomington, IN 47405 (Rieseberg); and the Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3DS (Lexer)

Address correspondence to L. C. Brouillette at the address above, or e-mail: beau{at}plantbio.uga.edu.

We investigated quantitative trait loci (QTLs) for several leaf chemistry traits in early-generation hybrids between Helianthus annuus and Helianthus petiolaris, the parental species of the ancient diploid hybrid sunflower species Helianthus anomalus, Helianthus deserticola, and Helianthus paradoxus. We grew individuals of a second-generation backcross (BC2) toward H. petiolaris under optimum conditions in a glasshouse experiment. Trait values were measured once for each individual. In addition, genotypic data previously determined for each individual were employed for composite interval mapping of QTLs. We detected QTLs for leaf carbon concentration, leaf nitrogen concentration, leaf nitrogen per unit area, and photosynthetic nitrogen use efficiency. Leaf carbon isotope discrimination ({delta}13C) and leaf nitrogen isotopic composition ({delta}15N) were analyzed, but no significant QTLs were found for these traits. Interestingly, two neighboring loci explained a relatively large percentage of the variation in leaf nitrogen per unit area. This was notable because leaf nitrogen has been shown to strongly affect the fitness of early-generation sunflower hybrids in the H. anomalus habitat, and QTLs of large effect are expected to respond relatively quickly to selection. We speculate that the genetic architecture underlying leaf nitrogen may have facilitated the colonization of active desert sand dunes by H. anomalus.


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