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- Title
Genetic Architecture of Leaf Ecophysiological Traits in Helianthus.
- Authors
Brouilette, Larry C.; Rosenthal, David M.; Rieseberg, Loren H.; Lexer, Christian; Malmberg, Rusell L.; Donovan, Lisa A.
- Abstract
We investigated quantitative trait loci (QTLs) for several leaf chemistry, traits in early-generation hybrids between Helianthus annuus and Helianthuspetiolaris, 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 (δ13C) and leaf nitrogen isotopic composition (δ15N) 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.
- Subjects
FOLIAR diagnosis; LEAVES; COMMON sunflower; SUNFLOWER genetics; PLANT species; PLANT gene mapping; PLANT genetics
- Publication
Journal of Heredity, 2007, Vol 98, Issue 2, p142
- ISSN
0022-1503
- Publication type
Article
- DOI
10.1093/jhered/esl063