The genetics of reproductive organ morphology in two Petunia species with contrasting pollination syndromes

Hermann, Katrin; Klahre, Ulrich; Venail, Julien; Brandenburg, Anna; Kuhlemeier, Cris (2015). The genetics of reproductive organ morphology in two Petunia species with contrasting pollination syndromes. Planta, 241(5), pp. 1241-1254. Springer 10.1007/s00425-015-2251-2

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Main conclusion Switches between pollination syndromes have happened frequently during angiosperm evolution. Using QTL mapping and reciprocal introgressions, we show that changes in reproductive organ morphology have a simple genetic basis. In animal-pollinated plants, flowers have evolved to optimize pollination efficiency by different pollinator guilds and hence reproductive success. The two Petunia species, P. axillaris and P. exserta, display pollination syndromes adapted to moth or hummingbird pollination. For the floral traits color and scent, genetic loci of large phenotypic effect have been well documented. However, such large-effect loci may be typical for shifts in simple biochemical traits, whereas the evolution of morphological traits may involve multiple mutations of small phenotypic effect. Here, we performed a quantitative trait locus (QTL) analysis of floral morphology, followed by an in-depth study of pistil and stamen morphology and the introgression of individual QTL into reciprocal parental backgrounds. Two QTLs, on chromosomes II and V, are sufficient to explain the interspecific difference in pistil and stamen length. Since most of the difference in organ length is caused by differences in cell number, genes underlying these QTLs are likely to be involved in cell cycle regulation. Interestingly, conservation of the locus on chromosome II in a different P. axillaris subspecies suggests that the evolution of organ elongation was initiated on chromosome II in adaptation to different pollinators. We recently showed that QTLs for pistil and stamen length on chromosome II are tightly linked to QTLs for petal color and volatile emission. Linkage of multiple traits will enable major phenotypic change within a few generations in hybridizing populations. Thus, the genomic architecture of pollination syndromes in Petunia allows for rapid responses to changing pollinator availability.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant Development
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Hermann, Katrin; Klahre, Ulrich; Venail, Julien; Brandenburg, Anna and Kuhlemeier, Cris

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0032-0935

Publisher:

Springer

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

21 Sep 2015 10:48

Last Modified:

21 Sep 2015 10:48

Publisher DOI:

10.1007/s00425-015-2251-2

Uncontrolled Keywords:

Mating system evolution, Near-isogenic lines, QTL, Petunia Reproductive organ morphology, Speciation

BORIS DOI:

10.7892/boris.71730

URI:

https://boris.unibe.ch/id/eprint/71730

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