Floral integration is more related to mating than pollination system

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Almost 60 years ago, Berg proposed that floral integration and pollination system should be associated as a consequence of the selective pressures promoting successful cross-pollination. Evidence, however, suggests instead an association between floral integration and mating system.

Schematic representation of the protocol to estimate floral integration based on morphometric measures of floral traits.
Schematic representation of the protocol to estimate floral integration based on morphometric measures of floral traits. See Fornoni et al. for more details.

Fornoni et al. use a phylogenetically informed meta-analysis to show outcrossing species have lower floral integration than selfing species due to higher integration of sexual organs than perianth traits. Accordingly, the evolution of selfing seems to be associated with changes in intra-floral integration of sexual traits, thus suggesting that this complex attribute should be considered as a critical component of the selfing syndrome.

Reference

Juan Fornoni, Mariano Ordano, Rubén Pérez-Ishiwara, Karina Boege, César A. Domínguez, 2015, 'A comparison of floral integration between selfing and outcrossing species: a meta-analysis', Annals of Botany, p. mcv166 http://dx.doi.org/10.1093/aob/mcv166


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