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Three-dimensional reciprocity of floral morphs in wild flax (Linum suffruticosum): a new twist on heterostyly

Record type: Article

• Here, we studied the floral morphology and pollination of the distylous plant Linum suffruticosum (Linaceae) in southern Spain. • We observed a previously unreported form of distyly that involved twisting and bending of styles and stamens during floral development to achieve three-dimensional reciprocity of anthers and stigmas in the long-styled (pin) and short-styled (thrum) morphs. This developmental pattern causes pin pollen to be placed on the underside of pollinating Usia flies (Bombyliidae), and thrum pollen to be placed on the top of the thorax and abdomen. The pin stigmas contact the flies on the dorsum, apparently picking up predominantly thrum pollen, and the thrum stigmas contact the flies on the ventral surface, apparently picking up predominantly pin pollen. • This form of heterostyly would appear on morphological grounds to be far more efficient in dispersing pollen between compatible morphs than the typical pin–thrum system. If so, this plant fits Darwin’s prediction of efficient pollen flow between heterostylous morphs more closely than anything Darwin himself reported. • Molecular phylogenetic analyses indicate that this form of heterostyly evolved in a lineage that already had typical heterostyly. The analyses also indicate that there have been several independent origins of heterostyly in Linum and at least one reversal to stylar monomorphism.

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Citation

Armbruster, W. Scott, Pérez-Barrales, Rocio, Arroyo, Juan, Edwards, Mary E. and Vargas, Pablo (2006) Three-dimensional reciprocity of floral morphs in wild flax (Linum suffruticosum): a new twist on heterostyly New Phytologist, 171, (3), pp. 581-590. (doi:10.1111/j.1469-8137.2006.01749.x).

More information

Published date: August 2006
Keywords: disassortative pollen flow, distyly, flax, floral development, heterostyly, Linum suffruticosum (wild flax), pollination.

Identifiers

Local EPrints ID: 55275
URI: http://eprints.soton.ac.uk/id/eprint/55275
ISSN: 0028-646X
PURE UUID: 1358a80c-ced0-4425-9039-84c6b664f714

Catalogue record

Date deposited: 01 Aug 2008
Last modified: 17 Jul 2017 14:33

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Contributors

Author: W. Scott Armbruster
Author: Rocio Pérez-Barrales
Author: Juan Arroyo
Author: Mary E. Edwards
Author: Pablo Vargas

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