Disruption of the distylous syndrome in Primula veris
Identifieur interne : 000109 ( Main/Exploration ); précédent : 000108; suivant : 000110Disruption of the distylous syndrome in Primula veris
Auteurs : Rein Brys [Belgique] ; Hans Jacquemyn [Belgique]Source :
- Annals of Botany [ 0305-7364 ] ; 2014.
Abstract
Url:
DOI: 10.1093/aob/mcu211
PubMed: 25429005
PubMed Central: 4284109
Affiliations:
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Le document en format XML
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<affiliation wicri:level="1"><nlm:aff id="mcu211-AFF1">Research Institute for Nature and Forest, Kliniekstraat 25, BE-1070 Brussels, Belgium</nlm:aff>
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<series><title level="j">Annals of Botany</title>
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<front><div type="abstract" xml:lang="en"><p><bold>Background and Aims</bold>
Distyly is a floral polymorphism characterized by the presence of two discrete morphs with reciprocal positioning of anthers and stigmas in flowers on different plants within the same population. Although reciprocal herkogamy and associated floral traits are generally thought to be discrete and strict polymorphisms, little is known about variation in floral traits related to the distylous syndrome within and among populations of a single species. In this study, variation in floral morphology and reciprocal positioning of the sexual organs in the distylous <italic>Primula veris</italic>
(cowslip) is quantified.</p>
<p><bold>Methods</bold>
Data were collected in ten populations occurring in two contrasting habitat types (grasslands and forests), and for each population the average level of reciprocity was assessed, the strength of the self-incompatibility system was determined, and seed production under natural conditions was quantified.</p>
<p><bold>Results</bold>
In grassland populations, flowers showed clear distyly with low and symmetric reciprocity indices at both the lower and upper level. In forests, <italic>P. veris</italic>
produced larger flowers that showed strong deviations in stigma–anther separation, especially in the L-morph. This deviation was mainly driven by variation in stigma height, resulting in high and asymmetric reciprocity indices and the occurrence of several short-styled homostylous plants. Self-incompatibility was, however, strict in both habitats, and morph ratios did not differ significantly from isoplethy. The observed shift in reciprocity in forest populations was associated with a significant reduction in seed production in the L-morph.</p>
<p><bold>Conclusions</bold>
The results indicate that populations of <italic>P. veris</italic>
show habitat-specific variation in flower morphology. Deviations from perfect reciprocal positioning of stigmas and anthers also translate into reduced seed production, suggesting that small changes in sexual organ reciprocity can have far-reaching ecological and evolutionary implications.</p>
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</front>
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