Document Detail

Reproductive biology of Cyrtopodium polyphyllum (Orchidaceae): a Cyrtopodiinae pollinated by deceit.
MedLine Citation:
PMID:  18761503     Owner:  NLM     Status:  MEDLINE    
The genus Cyrtopodium comprises about 42 species distributed from southern Florida to northern Argentina. Cyrtopodium polyphyllum occurs on rocks or in sandy soils, in restinga vegetation along the Brazilian coast. It flowers during the wet season and its inflorescences produce a high number of resupinate yellow flowers. Cyrtopodium polyphyllum offers no rewards to its pollinators, but mimics the yellow, reward-producing flowers of nearby growing Stigmaphyllon arenicola (oil) and Crotalaria vitellina (nectar) individuals. Several species of bee visit flowers of C. polyphyllum, but only two species of Centris (Centris tarsata and Centris labrosa) act as pollinators. Visits to flowers of C. polyphyllum were scarce and, as a consequence, low-fruit set was recorded under natural conditions. Such low-fruit production contrasts with the number of fruits each plant bears after manual pollination, suggesting deficient pollen transfer among plants. C. polyphyllum is self-compatible and has a high-fruit set in both manual self- and cross-pollinated flowers. Furthermore, fruits (2%) are formed by self-pollination assisted by rain. This facultative self-pollination mechanism is an important strategy to provide reproductive assurance to C. polyphyllum as rainfall restricts the foraging activity of its pollinating bees. Fruits derived from treatments and under natural conditions had a similar high rate of potentially viable seed. Moreover, these seeds had a low polyembryony rate, which did not exceed 5%. C. polyphyllum acts by deceit involving optical signals and exploits other yellow-flowered species within its habitat by attracting their pollinators. The low capsule production under natural conditions was expected, but its reproductive success is assured through self-pollination by rain and high seed viability.
L M Pansarin; E R Pansarin; M Sazima
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Plant biology (Stuttgart, Germany)     Volume:  10     ISSN:  1435-8603     ISO Abbreviation:  Plant Biol (Stuttg)     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-09-02     Completed Date:  2008-10-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101148926     Medline TA:  Plant Biol (Stuttg)     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  650-9     Citation Subset:  IM    
Departamento de Botânica, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, São Paulo, Brazil.
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MeSH Terms
Adaptation, Biological
Behavior, Animal*
Flowers / physiology*
Fruit / physiology
Orchidaceae / physiology*
Seeds / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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