Document Detail

Floral biology and reproductive system of enantiostylous Senna corymbosa (Caesalpiniaceae).
MedLine Citation:
PMID:  17354419     Owner:  NLM     Status:  MEDLINE    
The genus Senna (K. Bahuin) Miller (Cassieae) is represented in Argentina by 35 species and several varieties distributed in temperate, tropical and subtropical regions, and presents a high degree of endemism. Some taxa are used for medicine, animal foraging and ornamental purposes. Floral morphology, phases, rewards, attractants, visitors, pollen, reproductive system, P/O ratio. OCI and ISI indexes of enantiostylous Senna corymbosa were analyzed for morphological androecial differentiation and possible related functional differences between stamens groups. The study was carried out over three consecutive flowering seasons in March of 1999, 2000 and 2001, in two populations near the city of Buenos Aires, Argentina. The species has a buzz-pollination syndrome. The pollinators are Bombus atratus that vibrate the stamens, leading to nothotribic or stemotribic deposition of pollen. P/O ratio and pollen production were high thanks to the precise pollinating mechanism that needs a large delivery of pollen to ensure effective pollen deposition. P/O ratio also indicates that the species is xenogamous, although geitonogamy and autogamy (only induced, not spontaneous) were also recorded. The species is self-compatible. There were differences in hand-pollination treatments between long and medium stamens in fruit set, as well as in vitro differential fertility between their pollen grains. Hence, there are morphological and functional androecium differences: the medium stamens play a nutritional role while the long ones play a reproductive one. These differences are reflected in the breeding system. Moreover, differential fertility and enantiostyly may diminish the effects of self-compatibility by partially reducing the contribution of geitonogamy to selfing.
Cecilia Laporta
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Revista de biología tropical     Volume:  53     ISSN:  0034-7744     ISO Abbreviation:  Rev. Biol. Trop.     Publication Date:    2005 Mar-Jun
Date Detail:
Created Date:  2007-03-14     Completed Date:  2007-08-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404267     Medline TA:  Rev Biol Trop     Country:  Costa Rica    
Other Details:
Languages:  eng     Pagination:  49-61     Citation Subset:  IM    
Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Lab. Plantas Vasculares. Pab. 2. 4 piso. Ciudad Universitaria, 1428, Buenos Aires, Argentina.
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MeSH Terms
Bees / physiology
Cassia / anatomy & histology,  physiology*
Fertilization / physiology
Flowers / anatomy & histology,  physiology*
Germination / physiology
Pollen / physiology
Reproduction / physiology
Senna Plant / anatomy & histology,  physiology*

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