Document Detail


Evolution of petal epidermal micromorphology in Leguminosae and its use as a marker of petal identity.
MedLine Citation:
PMID:  19789174     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND AND AIMS: The legume flower is highly variable in symmetry and differentiation of petal types. Most papilionoid flowers are zygomorphic with three types of petals: one dorsal, two lateral and two ventral petals. Mimosoids have radial flowers with reduced petals while caesalpinioids display a range from strongly zygomorphic to nearly radial symmetry. The aims are to characterize the petal micromorphology relative to flower morphology and evolution within the family and assess its use as a marker of petal identity (whether dorsal, lateral or ventral) as determined by the expression of developmental genes.
METHODS: Petals were analysed using the scanning electron microscope and light microscope. A total of 175 species were studied representing 26 tribes and 89 genera in all three subfamilies of the Leguminosae.
KEY RESULTS: The papilionoids have the highest degree of variation of epidermal types along the dorsiventral axis within the flower. In Loteae and genistoids, in particular, it is common for each petal type to have a different major epidermal micromorphology. Papillose conical cells are mainly found on dorsal and lateral petals. Tabular rugose cells are mainly found on lateral petals and tabular flat cells are found only in ventral petals. Caesalpinioids lack strong micromorphological variation along this axis and usually have only a single major epidermal type within a flower, although the type maybe either tabular rugose cells, papillose conical cells or papillose knobby rugose cells, depending on the species.
CONCLUSIONS: Strong micromorphological variation between different petals in the flower is exclusive to the subfamily Papilionoideae. Both major and minor epidermal types can be used as micromorphological markers of petal identity, at least in papilionoids, and they are important characters of flower evolution in the whole family. The molecular developmental pathway between specific epidermal micromorphology and the expression of petal identity genes has yet to be established.
Authors:
Isidro Ojeda; Javier Francisco-Ortega; Quentin C B Cronk
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-09-29
Journal Detail:
Title:  Annals of botany     Volume:  104     ISSN:  1095-8290     ISO Abbreviation:  Ann. Bot.     Publication Date:  2009 Nov 
Date Detail:
Created Date:  2009-10-23     Completed Date:  2009-12-30     Revised Date:  2013-05-31    
Medline Journal Info:
Nlm Unique ID:  0372347     Medline TA:  Ann Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  1099-110     Citation Subset:  IM    
Affiliation:
Department of Botany, University of British Columbia, 3529-6270 University Blvd, Vancouver, BC, Canada. isidro@interchange.ubc.ca
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MeSH Terms
Descriptor/Qualifier:
Biological Evolution*
Biological Markers / metabolism
Caesalpinia / anatomy & histology,  cytology,  ultrastructure
Fabaceae / anatomy & histology*,  cytology,  ultrastructure
Flowers / anatomy & histology*,  cytology,  ultrastructure
Indigofera / anatomy & histology,  cytology,  ultrastructure
Plant Epidermis / anatomy & histology*,  cytology,  ultrastructure
Chemical
Reg. No./Substance:
0/Biological Markers
Comments/Corrections

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