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Occurrence and structure of extrafloral nectariesin Pterodon pubescens Benth. and Pterodon polygalaeflorus Benth.

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dc.creator Paiva Élder Antônio Sousa e
dc.creator Morais Helena Castanheira de
dc.creator Isaias Rosy Mary dos Santos
dc.creator Rocha Dulce Maria Sucena da
dc.creator Oliveira Paulo Eugênio
dc.date 2001
dc.date.accessioned 2013-05-30T02:43:07Z
dc.date.available 2013-05-30T02:43:07Z
dc.date.issued 2013-05-30
dc.identifier http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2001000200002
dc.identifier http://www.doaj.org/doaj?func=openurl&genre=article&issn=0100204X&date=2001&volume=36&issue=2&spage=219
dc.identifier.uri http://koha.mediu.edu.my:8181/jspui/handle/123456789/3550
dc.description Extrafloral nectaries (EFNs) are structurally variable and widely spread among the angiosperms. The occurrence of EFNs in leaves of Pterodon polygalaeflorus Benth. and Pterodon pubescens Benth. (Fabaceae: Papilionoideae) were detected in adult specimens, at the time of production of new buds and flowers. The goals of the present study are to register the occurrence of the EFNs in P. pubescens and P. polygalaeflorus, and provide comparative data on the anatomical structures. The EFNs occur in the rachis and are located under the insertion of each petiolule. Each nectary consists of a small elevation whose apical portion is deeply invaginated, resulting in a depression (secretory pole), a common characteristic of both species. Unicellular, nonglandular trichomes occur along the rachis, being less numerous in P. polygalaeflorus while in P. pubescens they cover the EFNs. The secretory tissue consists of parenchyma cells with dense cytoplasm compactly arranged. The nectar reaches the surface of the EFNs by rupturing the thin cuticle which covers the secretory pole, since both species lack stomata or any other interruption at the epidermis. The basic difference between the two species, in relation to the EFNs, is the density of the pubescence, which is always greater in P. pubescens. Structural and dimensional modifications may be observed, even between basal and apical nectaries in the same rachis, so it does not constitute a taxonomical tool.
dc.publisher Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
dc.source Pesquisa Agropecuária Brasileira
dc.subject nectaries
dc.subject plant anatomy
dc.subject plant secretions
dc.subject nectar
dc.subject plant protection
dc.subject herbivores
dc.subject plant animal relations
dc.title Occurrence and structure of extrafloral nectariesin Pterodon pubescens Benth. and Pterodon polygalaeflorus Benth.

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