Data/hora: 01/06/2024 02:44:24

Biblioteca(s): | Embrapa Unidades Centrais.
Data corrente: | 11/05/2001
Data da última atualização: | 21/11/2018
Autoria: | PAIVA, E. A. S. e; MORAIS, H. C. de; ISAIAS, R. M. dos S.; ROCHA, D. M. S. de; OLIVEIRA, P. E.
Afiliação: | Élder Antônio Sousa e Paiva, Universidade Federal de Minas Gerais - UFMG/Departamento de Botânica; Helena Castanheira de Morais, Universidade de Brasília - UnB/Departamento de Ecologia; Rosy Mary dos Santos Isaias, Universidade Federal de Minas Gerais - UFMG/Departamento de Botânica; Dulce Maria Sucena da Rocha, Universidade de Brasília - UnB/Departamento de Ecologia; Paulo Eugênio Oliveira, Universidade Federal de Uberlândia - UFU Departamento de Biociências.
Título: | Ocurrence and structure of extrafloral nectaries in Pterodon pubescens Benth. and Pterodon polygalaeflorus Benth.
Ano de publicação: | 2001
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, DF, v. 36, n. 2, p. 219-224, fev. 2001
Idioma: | Inglês
Notas: | Título em português: Ocorrência e estrutura de nectários extraflorais em Pterodon pubescens Benth. e em Pterodon polygalaeflorus Benth.
Conteúdo: | 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, non-glandular 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.
Palavras-Chave: | Nectarios; Plant animal relations; Plant secretions; Proteção das plantas; Relação planta-animal; Secreção vegetal.
Thesagro: | Anatomia Vegetal; Animal Herbívoro; Néctar.
Thesaurus Nal: | Herbivores; Nectaries; Plant anatomy; Plant protection.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/18929/1/pab99_174.pdf
Registro original: | Embrapa Unidades Centrais (AI-SEDE)
Exemplares: | AI-SEDE - (18929-1) - UPE - AP - PP - 630.72081 - P474 - AP - DIS