Morphological and anatomical traits during development: Highlighting extrafloral nectaries in Passiflora organensis.

Moraes, Tatiana S; Rossi, Mônica Lanzoni; Martinelli, Adriana P; Dornelas, Marcelo C

Moraes, Tatiana S; Rossi, Mônica Lanzoni; Martinelli, Adriana P; Dornelas, Marcelo C.

Afiliação

Moraes TS; Plant Biotechnology Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, Brazil.
Rossi ML; Plant Biotechnology Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, Brazil.
Martinelli AP; Plant Biotechnology Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, Brazil.
Dornelas MC; Department of Plant Biology, Institute of Biology, University of Campinas, Campinas, SP, Brazil.

Microsc Res Tech ; 85(8): 2784-2794, 2022 Aug.

Article em En | MEDLINE | ID: mdl-35421272

RESUMO

Passiflora organensis is a small herbaceous vine with characteristic morphological variations throughout its development. The plant bears button-shaped extrafloral nectaries exclusively in adult leaves. Extrafloral nectaries are structures that secrete nectar and play an important role in plant-animal interactions as a strategy for protecting plants against herbivory. In this work, we performed anatomical and ultrastructural studies to characterize P. organensis extrafloral nectaries during their secretory phase. We showed extrafloral nectaries in Passiflora organensis are composed of three distinct regions: nectary epidermis, nectariferous parenchyma, and subnectariferous parenchyma. Our data suggests that all nectary regions constitute a functional unit involved in nectar production and release. The high metabolic activity in the nectary cells is characterized by the juxtaposition of organelles such as mitochondria and plastids together plasmalemma. In addition, calcium oxalate crystals are frequently associated to the nectaries. An increasing concentration of calcium during leaf development and nectary differentiation was observed, corresponding to the calcium deposition as calcium oxalate crystals. This is the first description of extrafloral nectaries in Passiflora organensis that is a promising tropical model species for several studies. RESEARCH HIGHLIGHTS: The anatomical and ultrastructural characteristics and the presence of calcium oxalate crystals in the nectary tissue suggest novel strategies against herbivory in the genus Passiflora.

Assuntos

Passiflora; Néctar de Plantas; Animais; Cálcio; Oxalato de Cálcio; Passiflora/metabolismo; Néctar de Plantas/metabolismo; Plantas

Palavras-chave

calcium concentration; calcium oxalate crystals; druses; leaf morphology; nectary; passion fruit; shoot apical meristem

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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Passiflora / Néctar de Plantas Tipo de estudo: Prognostic_studies Limite: Animals Idioma: En Revista: Microsc Res Tech Assunto da revista: DIAGNOSTICO POR IMAGEM Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos

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