Are stem nectaries common in Gentianaceae Juss.?
ABSTRACT Extrafloral nectaries (EFNs) are specialized structures that produce and release nectar and are located on leaves, cotyledons and, more seldomly, stems. Peculiar leaf nectaries have been described for thirty-three Neotropical species of Gentianaceae, while stem nectaries have been reported...
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| Format: | Article |
| Language: | English |
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Sociedade Botânica do Brasil
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| Series: | Acta Botânica Brasílica |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017005002107&lng=en&tlng=en |
| _version_ | 1818016116435320832 |
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| author | Valdnéa Casagrande Dalvi Renata Maria Strozi Alves Meira Aristéa Alves Azevedo |
| author_facet | Valdnéa Casagrande Dalvi Renata Maria Strozi Alves Meira Aristéa Alves Azevedo |
| author_sort | Valdnéa Casagrande Dalvi |
| collection | DOAJ |
| description | ABSTRACT Extrafloral nectaries (EFNs) are specialized structures that produce and release nectar and are located on leaves, cotyledons and, more seldomly, stems. Peculiar leaf nectaries have been described for thirty-three Neotropical species of Gentianaceae, while stem nectaries have been reported for only nine. The aim of this study was to verify the occurrence of stem EFNs within Gentianaceae and investigate the existence of a correlation between their occurrence and the geographical distribution of species. Samples of internodal regions from field and herbarium specimens were submitted to standard light microscopy techniques. Data regarding the geographical distribution of species were acquired from herbarium specimens and the literature. A total of 37 species were investigated, representing 25 genera distributed among five tribes. Nectaries, composed of modified epidermal cells, were observed in 16 species restricted to the Neotropical tribes Helieae, Saccifolieae, Potalieae and Coutoubeinae; exceptions were Cicendia quadrangularis and Zygostigma australe, which both occur in the Neotropics but do not possess EFNs. These results demonstrate that stem EFNs are common among Neotropical taxa of Gentianaceae, and are typically absent from taxa in temperate regions. |
| first_indexed | 2024-04-14T07:07:37Z |
| format | Article |
| id | doaj.art-fae5e7a99eaf42e1934669ca71b38a94 |
| institution | Directory Open Access Journal |
| issn | 1677-941X |
| language | English |
| last_indexed | 2024-04-14T07:07:37Z |
| publisher | Sociedade Botânica do Brasil |
| record_format | Article |
| series | Acta Botânica Brasílica |
| spelling | doaj.art-fae5e7a99eaf42e1934669ca71b38a942022-12-22T02:06:31ZengSociedade Botânica do BrasilActa Botânica Brasílica1677-941X010.1590/0102-33062016abb0404S0102-33062017005002107Are stem nectaries common in Gentianaceae Juss.?Valdnéa Casagrande DalviRenata Maria Strozi Alves MeiraAristéa Alves AzevedoABSTRACT Extrafloral nectaries (EFNs) are specialized structures that produce and release nectar and are located on leaves, cotyledons and, more seldomly, stems. Peculiar leaf nectaries have been described for thirty-three Neotropical species of Gentianaceae, while stem nectaries have been reported for only nine. The aim of this study was to verify the occurrence of stem EFNs within Gentianaceae and investigate the existence of a correlation between their occurrence and the geographical distribution of species. Samples of internodal regions from field and herbarium specimens were submitted to standard light microscopy techniques. Data regarding the geographical distribution of species were acquired from herbarium specimens and the literature. A total of 37 species were investigated, representing 25 genera distributed among five tribes. Nectaries, composed of modified epidermal cells, were observed in 16 species restricted to the Neotropical tribes Helieae, Saccifolieae, Potalieae and Coutoubeinae; exceptions were Cicendia quadrangularis and Zygostigma australe, which both occur in the Neotropics but do not possess EFNs. These results demonstrate that stem EFNs are common among Neotropical taxa of Gentianaceae, and are typically absent from taxa in temperate regions.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017005002107&lng=en&tlng=enCoutoubeinaeHelieaePotalieaeSaccifolieaesecretory structures |
| spellingShingle | Valdnéa Casagrande Dalvi Renata Maria Strozi Alves Meira Aristéa Alves Azevedo Are stem nectaries common in Gentianaceae Juss.? Acta Botânica Brasílica Coutoubeinae Helieae Potalieae Saccifolieae secretory structures |
| title | Are stem nectaries common in Gentianaceae Juss.? |
| title_full | Are stem nectaries common in Gentianaceae Juss.? |
| title_fullStr | Are stem nectaries common in Gentianaceae Juss.? |
| title_full_unstemmed | Are stem nectaries common in Gentianaceae Juss.? |
| title_short | Are stem nectaries common in Gentianaceae Juss.? |
| title_sort | are stem nectaries common in gentianaceae juss |
| topic | Coutoubeinae Helieae Potalieae Saccifolieae secretory structures |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017005002107&lng=en&tlng=en |
| work_keys_str_mv | AT valdneacasagrandedalvi arestemnectariescommoningentianaceaejuss AT renatamariastrozialvesmeira arestemnectariescommoningentianaceaejuss AT aristeaalvesazevedo arestemnectariescommoningentianaceaejuss |