Glandular trichomes in Connarus suberosus (Connaraceae): distribution, structural organization and probable functions
Connarus suberosus is a typical species of the Brazilian Cerrado biome, and its inflorescences and young vegetative branches are densely covered by dendritic trichomes. The objective of this study was to report the occurrence of a previously undescribed glandular trichome of this species. The locali...
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| Format: | Article |
| Language: | English |
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Vicerractoría Investigación
2012-03-01
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| Series: | Revista de Biología Tropical |
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| Online Access: | http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442012000100038&lng=en&tlng=en |
| _version_ | 1797721802490773504 |
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| author | João Donizete Denardi Denise Maria Trombert Oliveira Elder Antônio Sousa Paiva |
| author_facet | João Donizete Denardi Denise Maria Trombert Oliveira Elder Antônio Sousa Paiva |
| author_sort | João Donizete Denardi |
| collection | DOAJ |
| description | Connarus suberosus is a typical species of the Brazilian Cerrado biome, and its inflorescences and young vegetative branches are densely covered by dendritic trichomes. The objective of this study was to report the occurrence of a previously undescribed glandular trichome of this species. The localization, origin and structure of these trichomes were investigated under light, transmission and scanning electron microscopy. Collections were made throughout the year, from five adult specimens of Connarus suberosus near Botucatu, São Paulo, Brazil, including vegetative and reproductive apices, leaves and fruits in different developmental stages, as well as floral buds and flowers at anthesis. Glandular trichomes (GTs) occurred on vegetative and reproductive organs during their juvenile stages. The GTs consisted of a uniseriate, multicellular peduncle, whose cells contain phenolic compounds, as well as a multicellular glandular portion that accumulates lipids. The glandular cell has thin wall, dense cytoplasm (with many mitochondria, plastids and dictyosomes), and a large nucleus with a visible nucleolus. The starch present in the plastids was hydrolyzed during the synthesis phase, reducing the density of the plastid stroma. Some plastids were fused to vacuoles, and some evidence suggested the conversion of plastids into vacuoles. During the final activity stages of the GTs, a darkening of the protoplasm was observed in some of the glandular cells, as a programmed cell death; afterwards, became caducous. The GTs in C. suberosus had a temporal restriction, being limited to the juvenile phase of the organs. Their presence on the exposed surfaces of developing organs and the chemical nature of the reserve products, suggest that these structures are food bodies. Field observations and detailed studies of plant-environment interactions, as well as chemical analysis of the reserve compounds, are still necessary to confirm the role of these GTs as feeding rewards. |
| first_indexed | 2024-03-12T09:39:29Z |
| format | Article |
| id | doaj.art-c1612fa9428a4d87b78106172a9183a4 |
| institution | Directory Open Access Journal |
| issn | 0034-7744 |
| language | English |
| last_indexed | 2024-03-12T09:39:29Z |
| publishDate | 2012-03-01 |
| publisher | Vicerractoría Investigación |
| record_format | Article |
| series | Revista de Biología Tropical |
| spelling | doaj.art-c1612fa9428a4d87b78106172a9183a42023-09-02T13:23:57ZengVicerractoría InvestigaciónRevista de Biología Tropical0034-77442012-03-01601505513S0034-77442012000100038Glandular trichomes in Connarus suberosus (Connaraceae): distribution, structural organization and probable functionsJoão Donizete Denardi0Denise Maria Trombert Oliveira1Elder Antônio Sousa Paiva2Universidade Estadual de Mato Grosso do SulUniversidade Federal de Minas GeraisUniversidade Federal de Minas GeraisConnarus suberosus is a typical species of the Brazilian Cerrado biome, and its inflorescences and young vegetative branches are densely covered by dendritic trichomes. The objective of this study was to report the occurrence of a previously undescribed glandular trichome of this species. The localization, origin and structure of these trichomes were investigated under light, transmission and scanning electron microscopy. Collections were made throughout the year, from five adult specimens of Connarus suberosus near Botucatu, São Paulo, Brazil, including vegetative and reproductive apices, leaves and fruits in different developmental stages, as well as floral buds and flowers at anthesis. Glandular trichomes (GTs) occurred on vegetative and reproductive organs during their juvenile stages. The GTs consisted of a uniseriate, multicellular peduncle, whose cells contain phenolic compounds, as well as a multicellular glandular portion that accumulates lipids. The glandular cell has thin wall, dense cytoplasm (with many mitochondria, plastids and dictyosomes), and a large nucleus with a visible nucleolus. The starch present in the plastids was hydrolyzed during the synthesis phase, reducing the density of the plastid stroma. Some plastids were fused to vacuoles, and some evidence suggested the conversion of plastids into vacuoles. During the final activity stages of the GTs, a darkening of the protoplasm was observed in some of the glandular cells, as a programmed cell death; afterwards, became caducous. The GTs in C. suberosus had a temporal restriction, being limited to the juvenile phase of the organs. Their presence on the exposed surfaces of developing organs and the chemical nature of the reserve products, suggest that these structures are food bodies. Field observations and detailed studies of plant-environment interactions, as well as chemical analysis of the reserve compounds, are still necessary to confirm the role of these GTs as feeding rewards.http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442012000100038&lng=en&tlng=enSabanacuerpos alimenticiosinteracciones planta-hormigatricomaultraestructura celular |
| spellingShingle | João Donizete Denardi Denise Maria Trombert Oliveira Elder Antônio Sousa Paiva Glandular trichomes in Connarus suberosus (Connaraceae): distribution, structural organization and probable functions Revista de Biología Tropical Sabana cuerpos alimenticios interacciones planta-hormiga tricoma ultraestructura celular |
| title | Glandular trichomes in Connarus suberosus (Connaraceae): distribution, structural organization and probable functions |
| title_full | Glandular trichomes in Connarus suberosus (Connaraceae): distribution, structural organization and probable functions |
| title_fullStr | Glandular trichomes in Connarus suberosus (Connaraceae): distribution, structural organization and probable functions |
| title_full_unstemmed | Glandular trichomes in Connarus suberosus (Connaraceae): distribution, structural organization and probable functions |
| title_short | Glandular trichomes in Connarus suberosus (Connaraceae): distribution, structural organization and probable functions |
| title_sort | glandular trichomes in connarus suberosus connaraceae distribution structural organization and probable functions |
| topic | Sabana cuerpos alimenticios interacciones planta-hormiga tricoma ultraestructura celular |
| url | http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442012000100038&lng=en&tlng=en |
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