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Article ; Online: Oil and mucilage idioblasts co-occur in the vegetative organs of Ocotea pulchella (Lauraceae): comparative development, ultrastructure and secretions.

de Deus Bento, Karla Bianca / Canaveze, Yve / Machado, Silvia Rodrigues

2024

Abstract: This study compares oil and mucilage idioblasts occurring together in the vegetative organs of Ocotea pulchella, a Lauraceae species. Our focus is specifically on the ontogeny and developmental cytology of these secretory cells. Both types of idioblasts ... ...

Abstract	This study compares oil and mucilage idioblasts occurring together in the vegetative organs of Ocotea pulchella, a Lauraceae species. Our focus is specifically on the ontogeny and developmental cytology of these secretory cells. Both types of idioblasts originate from solitary cells located in the fundamental meristem, underlying the protodermis. The growth of both types of idioblasts is asynchronous, with the oil idioblasts developing first, but their initiation is restricted to the early stages of organ development. Mucilaginous idioblasts occur exclusively in the palisade parenchyma, while oil idioblasts are scattered throughout the mesophyll, midrib, and petiole of the leaves. The lamellar secretion of mucilage idioblasts is mostly made up of polysaccharides, while the secretion of oil idioblasts is made up of terpenes and lipids. Cupule occurred only in the oil idioblasts, while suberized layers occurred in both types of cells. We found that immature oil idioblasts that are close to each other fuse; mature mucilage idioblasts have labyrinthine walls arranged in a reticulate pattern; the cells close to the oil idioblasts have a pectin protective layer; and the oil idioblasts have a sheath of phenolic cells. In contrast to previous reports, the two types of secretory idioblasts were recognized during the early stages of their development. The results emphasize the importance of combining optical and electron microscopy methods to observe the ontogenetic, histochemical and ultrastructural changes that occur during the development of the secretory idioblasts. This can help us understand how secreting cells store their secretions and how their walls become specialized.
Language	English
Publishing date	2024-03-14
Publishing country	Austria
Document type	Journal Article
ZDB-ID	123809-7
ISSN	1615-6102 ; 0033-183X
ISSN (online)	1615-6102
ISSN	0033-183X
DOI	10.1007/s00709-024-01942-1
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Article ; Online: Anatomical, histochemical, and developmental approaches reveal the long-term functioning of the floral nectary in Tocoyena formosa (Rubiaceae).

Izquierdo, Juliana V / Canaveze, Yve / Machado, Silvia Rodrigues / Amorim, Felipe W

Die Naturwissenschaften

2024 Volume 111, Issue 3, Page(s) 25

Abstract: Tocoyena formosa has a persistent floral nectary that continues producing nectar throughout flower and fruit development. This plant also presents an intriguing non-anthetic nectary derived from early-developing floral buds with premature abscised ... ...

Abstract	Tocoyena formosa has a persistent floral nectary that continues producing nectar throughout flower and fruit development. This plant also presents an intriguing non-anthetic nectary derived from early-developing floral buds with premature abscised corolla. In this study, we characterize the structure, morphological changes, and functioning of T. formosa floral nectary at different developmental stages. We subdivided the nectary into four categories based on the floral and fruit development stage at which nectar production started: (i) non-anthetic nectary; (ii) anthetic nectary, which follows the regular floral development; (iii) pericarpial nectary, derived from pollinated flowers following fruit development; and (iv) post-anthetic nectary that results from non-pollinated flowers after anthesis. The nectary has a uniseriate epidermis with stomata, nectariferous parenchyma, and vascular bundles, with a predominating phloem at the periphery. The non-anthetic nectary presents immature tissues that release the exudate. The nectary progressively becomes more rigid as the flower and fruit develop. The main nectary changes during flower and fruit development comprised the thickening of the cuticle and epidermal cell walls, formation of cuticular epithelium, and an increase in the abundance of calcium oxalate crystals and phenolic cells near the vascular bundles. Projections of the outer periclinal walls toward the cuticle in the post-anthetic nectary suggest nectar reabsorption. The anatomical changes of the nectary allow it to function for an extended period throughout floral and fruit development. Hence, T. formosa nectary is a bivalent secretory structure that plays a crucial role in the reproductive and defensive interactions of this plant species.
MeSH term(s)	Flowers/anatomy & histology ; Flowers/growth & development ; Plant Nectar ; Rubiaceae/anatomy & histology ; Rubiaceae/growth & development ; Rubiaceae/physiology ; Fruit/growth & development ; Fruit/anatomy & histology
Chemical Substances	Plant Nectar
Language	English
Publishing date	2024-04-22
Publishing country	Germany
Document type	Journal Article
ZDB-ID	123257-5
ISSN	1432-1904 ; 0028-1042
ISSN (online)	1432-1904
ISSN	0028-1042
DOI	10.1007/s00114-024-01909-5
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Article ; Online: Apoplasmic barrier in the extrafloral nectary of Citharexylum myrianthum (Verbenaceae).

Machado, Silvia Rodrigues / Rodrigues, Tatiane Maria

Planta

2021 Volume 254, Issue 2, Page(s) 19

Abstract: Main conclusion: The cytological changes underlying the formation of an apoplasmic barrier in the multi-layered extrafloral nectaries of Citharexylum myrianthum are compatible with the synthesis, transport and deposition of suberin. In terms of ... ...

Abstract	Main conclusion: The cytological changes underlying the formation of an apoplasmic barrier in the multi-layered extrafloral nectaries of Citharexylum myrianthum are compatible with the synthesis, transport and deposition of suberin. In terms of ontogenesis and function, the intermediate layers of these nectaries are homologous with the stalks of nectar-secreting trichomes. Anticlinal cell wall impregnations are common in trichomatic nectaries and their functions as endodermis-like barriers have been discussed because of possible direct effects on the nectary physiology, mainly in the nectar secretion and resorption. However, the cytological events linked to nectary wall impregnations remain little explored. This study documents the ontogenesis and the fine structure of the EFN cells, and cytological events linked to the wall impregnations of multi-layered extrafloral nectaries (EFNs) in Citharexylum myrianthum Cham. (Verbenaceae). EFNs are patelliform, and differentiated into (a) a multicellular foot, which is compound in structure and vascularised with phloem strands, (b) a bi-layered intermediate region with thickened cell walls and (c) a single-layered secretory region with palisade-like cells. EFNs are protodermal in origin, starting with a single protodermal cell and ending with the complex, multi-layered structure. The cell wall impregnations first appear in the very young EFN and increase towards maturity. Lipid patches (assumed to be suberin) are deposited on the inner faces of the primary walls, first along the anticlinal walls and then extend to the periclinal walls. On both walls, plasmodesmata remain apparently intact during the maturation of the EFNs. In the peripheral cytoplasm there are abundant polymorphic plastids, well-developed Golgi bodies often close to rough endoplasmic reticulum profiles, mitochondria and polyribosomes. Cytological events linked to the wall impregnations are consistent with suberin synthesis, transport and deposition. Our findings offer new insights into the structure-properties of specialised nectary cell walls and so should contribute to our knowledge of the physiological and protective roles of this structure in nectar glands.
MeSH term(s)	Biological Transport ; Cell Wall ; Plant Nectar ; Trichomes ; Verbenaceae
Chemical Substances	Plant Nectar
Language	English
Publishing date	2021-07-03
Publishing country	Germany
Document type	Journal Article
ZDB-ID	208909-9
ISSN	1432-2048 ; 0032-0935 ; 1866-2749
ISSN (online)	1432-2048
ISSN	0032-0935 ; 1866-2749
DOI	10.1007/s00425-021-03663-8
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Article ; Online: Lip morphology and ultrastructure of osmophores in Cyclopogon (Orchidaceae) reveal a degree of morphological differentiation among species.

Adachi, Sérgio Akira / Machado, Silvia Rodrigues

Protoplasma

2020 Volume 257, Issue 4, Page(s) 1139–1148

Abstract: Floral fragrances play an important role in pollinator attraction; they serve as signals for primary rewards such as nectar. The presence of osmophores (a specialized glandular tissue that produces fragrance) in the terrestrial orchid Cyclopogon has only ...

Abstract	Floral fragrances play an important role in pollinator attraction; they serve as signals for primary rewards such as nectar. The presence of osmophores (a specialized glandular tissue that produces fragrance) in the terrestrial orchid Cyclopogon has only been described in a single species. There are fragrant and odorless species within this genus, but no data on the similarities or differences between them has been published. Here, we present new data on the lip morphology and ultrastructure from eight Cyclopogon species to better understand the mechanisms of pollinator attraction of this group. To achieve this goal, we used light, scanning, and transmission electron microscopy. Five out of eight species presented globular trichomes associated with fragrance production on the abaxial side of the labellum. Together with subepidermal cells, they compose the secretory tissue. Despite the absence of globular trichomes, C. apricus also presented cells associated with fragrance production. Lipid droplets, plastids containing plastoglobuli, and starch were indicators of secretory activity present in these species. This same pattern of fragrance production and release, associated with flower morphology, may result in the restriction of pollination by halictid bees.
MeSH term(s)	Animals ; Cell Differentiation ; Flowers/chemistry ; Orchidaceae/chemistry
Language	English
Publishing date	2020-03-15
Publishing country	Austria
Document type	Journal Article
ZDB-ID	123809-7
ISSN	1615-6102 ; 0033-183X
ISSN (online)	1615-6102
ISSN	0033-183X
DOI	10.1007/s00709-020-01499-9
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: The putative cannabinoid-secreting trichome of Trema micrantha (L.) Blume (Cannabaceae).

Teixeira, Simone Pádua / Nascimento, Isabel Cristina / Grejo, Marina Priolo / Leite, Viviane Gonçalves / Machado, Sílvia Rodrigues

Protoplasma

2023 Volume 261, Issue 3, Page(s) 463–475

Abstract: Trema, a genus of the popularly known Cannabaceae, has recently been the subject of cannabinoid bioprospection. T. micrantha is a tree with pharmacological potential widely used in folk medicine. It has two types of glandular trichomes, bulbous and ... ...

Abstract	Trema, a genus of the popularly known Cannabaceae, has recently been the subject of cannabinoid bioprospection. T. micrantha is a tree with pharmacological potential widely used in folk medicine. It has two types of glandular trichomes, bulbous and filiform, spread throughout the plant body. Considering the proximity of this species to Cannabis sativa and Trema orientalis, species containing cannabinoids, the glandular trichomes of T. micrantha are also expected to be related to the secretion of these compounds. Thus, this study aims to detail the morphology of secretory trichomes during the synthesis, storing and release of metabolites in T. micrantha. We tested the proposition that they could be a putative type of cannabinoid-secreting gland. Pistillate and staminate flowers and leaves were collected and processed for ontogenic, histochemical, and ultrastructural analyses. Both types of glandular trichomes originate from a protodermal cell. They are putative cannabinoid-secreting sites because: (1) terpene-phenols and, more specifically, cannabinoids were detected in situ; (2) their secretory subcellular apparatus is consistent with that found in C. sativa: modified plastids, polyribosomes, an extensive rough endoplasmic reticulum, and a moniliform smooth endoplasmic reticulum. Plastids and smooth endoplasmic reticulum are involved in the synthesis of terpenes, while the rough endoplasmic reticulum acts in the phenolic synthesis. These substances cross the plasma membrane by exocytosis and are released outside the trichome through cuticle pores. The study of the cell biology of the putative cannabinoid glands can promote the advancement of prospecting for natural products in plants.
MeSH term(s)	Cannabinoids/analysis ; Cannabinoids/chemistry ; Cannabinoids/metabolism ; Trema/metabolism ; Cannabaceae ; Trichomes/ultrastructure ; Cannabis/metabolism ; Terpenes/chemistry ; Plant Leaves/metabolism
Chemical Substances	Cannabinoids ; Terpenes
Language	English
Publishing date	2023-11-24
Publishing country	Austria
Document type	Journal Article
ZDB-ID	123809-7
ISSN	1615-6102 ; 0033-183X
ISSN (online)	1615-6102
ISSN	0033-183X
DOI	10.1007/s00709-023-01907-w
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Apoplasmic barrier in the extrafloral nectary of Citharexylum myrianthum (Verbenaceae)

Machado, Silvia Rodrigues / Rodrigues, Tatiane Maria

Planta. 2021 Aug., v. 254, no. 2

2021

Abstract: MAIN CONCLUSION: The cytological changes underlying the formation of an apoplasmic barrier in the multi-layered extrafloral nectaries of Citharexylum myrianthum are compatible with the synthesis, transport and deposition of suberin. In terms of ... ...

Abstract	MAIN CONCLUSION: The cytological changes underlying the formation of an apoplasmic barrier in the multi-layered extrafloral nectaries of Citharexylum myrianthum are compatible with the synthesis, transport and deposition of suberin. In terms of ontogenesis and function, the intermediate layers of these nectaries are homologous with the stalks of nectar-secreting trichomes. Anticlinal cell wall impregnations are common in trichomatic nectaries and their functions as endodermis-like barriers have been discussed because of possible direct effects on the nectary physiology, mainly in the nectar secretion and resorption. However, the cytological events linked to nectary wall impregnations remain little explored. This study documents the ontogenesis and the fine structure of the EFN cells, and cytological events linked to the wall impregnations of multi-layered extrafloral nectaries (EFNs) in Citharexylum myrianthum Cham. (Verbenaceae). EFNs are patelliform, and differentiated into (a) a multicellular foot, which is compound in structure and vascularised with phloem strands, (b) a bi-layered intermediate region with thickened cell walls and (c) a single-layered secretory region with palisade-like cells. EFNs are protodermal in origin, starting with a single protodermal cell and ending with the complex, multi-layered structure. The cell wall impregnations first appear in the very young EFN and increase towards maturity. Lipid patches (assumed to be suberin) are deposited on the inner faces of the primary walls, first along the anticlinal walls and then extend to the periclinal walls. On both walls, plasmodesmata remain apparently intact during the maturation of the EFNs. In the peripheral cytoplasm there are abundant polymorphic plastids, well-developed Golgi bodies often close to rough endoplasmic reticulum profiles, mitochondria and polyribosomes. Cytological events linked to the wall impregnations are consistent with suberin synthesis, transport and deposition. Our findings offer new insights into the structure-properties of specialised nectary cell walls and so should contribute to our knowledge of the physiological and protective roles of this structure in nectar glands.
Keywords	Verbenaceae ; cell walls ; lipids ; mitochondria ; nectar ; nectar secretion ; nectaries ; ontogeny ; phloem ; plasmodesmata ; plastids ; polyribosomes ; resorption ; rough endoplasmic reticulum ; suberin ; trichomes
Language	English
Dates of publication	2021-08
Size	p. 19.
Publishing place	Springer Berlin Heidelberg
Document type	Article
ZDB-ID	208909-9
ISSN	1432-2048 ; 0032-0935 ; 1866-2749
ISSN (online)	1432-2048
ISSN	0032-0935 ; 1866-2749
DOI	10.1007/s00425-021-03663-8
Database	NAL-Catalogue (AGRICOLA)

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Article: Adhesive secretion in Schizolobium parahyba (Vell.) Blake (Leguminosae: Caesalpinioideae): histochemical and morpho-functional characterization of this unusual feature in woody plants

Paiva, Elder Antônio Sousa / Oliveira, Denise Maria Trombert / Canaveze, Yve / Machado, Silvia Rodrigues

Arthropod-plant interactions. 2022 Apr., v. 16, no. 2

2022

Abstract: The legume tree Schizolobium parahyba from the Brazilian Atlantic Forest shows young aerial organs covered with a sticky exudate. Aiming to clarify the functional aspects of the sticky secretions, we performed analyses on the dynamics of secretion ... ...

Abstract	The legume tree Schizolobium parahyba from the Brazilian Atlantic Forest shows young aerial organs covered with a sticky exudate. Aiming to clarify the functional aspects of the sticky secretions, we performed analyses on the dynamics of secretion through the plant development and characterized the chemical nature of the exudates by histochemical tests. We also studied the secretory tissue using light and electron microscopy. The production of the exudates starts soon after seed germination, being evident in the epicotyl but not in the hypocotyl and cotyledons. The secretory activity extends throughout the juvenile and pre-reproductive phase, in primary stems and leaf portions. After the first flowering, secretion was no longer observed. The lipid exudates are secreted by the epidermis and are composed of mixtures of essential oils and oleoresins. Modified plastids, extensive rough endoplasmic reticulum, proliferated smooth endoplasmic reticulum, enlarged vacuoles containing flocculant materials, membrane debris, and convoluted tubules/lamellae membranes covered with osmiophilic deposits are the main features of the secretory epidermal cells. Secretion exits the protoplast by exocytosis and accumulates in the cuticle, resulting in a sheath of concentric bands of electron-dense deposits, and is released by cuticle peeling. The hydrophobic nature of the secretion, which forms an impermeable layer on the epidermis of young organs, is a relevant attribute of the aerial organs of S. parahyba. In addition to protecting against desiccation, this exudate effectively captures particles and immobilizes insects and other arthropods.
Keywords	Schizolobium parahyba ; electron microscopy ; exocytosis ; flocculants ; forests ; hydrophobicity ; hypocotyls ; juveniles ; leaves ; legumes ; lipids ; oleoresins ; plastids ; protoplasts ; rough endoplasmic reticulum ; secretion ; seed germination ; smooth endoplasmic reticulum ; trees
Language	English
Dates of publication	2022-04
Size	p. 249-261.
Publishing place	Springer Netherlands
Document type	Article
ZDB-ID	2377469-1
ISSN	1872-8847 ; 1872-8855
ISSN (online)	1872-8847
ISSN	1872-8855
DOI	10.1007/s11829-022-09888-y
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Epicormic bud protection traits vary along a latitudinal gradient in a neotropical savanna.

de Campos, Bruna Helena / Guimarães, Elza / Canaveze, Yve / Machado, Silvia Rodrigues

Die Naturwissenschaften

2021 Volume 108, Issue 2, Page(s) 11

Abstract: Regrowth via production of epicormic shoots is an important strategy for many woody plants after environmental disturbances such as fire, drought, and herbivory. Populations spreading across a broad latitudinal gradient offer opportunities to investigate ...

Abstract	Regrowth via production of epicormic shoots is an important strategy for many woody plants after environmental disturbances such as fire, drought, and herbivory. Populations spreading across a broad latitudinal gradient offer opportunities to investigate if essential traits vary with heterogenous environmental conditions, such as in savanna ecosystems. This information can help us predict plant responses to climate change. Here, we evaluated if epicormic bud protection traits varied among populations of three focal savanna species (Miconia albicans, Solanum lycocarpum, and Zeyheria montana) that have a wide distribution and grow under variable climatic conditions. We randomly sampled 225 individuals over five spatially independent sites (7°, 10°, 15°, 18°, and 24° S) in Brazil, totaling 15 individuals per species per area. We analyzed anatomical transverse sections of five buds per species per area to assess the relative area occupied by crystal and phenolic idioblasts, the thickness of the trichome boundary layer, and to test if these traits were associated with climatic conditions. The buds were protected by cataphylls and composed of a variable number of undeveloped leaves enveloping the shoot apex. For M. albicans, we found an association between maximum temperature and both phenolic idioblasts and trichome boundary layer, but no association with crystal idioblasts. In S. lycocarpum, only the trichome boundary layer was associated with maximum temperature plus high radiation. Z. montana showed no variation. Combination of two or more traits can lead to the development of adaptative strategies to different climatic conditions. We present for the first time an analysis of epicormic bud traits in plant populations occurring in an extensive latitudinal gradient and shed light on how maximum temperature is associated with these traits, contributing to a better understanding of plant resprouting capabilities in widespread savanna plant species.
MeSH term(s)	Brazil ; Grassland ; Magnoliopsida/anatomy & histology ; Magnoliopsida/physiology ; Melastomataceae/anatomy & histology ; Melastomataceae/physiology ; Solanum/anatomy & histology ; Solanum/physiology ; Temperature ; Tropical Climate
Language	English
Publishing date	2021-03-19
Publishing country	Germany
Document type	Journal Article
ZDB-ID	123257-5
ISSN	1432-1904 ; 0028-1042
ISSN (online)	1432-1904
ISSN	0028-1042
DOI	10.1007/s00114-021-01722-4
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Ui VI 2855: Show issues			Location: Je nach Verfügbarkeit (siehe Angabe bei Bestand) bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular ab Jg. 2022: Lesesaal (EG)

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Article: Lip morphology and ultrastructure of osmophores in Cyclopogon (Orchidaceae) reveal a degree of morphological differentiation among species

Adachi, Sérgio Akira / Machado, Silvia Rodrigues

Protoplasma. 2020 July, v. 257, no. 4

2020

Abstract	Floral fragrances play an important role in pollinator attraction; they serve as signals for primary rewards such as nectar. The presence of osmophores (a specialized glandular tissue that produces fragrance) in the terrestrial orchid Cyclopogon has only been described in a single species. There are fragrant and odorless species within this genus, but no data on the similarities or differences between them has been published. Here, we present new data on the lip morphology and ultrastructure from eight Cyclopogon species to better understand the mechanisms of pollinator attraction of this group. To achieve this goal, we used light, scanning, and transmission electron microscopy. Five out of eight species presented globular trichomes associated with fragrance production on the abaxial side of the labellum. Together with subepidermal cells, they compose the secretory tissue. Despite the absence of globular trichomes, C. apricus also presented cells associated with fragrance production. Lipid droplets, plastids containing plastoglobuli, and starch were indicators of secretory activity present in these species. This same pattern of fragrance production and release, associated with flower morphology, may result in the restriction of pollination by halictid bees.
Keywords	Halictidae ; Orchidaceae ; bee pollination ; bees ; epidermis (plant) ; flower morphology ; insect attractants ; labellum (flowers) ; lipids ; nectar ; nectar secretion ; odors ; plant glands ; plastids ; pollinators ; starch ; trichomes ; ultrastructure
Language	English
Dates of publication	2020-07
Size	p. 1139-1148.
Publishing place	Springer Vienna
Document type	Article
Note	golden set
ZDB-ID	123809-7
ISSN	1615-6102 ; 0033-183X
ISSN (online)	1615-6102
ISSN	0033-183X
DOI	10.1007/s00709-020-01499-9
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Intraspecific variation in ultrastructure and secretion of the resin canals in Anacardium humile (Anacardiaceae).

de Carvalho, Shelly Favorito / Scudeler, Elton Luiz / Dos Santos, Daniela Carvalho / Machado, Silvia Rodrigues

Protoplasma

2022 Volume 260, Issue 3, Page(s) 919–934

Abstract: The study combines a range of light and electron microscopy methods to access variation in secretion and ultrastructure in the secretory canals in the above- and belowground stems of Anacardium humile, which here serves as a model system. The aboveground ...

Abstract	The study combines a range of light and electron microscopy methods to access variation in secretion and ultrastructure in the secretory canals in the above- and belowground stems of Anacardium humile, which here serves as a model system. The aboveground stem canals show epithelial cells with ultrastructural characteristics typical of cells active in secretion, while in the belowground stems, the subcellular characteristics are typical of cells with low rates of metabolism. The secretory canals of the belowground stems show uniformity in size and shape, a large central vacuole, a cytoplasm reduced to a thin layer at the cell periphery, and a reduced population of organelles. The aboveground stem canals had voluminous nuclei with evident nucleoli, a very dense cytoplasm with free ribosomes, polyribosomes, mitochondria with developed cristae, and ellipsoid plastids with electron-opaque droplets surrounded by a periplastid reticulum. The vacuoles were of different sizes and often had membranous contents and the dictyosomes were very developed with dilated ends to the cisternae, rough endoplasmic reticulum, and numerous vesicles. The results show that particularities in above- and belowground environment have significant implications for ultrastructural morphology and functioning of secretory canals in the stems of A. humile.
MeSH term(s)	Anacardium ; Anacardiaceae ; Microscopy, Electron ; Mitochondria/ultrastructure ; Ribosomes
Language	English
Publishing date	2022-11-30
Publishing country	Austria
Document type	Journal Article
ZDB-ID	123809-7
ISSN	1615-6102 ; 0033-183X
ISSN (online)	1615-6102
ISSN	0033-183X
DOI	10.1007/s00709-022-01823-5
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In stock of ZB MED Bonn / Germany

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Kategorien

In stock of ZB MED Cologne/Königswinter

Order via subito