Anatomical studies of the secretory structures: Glandular trichomes and ducts, in Grindelia pulchella Dunal (Astereae, Asteraceae)

Bartoli, Adriana; Galati, Beatriz Gloria; Tortosa, Roberto D.

doi:10.1016/j.flora.2011.07.012

Cited by 29 publications

(25 citation statements)

References 19 publications

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“…The observed striking difference, in addition to their differences in gland secretion compositions as observed in the present, may be involved in These unexpected results between two species that do not share populations [4], pose the question of whether the increased number of trichomes may be involved in organ-specific functions that may be relevant for their corresponding adaptations through habitat specialization [6]. The ultrastructure of the head cells of glandular trichomes revealed components typically found in cellular structures that produce and secrete metabolites [29] [55], although some glandular trichomes in Asteraceae only present smooth endoplasmic reticulum [28]. More specifically, the presence of abundant chloroplasts with visible starch grains in FC and FO is indicative of their functionality.…”

Section: Discussionmentioning

confidence: 77%

“…According to Herrero and Dickinson [75], the cell wall ingrowths associated to the plasmodesmata assures a great efficiency in the cellular exchange. Bartoli et al [29] also described the presence of a special tissue associated to secretory ducts in Grindelia pulchella (Asteraceae).…”

Section: Discussionmentioning

confidence: 99%

“…Biseriate glandular trichomes are typically found in Asteraceae, in different tribes and genera, such as Ambrosia trifida [44], Helianthus annuus [45] [46], Sigesbeckia jorullensis [41], Grindelia pulchella/Heliantheae [29], Centrapalus pauciflorus and Chrysolaena spp./Vernonieae [28] [47], respectively, Helichrysum [48] and Inula/Inuleae [49], Artemisia annua [50] and Tanacetum cinerariifolium/Anthemideae [51].…”

Section: Discussionmentioning

confidence: 99%

“…A high density of glandular trichomes, together with the presence of secretory ducts, was revealed by light microscopic observations in leaves and stems of FC and FO [36] [37], and of other Flourensia species (F. hirta, F. leptopoda, F. nierderleinii and F. tortuosa) [38]. However, data of secretory structures in flowers of Flourensia, as well as ultrastructural studies, are not available for the genus, and are still limited in the Asteraceae [29] [39] [40] [41].…”

Section: Introductionmentioning

confidence: 99%

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Secretory Structures in Flourensia campestris and F. oolepis: Ultrastructure, Distribution, and (-)-Hamanasic Acid A Secretion

Silva¹,

Tourn²,

López³

et al. 2015

AJPS

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In this work, the localization, density, morphology and ultrastructure of secretory structures in aerial organs of Flourensia campestris (FC) and F. oolepis (FO) (Asteraceae) by means of a combination of light, fluorescence, transmission (TEM) and scanning electron microscopy (SEM) were examined. The possible role of secretory structures in the production and secretion of the phytotoxic sesquiterpene (-)-hamanasic acid A ((-)HAA) in both species was also assessed. Capitate glandular trichomes were found in all reproductive organs of FC and FO, and were being reported for the first time. These glandular trichomes, typically associated to edges and veins, were of the same type as those already described for vegetative organs, and were abundant in involucral bracts and corolla of tubulose and ligulate flowers. Their density in reproductive organs of both species was similar (ca. 30/mm 2 ) and lower than that found in leaves (ca. 100/mm 2 ) and stems (ca. 160/mm 2 in FC, and up to 650/mm 2 in FO). Glandular trichomes in vegetative organs followed a species-* Corresponding authors. M. P. Silva et al. 926specific pattern of distribution. TEM and SEM observations suggest that each species differs in the way in which secretory materials are released to the outside: through cracks or pores in FC, or through a loose cuticle in FO. Similar inspections of the secretory ducts revealed lipophilic vacuoles localized in subepithelial and epithelial cells, in which secretions accumulated before being transferred to the duct. The presence of wall ingrowths in subepithelial cells suggests that granulocrine secretion operates in these species. Secretory ducts varied in density and diameter among the organs in both species, with the combination being maximal in woody stems. (-)HAA was only detected in surface secreted resins of both species, and its concentration (2D-TLC, GC-FID) was intimately associated with the distribution and density of glandular trichomes in each organ (capitula, leaves, and stems with primary or secondary growth). In addition, no (-)HAA was detected internally in the resins collected from secretory ducts. The composition of these resins showed distinctive profiles for FC and FO, and only four from ca. 30 compounds detected (GC/MS) were shared by both species. In addition to the elucidation of ultrastructural traits, distribution and density of secretory structures in aerial organs of FC and FO, present findings suggest a functional role for glandular trichomes in the secretion of the putative phytotoxic allelochemical (-)HAA.

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Section: Discussionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Secretory Structures in Flourensia campestris and F. oolepis: Ultrastructure, Distribution, and (-)-Hamanasic Acid A Secretion

Silva¹,

Tourn²,

López³

et al. 2015

AJPS

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“…In the leaf blade of all analyzed species, presence of secretory ducts was noted above the phloem of the main vein and in some larger lateral bundles. In Asteraceae, essential oils, lipids, resins, sesquiterpene lactones, alkaloids, pectin‐like substances, tannins and flavonoids are the main secretion products of ducts and glands (Bartoli et al ). While large oil bodies were easily observed in all examined species, their fine‐grained structure clearly distinguishes T. pannonicum from the other analyzed species.…”

Section: Discussionmentioning

confidence: 99%

Taxonomic status of Aster, Galatella and Tripolium (Asteraceae) in view of anatomical and micro‐morphological evidence

Karanović

Luković

Zorić

et al. 2015

Nordic Journal of Botany

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Using light and scanning electron microscopy (SEM), comparative analyses of anatomical and micro‐morphological characteristics of the leaf, stem and peduncle have been carried out on five species of the family Asteraceae (Aster amellus, Galatella linosyris, G. cana, G. sedifolia and Tripolium pannonicum), previously included in Aster although more recent morphological and phylogenetic studies indicate that Galatella and Tripolium should be considered as separate genera. The aim of the present study was to establish whether these species could be differentiated by anatomical characters. Our results will further inform the decision to separate the four aforementioned species from the genus Aster, as well as indicate whether anatomical data confirm the proposed circumscription of the genera Galatella and Tripolium. The anatomical observations and data analyses using discriminant and correspondence analysis showed that the combination of selected qualitative and quantitative characters separated the species into three groups, corresponding to the three genera. The characters of the leaf blade, its epidermis in particular, proved to be of the highest significance for discrimination at generic rank. The specific qualitative features that characterize each of the species and the genera were emphasized. Our findings support the attribution of the examined species to three genera, which proved to be anatomically distinguishable and well defined.

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Research Progress on the Resin Canal and Raw Lacquer Synthesis of Toxicodendron vernicifluum (Stokes) F.A. Barkley

Zhao¹

2019

Reference Series in Phytochemistry

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Anatomical studies of the secretory structures: Glandular trichomes and ducts, in Grindelia pulchella Dunal (Astereae, Asteraceae)

Cited by 29 publications

References 19 publications

Secretory Structures in <i>Flourensia campestris</i> and <i>F. oolepis</i>: Ultrastructure, Distribution, and (-)-Hamanasic Acid A Secretion

Secretory Structures in <i>Flourensia campestris</i> and <i>F. oolepis</i>: Ultrastructure, Distribution, and (-)-Hamanasic Acid A Secretion

Taxonomic status of Aster, Galatella and Tripolium (Asteraceae) in view of anatomical and micro‐morphological evidence

Research Progress on the Resin Canal and Raw Lacquer Synthesis of Toxicodendron vernicifluum (Stokes) F.A. Barkley

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Anatomical studies of the secretory structures: Glandular trichomes and ducts, in Grindelia pulchella Dunal (Astereae, Asteraceae)

Cited by 29 publications

References 19 publications

Secretory Structures in &lt;i&gt;Flourensia campestris&lt;/i&gt; and &lt;i&gt;F. oolepis&lt;/i&gt;: Ultrastructure, Distribution, and (-)-Hamanasic Acid A Secretion

Secretory Structures in &lt;i&gt;Flourensia campestris&lt;/i&gt; and &lt;i&gt;F. oolepis&lt;/i&gt;: Ultrastructure, Distribution, and (-)-Hamanasic Acid A Secretion

Taxonomic status of Aster, Galatella and Tripolium (Asteraceae) in view of anatomical and micro‐morphological evidence

Research Progress on the Resin Canal and Raw Lacquer Synthesis of Toxicodendron vernicifluum (Stokes) F.A. Barkley

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Secretory Structures in <i>Flourensia campestris</i> and <i>F. oolepis</i>: Ultrastructure, Distribution, and (-)-Hamanasic Acid A Secretion

Secretory Structures in <i>Flourensia campestris</i> and <i>F. oolepis</i>: Ultrastructure, Distribution, and (-)-Hamanasic Acid A Secretion