Linear glandular trichomes of Helianthus (Asteraceae): morphology, localization, metabolite activity and occurrence

Aschenbrenner, Anna-Katharina; Horakh, Silke; Spring, Otmar

doi:10.1093/aobpla/plt028

Cited by 47 publications

(38 citation statements)

References 28 publications

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“…There was a profusion of linear glandular trichomes and larger nonglandular trichomes (NGTs) on sunflower stems, petioles, and leaf blades (Supplemental Fig. S2, A and B; Aschenbrenner et al, 2013). Darkened NGTs were visible on petioles and leaves of sunflower plants 8 d after imposing the 100 mM Mn treatment (Supplemental Fig.…”

Section: Plant Growth and Mn Statusmentioning

confidence: 99%

Synchrotron-based Techniques Shed Light on Mechanisms of Plant Sensitivity and Tolerance to High Manganese in the Root Environment

et al. 2015

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Section: Plant Growth and Mn Statusmentioning

confidence: 99%

Synchrotron-based Techniques Shed Light on Mechanisms of Plant Sensitivity and Tolerance to High Manganese in the Root Environment

et al. 2015

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“…The latter have been previously described as non glandular trichomes for this species and F . oolepis , although they are strikingly similar to the uniseriate linear glandular trichomes found in Helianthus annus and other genera of the Heliantheae . The adaxial surface of F .…”

Section: Resultsmentioning

confidence: 99%

Volatiles and Nonvolatiles in Flourensia campestris Griseb. (Asteraceae), How Much Do Capitate Glandular Trichomes Matter?

Piazza

López

Silva

et al. 2018

Chemistry & Biodiversity

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The distribution and ultrastructure of capitate glandular trichomes (GTs) in Flourensia species (Asteraceae) have been recently elucidated, but their metabolic activity and potential biological function remain unexplored. Selective nonvolatile metabolites from isolated GTs were strikingly similar to those found on leaf surfaces. The phytotoxic allelochemical sesquiterpene (-)-hamanasic acid A ((-)-HAA) was the major constituent (ca. 40%) in GTs. Although GTs are quaternary ammonium compounds (QACs)-accumulating species, glycine betaine was not found in GTs; it was only present in the leaf mesophyll. Two (-)-HAA accompanying surface secreted products: compounds 4-hydroxyacetophenone (piceol; 1) and 2-hydroxy-5-methoxyacetophenone (2), which were isolated and fully characterized (GC/MS, NMR), were present in the volatiles found in GTs. The essential oils of fresh leaves revealed ca. 33% monoterpenes, 26% hydrocarbon- and 30% oxygenated sesquiterpenes, most of them related to cadinene and bisabolene derivatives. Present results suggest a main role of GTs in determining the volatile and nonvolatile composition of F. campestris leaves. Based on the known activities of the compounds identified, it can be suggested that GTs in F. campestris would play key ecological functions in plant-pathogen and plant-plant interactions. In addition, the strikingly high contribution of compounds derived from cadinene and bisabolene pathways, highlights the potential of this species as a source of high-valued bioproducts.

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“…; Aschenbrenner et al . , ; Amrehn et al . ), also occur for A. discolor and most likely other species of the subtribe Helianthinae.…”

Section: Discussionmentioning

confidence: 99%

Capitate glandular trichomes in Aldama discolor (Heliantheae – Asteraceae): morphology, metabolite profile and sesquiterpene biosynthesis

et al. 2015

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The capitate glandular trichome is the most common type described in Asteraceae species. It is known for its ability to produce various plant metabolites of ecological and economic importance, among which sesquiterpene lactones are predominant. In this paper, we applied microscopy, phytochemical and molecular genetics techniques to characterise the capitate glandular trichome in Aldama discolor, a native Brazilian species of Asteraceae, with pharmacological potential. It was found that formation of trichomes on leaf primordia of germinating seeds starts between 24 h and 48 h after radicle growth indicates germination. The start of metabolic activity of trichomes was indicated by separation of the cuticle from the cell wall of secretory cells at the trichome tip after 72 h. This coincided with the accumulation of budlein A, the major sesquiterpene lactone of A. discolor capitate glandular trichomes, in extracts of leaf primordia after 96 h. In the same timeframe of 72-96 h post-germination, gene expression studies showed up-regulation of the putative germacrene A synthase (pGAS2) and putative germacrene A oxidase (pGAO) of A. discolor in the transcriptome of these samples, indicating the start of sesquiterpene lactone biosynthesis. Sequencing of the two genes revealed high similarity to HaGAS and HaGAO from sunflower, which shows that key steps of this pathway are highly conserved. The processes of trichome differentiation, metabolic activity and genetic regulation in A. discolor and in sunflower appear to be typical for other species of the subtribe Helianthinae.

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Linear glandular trichomes of Helianthus (Asteraceae): morphology, localization, metabolite activity and occurrence

Cited by 47 publications

References 28 publications

Synchrotron-based Techniques Shed Light on Mechanisms of Plant Sensitivity and Tolerance to High Manganese in the Root Environment

Synchrotron-based Techniques Shed Light on Mechanisms of Plant Sensitivity and Tolerance to High Manganese in the Root Environment

Volatiles and Nonvolatiles in Flourensia campestris Griseb. (Asteraceae), How Much Do Capitate Glandular Trichomes Matter?

Capitate glandular trichomes in Aldama discolor (Heliantheae – Asteraceae): morphology, metabolite profile and sesquiterpene biosynthesis

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