Ecdysteroids in spinach (Spinacia oleracea L.): Biosynthesis, transport and regulation of levels

Bakrim, Ahmed; Maria, Annick; Sayah, Fouad; Lafont, René; Takvorian, Najat

doi:10.1016/j.plaphy.2008.06.002

Cited by 51 publications

(50 citation statements)

References 38 publications

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“…2B), the precise sites of its biosynthesis (sources) and accumulation (sink) in Pfaffia glomerata remain unknown. In spinach, 20E may be biosynthesized in older leaves (sources) and translocated to young leaves (sink) where it may be accumulated (Bakrim et al, 2008).…”

Section: ��mentioning

confidence: 99%

Level and distribution of 20-hydroxyecdysone during Pfaffia glomerata development

Festucci-Buselli

Contim

Barbosa

et al. 2008

Braz. J. Plant Physiol.

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The ecdysteroid 20-hydroxyecdysone (20E) is a steroid hormone found in insects and few plants. To analyze its temporal and spatial distribution in Pfaffia glomerata (Amaranthaceae), we selected among 71 accessions, the accession 13 which showed the highest root 20E total quantity (1.48 g/plant root). The 20E was constantly detected in flowers, leaves, stems, and roots, but its percentage was variable throughout its development. The highest 20E percentage was found in flowers (0.82%), roots (0.66%), leaves (0.60%), and stems (0.24%). While stems showed the least variable 20E percentage (0.13% -0.24%), followed by roots (0.42% -0.66%), and flowers (0.47% -0.82%). Leaves showed the greatest 20E percentage variation (0.21% -0.60%). The stem and leaves 20E total amount remained constant, showing a little variation while root 20E total amount increased over time, suggesting that 20E may be accumulated in roots. These findings suggest that 20E has tissue specific functions in plant and may have ecological significance since uncoordinated pulses of 20E are often lethal to insects.

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Section: ��mentioning

confidence: 99%

Level and distribution of 20-hydroxyecdysone during Pfaffia glomerata development

Festucci-Buselli

Contim

Barbosa

et al. 2008

Braz. J. Plant Physiol.

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“…It is known that PEs in spinach are continuously redistributed to the aerial parts and accumulated to the highest concentration in the aerial and root tips. 13,17) Labeling experiments with the excised leaves and the plants, lacking source or sink organs of spinach, have provided the interesting information: i) Old leaf set is the biosynthetic source. ii) Young leaf set is the accumulative sink.…”

Section: Discussionmentioning

confidence: 99%

“…iii) Young leaf possess several active enzymes involved in the late biosynthetic step, although they do not perform the whole metabolic pathway. 8,13) In view of these reports, it was expected that the leaves of A. japonica at the reproductive stage synthesize 20E, and these compound are continuously redistributed in the aerial parts and accumulated to the highest concentration in both the spike and the flower. However, the results obtained from the incorporation study with [2-14 C]-MVA contradict this idea.…”

Section: Discussionmentioning

confidence: 99%

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Distribution and Biosynthesis of 20-Hydroxyecdysone in Plants ofAchyranthes japonicaNakai

Boo

Lee

Jeon

et al. 2010

Bioscience, Biotechnology, and Biochemistry

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“…Thus, this observation raises doubts about the pivotal role of MVA in the plant sterol pathway. However, the only studies to date on biosynthesis of PEs have been based on labelling experiments with 14 C-mevalonic acid (Grebenok and Adler 1993;Bakrim et al 2008). Thus, knowledge of PE biosynthesis is limited to parts mediated via the cytosolic sterol synthesis pathway.…”

Section: Biosynthesis Of Phytoecdysteroidsmentioning

confidence: 99%

Plant ecdysteroids: plant sterols with intriguing distributions, biological effects and relations to plant hormones

Tarkowská

Strnad

2016

Planta

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The present review summarises current knowledge of phytoecdysteroids' biosynthesis, distribution within plants, biological importance and relations to plant hormones. Plant ecdysteroids (phytoecdysteroids) are natural polyhydroxylated compounds that have a four-ringed skeleton, usually composed of either 27 carbon atoms or 28-29 carbon atoms (biosynthetically derived from cholesterol or other plant sterols, respectively). Their physiological roles in plants have not yet been confirmed and their occurrence is not universal. Nevertheless, they are present at high concentrations in various plant species, including commonly consumed vegetables, and have a broad spectrum of pharmacological and medicinal properties in mammals, including hepatoprotective and hypoglycaemic effects, and anabolic effects on skeletal muscle, without androgenic side-effects. Furthermore, phytoecdysteroids can enhance stress resistance by promoting vitality and enhancing physical performance; thus, they are considered adaptogens. This review summarises current knowledge of phytoecdysteroids' biosynthesis, distribution within plants, biological importance and relations to plant hormones.

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Ecdysteroids in spinach (Spinacia oleracea L.): Biosynthesis, transport and regulation of levels

Cited by 51 publications

References 38 publications

Level and distribution of 20-hydroxyecdysone during Pfaffia glomerata development

Level and distribution of 20-hydroxyecdysone during Pfaffia glomerata development

Distribution and Biosynthesis of 20-Hydroxyecdysone in Plants ofAchyranthes japonicaNakai

Plant ecdysteroids: plant sterols with intriguing distributions, biological effects and relations to plant hormones

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