Ontogenic variation of biologically active metabolites ofPteridium aquilinum (L. Kuhn) pterosins A and B, and ptaquiloside in a bracken population of the tropical andes

Alonso‐Amelot, Miguel E.; Pérez-Mena, Margarita; Calcagno, María Pia; Jaimes-Espinoza, Ramon; Castillo, Uvidelio

doi:10.1007/bf00994365

Cited by 27 publications

(13 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Research has been concentrated on the quantification of this compound in the plant (Alonso-Amelot et al, 1992;Rasmussen et al, 2003) and in biological samples, such as urine, milk and plasma (Aranha et al, 2014). Ptaquiloside is unstable due to the presence of a spirocyclopropane moiety.…”

Section: Introductionmentioning

confidence: 99%

Isolation and characterisation of 13 pterosins and pterosides from bracken (Pteridium aquilinum (L.) Kuhn) rhizome

et al. 2016

View full text Add to dashboard Cite

Thirteen previously undescribed pterosins and pterosides were isolated from bracken rhizomes in north of Wales. Their structures were elucidated using NMR spectroscopic and high resolution FT-ICR-MS data. were assessed for their anti-diabetic activity using an intestinal glucose uptake assay; all were found to be inactive at 300 µM. Isolation and characterisation of 13 pterosins and pterosides from bracken (Pteridium aquilinum (L.) Kuhn) rhizome

show abstract

Section: Introductionmentioning

confidence: 99%

Isolation and characterisation of 13 pterosins and pterosides from bracken (Pteridium aquilinum (L.) Kuhn) rhizome

et al. 2016

View full text Add to dashboard Cite

show abstract

“…For some time we have been interested in studying those traits that allow bracken to become a dominant component (Alonso-Amelot and Rodulfo, 1996;Alonso-Amelot et al, 1992, 1995, 2000. The two species of neotropical bracken in Venezuela (Ortega, 1991;Thomson and Alonso-Amelot, 2002) appear altitudinally segregated: P. caudatum (L.) Maxon (p.c.)…”

Section: Introductionmentioning

confidence: 99%

Phenolics and condensed tannins in relation to altitude in neotropical Pteridium spp

Alonso‐Amelot

Oliveros

Calcagno-Pisarelli

2004

Biochemical Systematics and Ecology

Self Cite

View full text Add to dashboard Cite

Two species of neotropical bracken, Pteridium caudatum (L.) Maxon (P.c.) and P. arachnoideum (Kaulf.) (P.a.), thrive dominantly in habitats extending from near the sea level to the Andean alpine zone around 3000 m altitude. The scope of sources of stress associated with elevation has three main components: plant competition for resources, activity of herbivores/pathogens, and climate. The contribution of each component varies greatly from place to place and bracken must respond with considerable physiological/genetic plasticity to maintain its dominant status in all these habitats. Phenolic compounds have a number of properties for plant adaptation to evolutionary selective forces of biotic and climatic nature, in particular with reference to their protective role against excessive solar radiation. We have examined the second of these properties by studying the dynamics of low (LMP) and high (HMP) molecular weight phenolics in neotropical bracken ferns in two groups of field experiments: (1) their variation during the phenologic development of blades in sympatric populations of both bracken species to examine the synthesis and allocation of these materials under similar conditions of competition, predation and solar UV-B radiation; (2) the contents of LMP and HMP in six bracken populations of P.c. along its typical altitudinal range [1180-2140 m above sea level (asl)] and six additional populations of P.a. (1880-3190 m asl), which grows at higher elevations in the western Andes of Venezuela, to investigate the phenolics' response to the ecological gradients associated with elevation in these plants. From series (1), we recorded the progressive accumulation of both types of phenolics with frond expansion, and hence increased surface of lamina exposed to sunlight, in P.c. and P.a. However, phenolics in mature blades of P.a. were 1.6 (LMP) and 3.26 (HMP) greater in amount than in P.c. From series (2), synthesis and accumulation of LMP was found to be Ã Corresponding author. independent of altitude, except for the subalpine population of P.a. at 3190 m asl, where a 167% increment of the average contents was recorded. By contrast, the levels of HMP correlated positively with elevation in both bracken species. The independent response of both types of phenolics to solar radiation may be interpreted as either more effective and metabolically cost-effective protection of HMP against UV-B light than LMP or differential light activation of key steps in the biosynthesis of HMP and LMP in bracken. #

show abstract

“…(2) Bracken is chemically well defended against herbivory (Cooper-Driver 1976, 1990Jones 1983;Jones and Firn 1979a, b) and competing plants (Gliesman 1976;Nava-R. et al 1987) with an array of toxins of wide structural spectrum (Fenwick 1989) that includes unique sesquiterpenes among the gymnosperms (Tanaka et al 1993). In addition, some of these compounds appear allocated in those plant parts that are more exposed to herbivory (Alonso-Amelot et al 1992). (3) Bracken invades new territory either by sexual reproduction (Braid and Conway 1943;Gliesman 1978) or by extension of its rhizome network very effectively (Daniels 1985a), and it is capable of sustaining repeated cutting of its fronds (Conway and Stephens 1954), clearing by fire or pesticide application (Vogl 1964).…”

Section: Introductionmentioning

confidence: 99%

Comparative spatial distribution, size, biomass and growth rate of two varieties of bracken fern (Pteridium aquilinum L. Kuhn) in a neotropical montane habitat

Alonso‐Amelot

Rodulfo-Baechler

1996

Vegetatio

Self Cite

View full text Add to dashboard Cite

Comparative spatial distribution, size, biomass and growth rate of two varieties of bracken fern (Pteridium aquilinum L. Kuhn) in a neotropical montane habitat AbstractA comparative field study of caudatum and arachnoideum, the two Pteridium aquilinum varieties of the caudatum subspecies known to grow in the neotropics, was performed in a montane savanna habitat of the Venezuelan Andes that was affected by wildfire. Frond size, ramet density and spatial distribution, blade and rhizome biomass, and frond elongation and expansion rates were measured in separate, isolated stands each containing only one bracken variety and covering approximately the same area (,-~540 m2). In addition to clearly discernible morphological differences, caudatum and arachnoideum were found to possess distinct features: caudatum tends to develop open stands of relatively shorter blades of 76.6 4-0.89 cm(# -t-SE) of rachis length and lower ramet density (1.6 fronds m -2, max. = 7 fronds m -2) whereas arachnoideum grows into longer, more expanded fronds 124 -I-1.6 cm tall and significantly higher ramet density (5.1 fronds/m 2, max. = 14.6 fronds m-z). The sum of aerial and underground biomass was found to be notably larger for arachnoideum (8522 4-614 Kg/ha) than for caudatum (1929 4-131 Kg ha -1) in stands growing under the same habitat conditions. Therefore the spatial distribution of arachnoideum appeared considerably more compact than that of caudatum. Blade growth rates and development time were also very different. Newly emerged caudatum croziers developed into mature blades within 42 to 48 days following an inverse exponential curve whereas arachnoideum blades required 70 to 75 days to reach maturity following a linear development. All the above dissimilarities are interpreted as the hitherto unreported indication of diverging growth strategies of two cohabitant bracken varieties following fire.

show abstract

Ontogenic variation of biologically active metabolites ofPteridium aquilinum (L. Kuhn) pterosins A and B, and ptaquiloside in a bracken population of the tropical andes

Cited by 27 publications

References 28 publications

Isolation and characterisation of 13 pterosins and pterosides from bracken (Pteridium aquilinum (L.) Kuhn) rhizome

Isolation and characterisation of 13 pterosins and pterosides from bracken (Pteridium aquilinum (L.) Kuhn) rhizome

Phenolics and condensed tannins in relation to altitude in neotropical Pteridium spp

Comparative spatial distribution, size, biomass and growth rate of two varieties of bracken fern (Pteridium aquilinum L. Kuhn) in a neotropical montane habitat

Contact Info

Product

Resources

About