Fern Acylphloroglucinols: Structure, Location, and Biological Effects

Potent and Non-Cytotoxic Antibacterial Compounds Against Methicillin-Resistant Staphylococcus aureus Isolated from Psiloxylon mauritianum, A Medicinal Plant from Reunion Island

“…HRESIMS analysis of 2 revealed a molecular formula of C 27 H 36 O 8 ( m/z 489.2490 for [M + H] + ), implying 2 C and 4 H more than in Aspidin BB 1 . The 1 H-NMR spectrum displayed remarkably downfield-shifted singulet signals at δ H 15.86, 11.41 and, 10.05, which are characteristic of the hydroxyl groups found in acylphloroglucinols Aspidin derivatives [ 14 ]. The 1 H-NMR data of 2 were very similar to those for 1 except for the presence of a supplementary signal at δ H 1.39 (m) integrating four protons (H11 and H12), and a two methyl triplet at δ H 0.98 ( J = 7.4 Hz) and δ H 0.93 ( J = 7.1 Hz), which are the common signals for methyl terminal groups ( Table 1 ).…”

“…Crystallographic data were recorded at 150 K to reduce agitation induced by the length of the valeryl side chain. Compound 2 was named Aspidin VB, and although its presence has already been mentioned in the literature [ 14 , 15 ], this is the first time that it has been isolated and characterized.…”

Fern Family Clade Age and Fungal Pathogen Diversity

“…In corals, it was shown that older lineages with fewer coral diseases had stronger basal immune system functioning, lending credence to the general idea of resistance evolution (Pinzon et al ., 2012); however, the evolutionary history of the pathogens or of their resistance genes was not investigated. In ferns, I could find no reports of resistance to rust inoculation, nor any study that attempted to identify disease resistance mechanisms in ferns at the physiological or molecular level, in spite of a substantial literature on the chemistry of fern secondary metabolites (Socolsky, Hernandez, and Bardon, 2012; Vetter, 2018). It is certainly possible that the rust fungi in the Pucciniales and fungi in its sister orders (Helicobasidiales and Platygloeales) are ‘remnants’ of a once widespread rust occurrence in the fossil flora.…”

Anatomía comparada y análisis morfométrico en especies de Polystichum (Dryopteridaceae) del sur de Sudamérica

“…Sin embargo, en este trabajo, los pelos se han hallado en los ejemplares adultos de todas las especies y ampliamente distribuidos en los órganos (pecíolos, ejes foliares, lámina e indusios); resultaron especialmente útiles para diferenciar a P. mohrioides, P. andinum y P. tetragonum, los únicos taxones que presentan pelos glandulares en los indusios, el primero en toda la superficie y, los últimos, sólo en el margen. Además, resulta interesante destacar que la presencia de estos pelos glandulares en otros géneros de Dryopteridáceas, fundamentalmente en Dryopteris, Arachnoides y Elaphoglossum, está asociada a la producción de acilfloroglucinoles, compuestos polifenólicos que tienen propiedades antihelmínticas (Socolsky et al, 2012).…”