Uptake of Seeds Secondary Metabolites by Virola surinamensis Seedlings

New butenolides in plantlets of Virola surinamensis (Myristicaceae).

A phytochemical investigation in plantlets of the Brazilian medicinal tree Virola surinamensis resulted in the isolation and structural determination of four new compounds: 3-hydroxy-4-methyl-2-(11'-piperonyl-n-undecyl)-butenolide; 3-hydroxy-4-methyl-2-(7'-piperonyl-n-heptyl)-butanolide; 9'-(3,4-methylenedioxy-phenyl)-nonanoic acid and 13'-(3,4-methylene-dioxyphenyl)-tridecanoic acid. Thirteen ...

The water relations of two tropical rainforest species (Virola surinamensis and Eperua falcata): Is Virola unusual as previously reported?

The objective of this study was to examine the water relations and hydraulic architecture and vulnerability to cavitation in Virola surinamensis and V. michelii and to compare to similar measurements in Eperua falcata. In several previous reports Virola was seen to have a rather narrow range of xylem pressure potentials (Ψx) near zero in the course of a wet-season day while having water fluxes ...

Evaluation of changes in phenolic compounds and secondary metabolites of calluses and seedlings of Mellissa officinalis L. under cadmium heavy metal stress

The present study was designed and conducted to investigate the effect of different concentrations of cadmium on some physiological parameters and changes in secondary metabolites in the medicinal plant Mellissa Officinal L. under in vitro culture conditions. For this purpose, first sterile seeds of Mellissa Offcinali L. were sterilized and then cultured in MS medium. Then 28-day-old seedlings ...

Sudden exposure to solar UV-B radiation reduces net CO(2) uptake and photosystem I efficiency in shade-acclimated tropical tree seedlings.

Tree seedlings developing in the understory of the tropical forest have to endure short periods of high-light stress when tree-fall gaps are formed, and direct solar radiation, including substantial UV light, reaches the leaves. In experiments simulating the opening of a tree-fall gap, the response of photosynthesis in leaves of shade-acclimated seedlings (Anacardium excelsum, Virola surinamens...

Biosynthesis of tetrahydrofuran lignans in Virola surinamensis