Tree age-dependent changes in photosynthetic and respiratory CO2 exchange in leaves of micropropagated diploid, triploid and hybrid aspen.

The growth rate of triploid European aspen (Populus tremula L.) and hybrid aspen (P. tremula × Populus tremuloides Michx.

Inorganic ions in the medium modify tropane alkaloids and riboflavin output in Hyoscyamus niger root cultures.

Context: Hyoscyamus niger L. (Solanaceae) roots are rich of tropane alkaloids, such as hyoscyamine and scopolamine are used as the source of raw material for the pharmaceutical industry.

Aims: The aim of the present study was to investigate the effect of calcium, magnesium, and iron ions on the production of tropane alkaloids and excretion of riboflavin in H.