The Ecophysiology of Veronica Chamaedrys, V. Montana and V. Officinalis. I. Light Quality and Light Quantity

In view of the contrasting ecologies of the closely related species Veronica chamaedrys, V. montana and V. officinalis, the morphological effects of changes in light quality and quantity were investigated using the technique of growth analysis. By definition, the term weight ratio refers to the quotient of the dry weight of a particular organ to the total dry weight of the plant. Three light climates were investigated: unshaded; muslin shaded (c. 37% full daylight, with no change in light quality); canopy shaded, using Ricinus zanzibariensis, also about 37% full daylight, but with lowered red:far-red (R:FR) ratio (...)