XVI International Botanical Congess

The reported potential for the spread of L. salicaria from stem and root pieces and its ability to inhabit dry and flooded areas implies the presence of some unique anatomical characteristics and a degree of anatomical and morphological plasticity. The potential for vegetative spread from stem and root pieces was assessed, and the anatomy of tissues involved in the lateral spread was determined. Morphological and anatomical responses to flooded and dry conditions were assessed under greenhouse and field conditions. VA-mycorrhizal colonization, shoot and root fresh and dry weights, stem and root diameters and shoot heights were compared across a water gradient. Anatomical characteristics of roots and shoots were determined using light, fluorescence and scanning electron microscopy. The relationship between these characteristics and water availability and the relationship between anatomical characteristics and vegetative spread of L. salicaria will be discussed.