Seasonal Fluctuations of Lectins in Barks of Elderberry (Sambucus nigra) and Black Locust (Robinia pseudoacacia)

Abstract
Elderberry (Sambucus nigra) and black locust (Robinia pseudoacacia) agglutinins, which are abundantly present in the bark of both species, display seasonal fluctuations with regard to their content in this tissue. These seasonal change result apparently from a circa-annual rhythm of lectin accummulation and depletion during autumn and spring, respectively. Because the bark trees can be considered as a type of vegetative storage tissue, the results suggest that bark lectins behave as typical storage proteins.