Juglans spp., juglone and allelopathy.

摘要

The occurrence of allelopathy in walnuts (Juglans spp.) is reviewed. The historical background is outlined. The effects are discussed of J. nigra on crop plants (grapes, tomatoes and apples), co-planted trees, and natural vegetation, and of J. regiaon other plants and phytoplankton. Secondary metabolites of Juglans spp. are described, with particular reference to juglone, pest management and germination and seedling growth. Interspecific and intraspecific, and seasonal variation in allelopathy inwalnuts, and variations in the effects on other plants are also discussed. Plant species which have been reported to be affected or unaffected by J. nigra are tabulated. Finally, soil effects of juglone are outlined.