Is Juglone the Only Naphthoquinone in Juglans regia L. with Allelopathic Effects?

We investigated whether juglone is the only allelochemical in a leaf extract from walnut (Juglans regia L.). This was achieved through comparisons of effects pure (1 mM, 100 μM, 10 μM control juglone) and J. (prepared as 1 on seed germination, seedling growth, secondary metabolism selected crop vegetables. Two treatments were also applied, extraction medium water. For inhibition S. lycopersicum, B. rapa var. japonica, V. locusta more sensitive to mM juglone, L. sativa juglone. suggests that this contains specific phenolic substance(s) can stimulate germination some species inhibit it others. Seedling length than with selective strong root versus shoot by Juglone had significant sativa, particular for seedlings treated marked decreases all metabolites studied. Flavonols constituted majority these culinaris, which showed least sensitivity both treatments. Thirty compounds identified quantified first time plants,