Laboratory of Basic Research in Horticulture, Faculty of Horticulture and Landscape Architecture, Warsaw University of Life Sciences, Nowoursynowska 159, 02–776 Warsaw, Poland.
*Correspondence Author: E-mail: helena_gawronska@sggw.pl
Field-grown plants were harvested at inflorescence bud stage and the fresh weight of leaves, stems and inflorescences were recorded. Allelopathic activity of aqueous extracts of leaves, stems, inflorescences, roots, petioles and seeds was determined on mustard germination. The test genotypes differed significantly both in the biological yield (approx 9 folds) and in biomass partitioning (stems > leaves > inflorescences). Allelochemicals in leaf extracts, significantly delayed and decreased the mustard germination. Significant differences were also recorded between the plant organs, leaves showed highest and roots had no activity. Both allelopathic activity of particular organs and the biomass accumulated, together with its partitioning pattern were major components of allelopathic potential.
Biomass accumulation, distribution, genotypes, germination, Helianthus annuus L., organs, phytotoxicity, Pipper Index, Sinapis alba L.
