PJB-2019-488
Phytotoxicity of Melia azedarach L. leaf extracts on seed germination and seedling growth of many crop species and LC/MS characterization of their phenolic constituents
Akacha Maroua
Abstract
We evaluated the allelopathic potential of Melia azedarach L.(M.azedarach) using aqueous and ethanolic leaves extracts on germination and early seedling growth of some crop species (lettuce, sunflower, pea, maize, lens, radish and wheat). Studied extracts had in general inhibitory effects on seed germination and growth with percentages that could reach 100% (for lettuce). However, this influence was stimulatory as found for radish and lettuce aerial parts. In addition, observed effects varied with used doses of extract as well as solvent (alcoholic extract was more effective than aqueous one). Target species and organs did not respond in the same way (Root length inhibition was more obvious than shoot length) probably in relation with their secondary metabolites contents. Phenolics deserve mention; in consequence, they were investigated herein in leaves by LC-PDA-MS. Different flavonoids and phenolic acids such as malic acid, p-coumaric acid and their derivatives. 3,4,5-Tricaffeoylquinic acid was also detected. Several quercetin and kaempferol glycosides were identified, i.e., rutin, quercetin dihexoside, kaempferol-3-O-glucoside and kaempferol-3-O- rutinoside.
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