The similar chemical composition and the coexistence of different plants species can be strongly affected by the interactions between them. Due to the fact that generally the grasses present in grasslands grow as bushes separated by areas where the vegetation is missing, determined the researchers to consider that these plants have an allelophatic character. This study was realized to determine the allelophatic properties of Dactylis glomerata species and the capacity of the allelophatic substances to influence the perennial grasses quality (Festuca rubra, Lolium perenne and Poa pratensis). The plants were treated with low-alcoholic extracts of pyrrolizidine alkaloids , respectively ergot alkaloids obtained from Dactylis glomerata. The research design consisted of three repetitions. The plants were treated with low alcoholic extracts of pirolizidinici alkaloids, respectively ergot alkaloids obtained from the air part of Dactylis glomerata species, except the blank. The extracts were applied in three different doses: D1 = 10 ml, D2 = 40 ml, D3 = 80 ml. The preliminary chemical analysis of the extracts revealed the presence of the alkaloids (NAL - N-acetyl loline and NFL- N-formyl loline ). The identification of alkaloids was confirmed by HPLC-UV analysis. The results showed that the alkaloids influence the quality index change at the treated plants. That was reflected by a decrease in crude protein content, the highest sensitivity was noticed at Poa pratensis species.

lolinic alkaloids; chemical composition; quality; Dactylis glomerata

Presentation: oral