TY - JOUR AU - STRATU, Anisoara AU - OLTEANU, Zenovia AU - LOBIUC, Andrei PY - 2015/12/13 Y2 - 2024/03/29 TI - Effect of Aqueous Extracts from Weed Species on Germination and Initial Growth in Raphanus sativus L. JF - Notulae Scientia Biologicae JA - Not Sci Biol VL - 7 IS - 4 SE - Research articles DO - 10.15835/nsb749705 UR - https://www.notulaebiologicae.ro/index.php/nsb/article/view/9705 SP - 464-470 AB - <p style="text-align: justify;">The current paper presents the results of a study on the effects of aqueous extracts from five weed species (<em>Amaranthus retroflexus, Cirsium arvense, Convolvulus arvensis, Echinochloa crus-galii, Setaria verticillata</em>) on germination and initial growth in <em>Raphanus sativus</em> L. The following indicators have been analyzed: indices of germination (the germination percentage; the speed of germination; the speed of accumulated germination and the coefficient of germination rate), the length of the root and hypocotyls, the pH of aqueous extracts, the UV-Vis absorption spectra of aqueous extracts. The results of the investigations showed the following aspects: the aqueous extracts reduced the values of calculated germination indices and root growth in the first ontogenetic stages of the test species; the pH of the extracts was slightly acid to neutral. Qualitative spectrophotometric analysis indicated the possible presence of phenolic and organic compounds in the extracts.<em> C. arvense, S. verticillata</em> and <em>E. crus-galii</em> presented the most pronounced effect on germination and growth processes.</p> ER -