Influence of allelopathic activity of Galinsoga parviflora Cav. and Oxalis fontana Bunge on the early growth stages of cultivars Raphanus sativus L. var. radicula Pers

Abstract

The aim of the study was to evaluated the influence of aqueous extracts from Galinsoga parviflora and Oxalis fontana on the germination capacity and energy of Raphanus sativus var. radicula in three cultivars: ‘Krakowianka’, ‘Poldluga’, ‘Rowa’. After eight days of germination, the length of seedlings, the fresh and dry mass, the percentage of water content and the degree of destabilisation of cells membranes by measuring the outflow of electrolytes were determined. The aqueous extracts from fresh mass of aboveground parts of G. parviflora and O. fontana with concentrations of 5, 10 and 15% were used. The control group consisted of seeds watered with distilled water. The germination capacity in all radish varieties decreased with increase in the concentration of G. parviflora and O. fontana aquatic extracts. The length of underground parts of seedlings was significantly shorter on Petri dishes with extracts from O. fontana. With increasing concentration of extracts, the length of aboveground parts of seedlings on O. fontana extracts decreased, and on G. parviflora increased. In the case of fresh and dry mass, the extracts stimulated the growth of seedlings, with the exception of the ‘Krakowianka’ cultivar on substrates with 5% extracts. At the lowest concentrations of the extracts, the smallest percentage of electrolyte leakage was observed. For all three types of radish watered with extracts from O. fontana higher destabilisation of cell membranes was observed.