Allelopathic tolerance in white lupine (Lupinus albus L.) accessions to Sorghum halepense extracts

Abstract

Modern farming requires a better understanding of the response of species, and in the particular experiment, of accessions, to the influence of weeds in order to develop agricultural systems that are more dependent on ecological interactions and less dependent on the use of pesticides. The present lab study aimed to estimate the tolerance of white lupine accessions to Sorghum halepense extracts on the seed germination and initial growth of the crop. Studied factors were: white lupine accessions – ten levels (Lp01, Lp04, Lp06, Lp10, Lp21, Lp23, Lp25, Lp27, Lp28 Lp29), aqueous extracts – two levels (shoot and root biomass of S. halepense) and concentrations of the extracts – four levels (1.0%, 5.0%, 10.0% and distilled water as control). The results showed a different tolerance of the ten accessions to allelopathic action of the aqueous extracts. Increasing concentrations of the extracts inhibited seed germination (by 5.0 to 10% in the different accessions), elongation and accumulation of primary germ (2.4 to 71.2% and 3.0 to 56.2%, respectively. The GGEbiplot analysis, representing the summary effect of the action of weed extracts on the germination and growth parameters in different concentrations, determined Lp 01, Lp 04 and Lp 10 as tolerant. Sensitivity exhibited Lp 21, Lp 25 and Lp 23. The correlation analysis of data showed that accessions whose seeds had a higher 1000 seeds mass, higher seed vigor index and protein content were less affected by the inhibitory effect of S. halepense extracts, respectively, they exhibited a higher tolerance.