Abstract

Pachyrhizus seeds-induced toxicity is very well-known to have developed in humans, fishes, insects, and some micro-organisms. Yet, there is a paucity of studies addressing it in their germplasm, as well as its effects on some phytopathogens. This work aimed to assess the Pachyrhizus genetic variability on toxicity and to determine Pachyrhizus extract toxicity on Sclerotium rolfsii and Ralstonia solanacearum in vitro. In the findings, it was shown to only have toxicity genetic diversity in immature seeds. Its toxicity in mature seeds was very high and its genetic variability was not detected. There was a toxic effect on S. rolfsii and R. solanacearum.  In S. rolfsii it was determined that the most toxic dose was 1: 1000 with P40 genotype. It decreased the mycelial growth by 72% following 5 days. In R. solanacearum it was determined that the most toxic dose was 1:200 with P40 genotype. It reduced bacterial multiplication by 57% between 24 and 48 h.

Key words: Pachyrhizus extract, genetic variability, toxicity, Sclerotium rolfsii, Ralstonia solanacearum.