Biochemical basis of resistance against root knot nematodes in chilli (Capsicum annuum L.)

Abstract

Chilli (Capsicum annuum L.) is an important and versatile vegetable cum spice crop. A study was conducted to understand the biochemical mechanism in two resistant advanced lines developed (ACRIL 90, ACRIL 70) along with two susceptible genotypes (Arka Mohini, Arka Suphal) , with and without incouation of RKN, M. incognita. The results showed that there was a significant increase in antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (PO), and polyphenol oxidase (PPO) in resistant genotypes compared to susceptible genotypes upon inoculation of nematodes. Resistant genotypes also recorded significant higher contents of lignin, phenol, and protein than the susceptible ones. Thus the current study proves that antioxidant enzymes, lignin and phenol contents play a significant role in inducing resistance in host plants against M. incognita.