Changes in total phenolic contents in resistant and susceptible barley cultlvars inoculated with the cereal cyst nematode, Heterodera avenae

The changes in total phenolic contents in the three barley cuitivars viz., DL 482 (susceptible), RD 2052 and C 164 (resistant) were studied after 30 days of Heterodera avenae inoculation. The total phenol content in the shoots of healthy and resistant cultivars was higher as compared to the susceptible cultivars. However, in the presence of nematode, the phenol content in the two resistant cvs. (RD 2052 and C 164) significantly increased as compared to the sustceptible cv. DL 482. In case of roots of the resistant cvs RD 2052, there was higher phenolic content as compared to other two cultivars, both with and without inoculation. A decreasing trend was also observed in the phenol content in the roots of inoculated susceptible and the resistant cultivars.