Natthidech Beesa, Kansiree Jindapunnapat, Buncha Chinnasri, and Thanunchanok Chairin

DOI: 10.14456/sjst-psu.2022.5

pp. 26 - 31

Abstract

Root-knot nematode (RKN) has been reported to damage various rice cultivars in many countries. This study was conducted to evaluate the resistant levels of rice to M. graminicola infection. Each plant was inoculated with 100 second stage juveniles of RKN and their resistance was checked 15 days post inoculation. The result showed that among all six evaluated rice cultivars, RD6 exhibited the highest resistance against RKN by showing the lowest of gall numbers and gall index. Moreover, it is demonstrated that high resistance of RD6 cultivar was correlated with increasing defensive enzyme activities of PAL, PPO and POD during early inoculation. In contrast, KDML105 was the most susceptible cultivar, showing the greatest gall numbers and percentage of females inside rice roots. In addition, defensive enzyme activities were not significantly different from control (uninoculation). Therefore, RD6 cultivar might be useful for the breeding program to control RKN in further studies.