Induced systemic resistance against X. axonopodis pv. citri. through chemical elicitors

Abstract

ISR elicitors viz., Salicylic acid, B-aminobutyric acid, Jasmonic acid, Isonicotinic acid, L-arginine, L-methionine and L-ornithine were evaluated in vitro (Pot culture), observations were recorded on Per cent disease intensity and lesion diameter of acid lime bacterial canker. The ISR elicitors (chemical) applied plants of acid lime revealed that, the mean per cent disease intensity, in all the treatments it was decreased over control. However, minimum mean per cent disease intensity was recorded with B-aminobutyric acid (08.00) followed by Salicylic acid (08.66), L-methionine (09.89), Jasmonic acid (13.11), Isonicotinic acid (17.78) and L-ornithine (19.66); whereas it was recorded maximum in L-arginine (19.88). After 15 days of challenge inoculation with X. axonopodis pv. citri, the lesion diameter decreased over control. However, no lesson was recorded with Salicylic acid and B-aminobutyric acid which were found significantly superior amongst the rest all; whereas, minimum lesion diameter was recorded with L-methionine (01.33). Decreasing trend in Lesion diameter after 30 days and 45 days of challenge inoculation with X. axonopodis pv. citri, over control was observed. However, minimum lesion diameter after 30 days and 45 days was recorded same with Salicylic and B-aminobutyric acid (01.33 and 02.67, respectively) and found superior over the rest all; whereas, it was found maximum with L-arginine (05.33 and 07.00, respectively) and L-ornithine (05.33 and 07.67, respectively).