Thermo-induction on Rice (Oryza sativa L.) Varieties and their Resistance Pattern-Foliage against Common Bacterial Leaf Blight Caused by Xanthomonas

Abstract

Bacterial leaf blight (BLB) caused by Xanthomonas oryzae pv. oryzae of the family Xanthomonadaceae is considered as one of the most serious diseases of Oryza sativa L. An experiment was conducted to assess the effect of temperature on the resistance pattern-foliage level of juvenile rice. Rice inbred cultivars PSB Rc82 (Peñaranda), NSIC Rc160 (Tubigan 14) inoculated with the isolated Xanthomonas sp. and controls were grown under two temperature conditions (34°C with humidity averaging 62.41% and 36°C with humidity averaging 59.17%) in an indoor lighting with 12h dark and 12 h light cycle. Evaluation of pattern-foliage response of inoculated plants revealed that PSB Rc82 is more susceptible to BLB than NSIC Rc160 under both temperature growth conditions especially in terms of length of the leaf from 0 DAI to 15 DAI. Also, at higher temperature of 36ºC, severity of BLB was limited.