Modified kappa carrageenan as inducer of resistance in rice against bacterial leaf blight

Abstract

© 2018, International Society for Southeast Asian Agricultural Sciences. All rights reserved. Modified Kappa Carrageenan (MKC) was evaluated in the greenhouse as possible inducer or elicitor of resistance in rice against bacterial leaf blight (BLB) using two hybrid varieties: NSIC Rc202H (Mestizo 19) and NSIC Rc204H (Mestizo 20). Effects of MKC concentration, induction time, frequency of application and spray intervals on blight severity were evaluated using Xanthomonas oryzae pv. oryzae Race 3 (Xoo R3) from July 2014 to April 2015 at the National Crop Protection Center, University of the Philippines Los Baños. Effect of root soaking in MKC solution as a means of resistance induction was also evaluated. The study showed that Mestizo 19 (M19) and Mestizo 20 (M20) hybrid rice varieties have induced resistance trait. M19 gained resistance against BLB 6 hours to 12 days after spraying with 50 to 100 ppm solution of MKC as shown by the significantly shorter blight lesions compared with the untreated plants. M20 gained resistance after 6 hours up to 12 days after induction with 100 ppm solution of MKC. Spraying plants three times with 100 ppm solution of MKC at 7 days interval or spraying two times with 200 ppm solution of MKC at 10 days interval starting at 30 days after planting resulted in shorter blight lesions than the untreated plants. Soaking roots of Mestizo 20 hybrid in 100 ppm solution of MKC for five minutes resulted in shorter blight lesions compared with the untreated plants, an indication of induced resistance.

Source or Periodical Title

Journal of the International Society for Southeast Asian Agricultural Sciences

ISSN

8593132

Page

14-21

Document Type

Article

Subject

Hybrid rice, Induced resistance, Oryza sativa, Xanthomonas oryzae pv. oryzae

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