1. Induction of systemic resistance in rice to bacterial blight by 1,2,3-benzothiadiazole 7-carbothioic acid-S-methyl ester (BTH) treatments
- Author
-
S. S. Gnanamanickam and V. Karthikeyan
- Subjects
Inoculation ,fungi ,food and beverages ,Virulence ,Biology ,Plant disease resistance ,biology.organism_classification ,Horticulture ,chemistry.chemical_compound ,Xanthomonas oryzae ,Agronomy ,chemistry ,Seed treatment ,Bacterial blight ,Agronomy and Crop Science ,Rice plant ,Pathogen - Abstract
Use of BTH to evaluate the disease severity and induction of systemic resistance in rice to bacterial blight caused by Xanthomonas oryzae pv. oryzae is investigated. A new batch of 25 isolates of Xanthomonas oryzae pv. oryzae was obtained from infected rice lead tissues collected from Pattambi, Kerala, south India. Their identification was confirmed by the plant inoculation test on to IR24 rice plants which produced characteristic bacterial blight lesions. Among the 25 of X.o. pv. oryzae, four of the isolates were also virulent to IRBB21 rice plants (a near isogenic line of IR24) which carry the Xa-21 gene for BB resistance. The results confirm that there are pathogen strains in India which can overcome Xa-21. Development of BB lesions developed in IR24 (BB susceptible) plants after they were treated with BTH applications either as seed treatment or as foliar spray at 0.1, 0.5, 0.1 and 2.0 mM concentrations showed that even at 2.0 mM concentrations, IR24 plants were still susceptible to the pathogen. Ther...
- Published
- 2011