DEVELOPMENT OF RESISTANCE SYSTEM IN RICE PLANT AGAINST BLAST DISEASE CAUSED BY Magnaporthe oryzae USING SELECTED NOVEL CHEMICALS

Abstract

ABSTRACT The present study was conducted in Sher-e-Bangla Agricultural University (SAU) during Boro season 2019-2020.The pot experiment was conducted in net house with CRD design and the field experiment was conducted in central farm of SAU with RCBD design. To conduct the experiments BRRI dhan 28 was used as a cultivar and in total six compounds viz. salicylic acid (T 1 ), potassium silicate (T 2 ), silica gel (T ), P cattle urine (T 4 ), Peak Performance Nutrient (T 5 ), N-cattle urine (T ) were selected to develop induced resistance system in rice plant. From the study, it was revealed that all of the selected novel chemicals showed some extent effectiveness over control to develop the resistant system in rice plant upon artificial inoculation of pathogen in pot and natural condition. Among the selected novel chemicals, cattle urine gave better result to develop the induced resistant system in rice plant upon artificial inoculation as well as in foliar spray. Potassium silicate (@ 4gL -1 6 ) and PPN (@ 8 gm/L) also gave the satisfactory result and plants showed resistance against blast pathogen. Silicon (Si) is known as a ―beneficial element‖ for plants. The direct and indirect benefits of the element for crops (especially grasses) are related to resistance to diseases, pests a drought that again proved from the current study. In this study, yield and yield contributing character like tiller number, panicle mass, plant height (cm) and grain yield (kg) were also studied. Satisfactory results were found in case of treatment cattle urine and potassium silicate. However, it may be concluded that compounds like animal bio-products and silicon containing chemicals can be used to develop resistance system in rice plant against blast pathogen.

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