Vol. 10, Issue 12 (2021)

Author(s):
S Sukumar, JS Kennedy, M Raveendran, R Pushpam, P Jeyaprakash, RP Soundararajan, V Balasubramani and K Manonmani

Abstract:
Host plant resistance is an effective and environmentally friendly approach to manage brown planthopper. Though breeding for resistance to BPH was initiated earlier, identification of new resistant sources for BPH is still in progress. Screening for resistance to BPH results in identification of new resistant sources. Use of mutagenesis in breeding has involved forward genetic screens and selection of mutants with improved traits and their incorporation in breeding programmes. Hence studies were undertaken to screen a total of 432 Ethyl Methane Sulphonate (EMS) induced mutants were phenotyped using protray screening test (PST). Among the different rice mutants N22-CC-DTM-893 was considered as resistant and three other mutants N22-MG-145, N22-MG-491 and N22-MG-516 considered as moderate resistant. To study their mechanism of resistance, resistant mutants along with N22 were evaluated for the different parameters of antibiosis and tolerance experiments. These results helped in relative quantification of BPH resistance levels in the mutants. So N22-CC-DTM-893 is considered a new effective source of BPH resistance and could be used as new donors and utilized in resistance breeding programmes in rice.