ANTIXENOSIS AND ANTIBIOSIS MECHANISM OF RESISTANCEIN SELECTED RICE ENTRIES AGAINST BROWN PLANTHOPPER,NILAPARVATA LUGENS (STAL)S. Sukumar, J. S. Kennedy, M. Raveendran, V. Balasubramani and R. Pushpam
Six different rice entries along with susceptible and resistant check varieties were evaluated under glasshouseconditions for different parameters of antixenosis and antibiosis resistance against brownplanthopper(BPH, Nilaparvata lugens StÃ¥l). In antixenosis studies, proportion of insects settled on test entries in relationto the susceptible control TN1 was recorded, with average lower proportion of nymphs settled on N22-CCDTM-893 and Ptb 33 in relation to those on TN1. In antibiosis studies adult population, adultlongevity andpopulation build-up were recorded. N22-CC-DTM-893 and Ptb 33 displayed significantly better performanceas compared to other test entries in these parameters studied and did not differ from each other. Theseresults helped in relative quantification of BPH resistance levels in different test entries and N22-CC-DTM-893 show substantial levels of antixenosis and antibiosis effects on BPH and it is considered as new effectivesource of BPH resistance and can be used in resistance breeding after tagging of resistant genes/QTLslinked to brown planthopper resistance with selectable molecular markers.