Screening of germplasm to identify new source of resistance against brown plant hopper, Nilaparvata lugens (Stå ͦl) infesting rice
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Date
2022-08
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G.B. Pant University of Agriculture and Technology, Pantnagar, District Udham Singh Nagar, Uttarakhand. PIN - 263145
Abstract
Studies on screening of various germplasm to identify new source of resistance against brown planthopper, Nilaparvata lugens (S t aͦ l) infesting rice were carried out during kharif 2021 under glasshouse condition at Department of Entomology, College of Agriculture, G. B. Pant University of Agriculture and Technology, Pantnagar. The primary objective of evaluating the rice germplasms was to categorize the sources of resistance in rice to BPH by screening the germplasm accessions using standard seed box screening technique (SSST). The results of experiment showed that among 695 germplasm, 02 germplasm were found to be highly resistant, 07 were resistant and 32 were found to be moderately resistant while 91 and 536 germplasm were found to be moderately susceptible and susceptible, respectively. The selected 19 PHSS rice germplasm were investigated for resistance mechanism using an antixenosis, antibiosis, tolerance mechanism. Results demonstrated that least honeydew production was recorded in IR-65482-7-2- 216-1-2-B (102.3 mm2) by BPH while antibiosis mechanism by nymphal survival was found least in RP 2068-18-3-5 (20.0 %) as compared to the susceptible check TN1 where honeydew production and nymphal surivival was 519.0 mm2 and 76.7 %, respectively, for both the mechanisms, respectively. ASD7 (Acc 6303) was found to have highest tolerance under days to wilting due to BPH infestion in rice seedlings. The study also revealed that ASD7 (Acc 6303) had least (5.29 n mol/min/g FW) Malonaldehyde content before infestation. However, after infestation with BPH, the Malonaldehyde was found to be least in PTB 33 (7.01 n mol/min/g FW) thereby it showed resistant germplasm against BPH. Growing BPH resistant rice varieties to suppress the insect is one of the dependable methods of pest control and an important component of IPM programmes. Adoption of BPH-resistant