Abstract
The Journal of the National Science Foundation of Sri Lanka publishes the results of research in all aspects of Science and Technology. The journal also has a website at http://www.nsf.gov.lk/. 2021 Impact Factor: 0.682The JNSF provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge.
Highlights
The brown planthopper (BPH), Nilaparvata lugens (Stal) (Homoptera: Delphacidae) is one of the most destructive monophagous insect pests of rice throughout the rice growing countries in Asia
The present study evaluated Oryza nivara accessions collected from different locations in Sri Lanka for bph[2] and, antibiosis and antixenosis effects of O. nivara accessions harbouring bph[2] gene on BPH
Bioassay by conventional seed box screening test revealed low damage scores with O. nivara accessions and Ptb 33 that showed positive results for KAM 04 primer. This indicates the presence of high level of resistance to BPH in O. nivara accessions harbouring bph[2], which is similar to that of Ptb 33 (Figure 2)
Summary
The brown planthopper (BPH), Nilaparvata lugens (Stal) (Homoptera: Delphacidae) is one of the most destructive monophagous insect pests of rice throughout the rice growing countries in Asia. The BPH damages the rice plant directly by sucking the phloem sap and plugging the xylem and phloem with their feeding sheaths, which causes serious yield reductions (Sogawa & Cheng, 1977). It has been reported that host plant resistance is the most economic, least complicated and environmentally friendly approach for protecting crops against insect pest damage (Pathak & Kush, 1979). The presence of host plant resistance against BPH in rice was first reported by Pathak et al (1969). It has been reported that the resistant varieties suppressed the weight gain of nymphs and maintained low BPH populations across multiple generations in a large production area (Cohen et al, 1997; Jung & Im, 2005). Resistant rice plants exhibit two strategies against BPH: antixenosis and antibiosis. Antixenosis affects insect settling, colonization or oviposition and antibiosis reduces insect feeding, growth rate or survival (Alarn & Cohen, 1998)
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