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Resistance-breaking ability and feeding behavior of the brown planthopper, Nilaparvata lugens, recently collected in Korea
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/291663
Resistance-breaking ability of wild brown planthopper (BPH), Nilaparvata lugens, on resistant rice cultivars has been reported in many Asian countries. To understand the development of resistance-breaking ability of wild BPH in Korea, we conducted the nymphal survivorship test and the electrical penetration graph (EPG) on susceptible and resistant rice cultivars with four different BPH populations, which were collected in the early 1980s (S-BPH), 2005, 2006, and 2007, respectively. The S-BPH showed low survival rates on resistant rice cultivars carrying Bph1 and bph2, respectively. On the other hand, recent(2005~2007) wild BPH populations seemed to have high resistance-breaking ability because they maintained elevated survival rates on most other resistant rice cultivars except Gayabyeo (Bph1 and bph2) and Rathu Heenati (Bph3). In the EPG monitoring, however, wild BPHs could not easily feed on the phloem sap of resistant rice cultivars, Cheongcheongbyeo (Bph1), ASD7 (bph2), and Gayabyeo. Wild BPHs spent more time on reaching the phloem sieve elements of resistant cultivars. Ph waveform duration and honeydew excretion amount of wild BPHs also decreased. From the results, we suggest that though recent wild BPHs collected in Korea have high resistance-breaking ability simultaneously on rice cultivars carrying Bph1 and bph2 through the increase of survivorship, they still have to pay some cost to feed on the phloem sap of resistant rice cultivars.
