Changes in the Fitness of Brown Planthopper, Nilapawata lugens Stal (Homoptera: Delphacidae) to Several Resistant Rice Varieties after Multi-generational Selection

누대도태에 의한 벼멸구의 품종적응성의 변화

  • 송유한 (경남 진주시 가좌동 경상대학교 농과대학 식물자원환경학부) ;
  • 황인철 (경남 진주시 가좌동 경상대학교 농과대학 식물자원환경학부) ;
  • 김진호 (경남 진주시 가좌동 경상대학교 농과대학 식물자원환경학부)
  • Published : 2002.06.01

Abstract

This study investigated the changes in the fitness of brown planthopper, NilapaHata lugens, to several rice varieties with different resistance background, after multi-generational selection on a resistant rice variety. A susceptible strain of brown planthopper (Dongjin-5) had been reared on the Chungchungbyeo with Bph1 resistance gene for three generations (Chungchung-G3) and six generations (Chungchung-G6), then the fitness change was evaluated by measuring their longevity, fecundity, preferences, and survivorships on the varieties with various background of resistance. After being selected three to six generations on Chungchungbyeo, feeding preference, adult longevity, and fecundity increased, where as nymphal period reduced when they were reared on various varieties with Bph1 gene. The egg Periods were not much different among the varieties fed on, except for the Chungchung-G6 on the rice varieties of Milyang63 (bph2 gene) and Gayabyeo (Bph1+bph2 gene). These results suggest that the susecptible Donajin-5 (Biotype-1) can be easily converted to a resistant biotype-2 capable of overcoming the resistant varieties with Bph 1 gene.

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