Chromosomal Variation among Brown Planthopper, Nilaparvata lugens (Stal), Biotypes in Korea

한국산 벼멸구 생태형의 염색체 변이

  • ;
  • R.C. Saxena (The International Center of Insect Physiology and Ecology, P.O. Box 30, Mbita, Kenya) ;
  • A.A. Barrion (University of the Philippines at Los Banos, Laguna 3720, Philippines)
  • Published : 1992.12.01

Abstract

Salient chromosomal variations during the first meiotic division in primary spermatocyLes of the three brown planthopper, Nilaparvata lugens (Stal) , biotypes were observed. The meiotic index was highest in biotype 3 (58.6), followed by biotype 1 (39.4) and biotype 2 (23.6). Total chromosomal aberration including agmatoploidy, aneuploidy, loose pairings of sex chromosomes, and cytoplasmic shrinkage was found high in the order of biotype 1 (60.6%),2 (47.9 %), and 3 (38.1 %). However, percent agmatoploidy was highest in biotype 2 (19.6%) whereas in biotypes 3 and 1, it was 9.5% and 2.5%, respectively. The number of cells with isolated sex chrosomomes was observed highest in biotype 2.