Further Studies of Cytoplasmic Incompatibility in Local Populations of Laodelphax striatellus in Japan (Homoptera: Delphacidae)

Abstract

Based on cytoplasmic incompatibility, Japanese local populations of Laodelphax striatellus are divided into two groups in accordance with their localities: northeastern and southwestern. Crosses between females of northeastern group and males of southwestern one were sterile whereas the reciprocal crosses were fertile. Test crosses of three newly collected populations, Ishigaki, Kagoshima, and a migrant population from the East China Sea showed that all three belonged to the southwestern group in regard to their crossing type. Some eggs, however, deposited by incompatible male and female pairs exceptionally developed to nymphs. To examine whether the nymphs were hybrids, crossing experiments were undertaken between red-eyed mutant females of the northeastern group and black-eyed wild type males of the southwestern. The mutant gene of red eye was recessive on an autosome and was inherited by F2 or BC1 generations through these crosses. It is, therefore, concluded that normal fertilization occurred in some incompatible eggs. © 1987, JAPANESE SOCIETY OF APPLIED ENTOMOLOGY AND ZOOLOGY. All rights reserved.