Peer-Reviewed Journal Details
Mandatory Fields
Griffin, CT;Callaghan, KM;Dix, I
2001
February
Parasitology
A self-fertile species of Steinernema from Indonesia: further evidence of convergent evolution amongst entomopathogenic nematodes?
Published
34 ()
Optional Fields
HETERORHABDITIS REPRODUCTION RHABDITIDA SEX
122
181
186
More than 20 species of the entomopathogenic nematode Steinernema have been described; to date, all reproduce exclusively by cross-fertilization of male and female individuals. Steinernema sp. strain T87 from Indonesia was found to consist largely of self-fertile hermaphrodites. Progeny rr-ere produced bq morphological females both in insects (Galleria mellonella) and in hanging drops of insect haemol)mph inoculated with a single infective juvenile. Sperm were present in the oviduct of unmated morphological females. Approximately 1% of infective juveniles developed into males, and males were also present in the second generation where they constituted 1-6%, of the population. Under the same conditions the related species Steinernema longicaudum strain CB2B displayed typical steinernematid reproduction: cross-fertilization and a 1:1 sex ratio. It is argued that the development of hermaphroditism in Steinernema sp. T87 represents convergent evolution with Heterorhabditis, the other major genus of entomopathogenic nematode.
PORT CHESTER
0031-1820
Grant Details