RESUMEN

Heterorhabditis bacteriophora is an entomopathogenic nematode that has potential as a biological control agent. As a first step in the genetic analysis of this nematode, we induced and isolated a short nematode (dumpy) from the F2 progeny of an EMS mutagenized nematode. Phenotypically, the dumpy adult is 60% shorter than the wild type. There is almost no longitudinal growth after the infective juvenile stage. Dumpy is completely recessive with 100% penetrance and uniform expressivity. When F1 progeny were allowed to self, F2 progeny segregated wild: dumpy in a 15:1 ratio (chi 2 = 0.634, .5 > P > .2). This dumpy mutation (Rhdpy) complements another dumpy mutation isolated in Israel and is the second gene known for this species.

Asunto(s)

Mutación , Rhabditoidea/genética , Animales , Cruzamientos Genéticos , Metanosulfonato de Etilo , Femenino , Prueba de Complementación Genética , Masculino , Mariposas Nocturnas/parasitología , Control Biológico de Vectores

RESUMEN

The inheritance of the sesquiterpene zingiberene was analyzed in segregating progeny of interspecific crosses among Lycopersicon hirsutum f. hirsutum Humb. and Bonpl. (hir), L. esculentum Mill. cv 'Nova' (esc), and L. hirsutum f. glabratum C.H. Mull (gla). The presence of zingiberene was inherited as a single dominant gene from hir in F2 and BC progeny of esc x hir, and as a single recessive gene in F2 and BC progeny of gla x hir. The segregation of esc x hir, gla x hir, and esc x gla progeny supported a single locus allelomorphic model in which the presence of zingiberene is controlled at a single locus, Z, where the allele from hir confers presence of zingiberene and is dominant to the allele from esc but recessive to that from gla. The presence of zingiberene in esc x hir progeny was not linked to the ability to set fruit or to several fruit characters, and progeny with zingiberene levels comparable to hir were recovered.