HYBRIDIZATION OF RACES OF HETERODERA-GLYCINES

  • 1 January 1978
    • journal article
    • research article
    • Vol. 10  (2) , 114-118
Abstract
Progeny from single females of 4 known races of H. glycines Ichinoche were used to establish relatively uniform populations. Single females from these populations were mated with males of other races in all possible combinations to study compatibility and inheritance patterns. When race 1 or 3 was crossed with either race 2 or 4, there was a significant reduction in number of females and a greater number of eggless females than in crosses of races 1 .times. 3 and 2 .times. 4. More females matured and fewer were eggless when mating were of the same race. Parasitic capabilities of races 2 and 4 were dominant or partially dominant over those of races 1 and 3, based on parasitism of F1 hybrids. Segregation patterns were generally similar for reciprocal crosses between races. There appeared to be either 1 or 2 major genes segregating for parasitism of ''Pickett'' soybean in the different crosses. A hybrid isolate (race 3 .times. 4) that differed in parasitic capability from the 4 known races produced as many females on the resistant soybean genotype, PI 90,763, as on the susceptible Lee cultivar. Those data indicate that isolates of H. glycines with a different parasitic capability may develop from gene recombination.

This publication has 0 references indexed in Scilit: