In contrast, when isogeneic colonies (i.e., clonemates) grew into contact, the gastrovascular systems of the two colonies fused.
All isogeneic (i.e., involving explants from the same colony) and all but two parent-offspring pairings fused permanently (unreported data).
Vascular anastomoses were not observed in any of the 114 allogeneic and isogeneic zooids transplanted in these experiments.
After the takeover phase of blastogenesis, all or most parts of the allogeneic and isogeneic tissues were resorbed and had disappeared, leaving behind a clear tunic matrix or a space occupied by the new generation of developing zooids [ILLUSTRATION FOR FIGURE 1b OMITTED].
The ExF34-derived near isogeneic line population was shown to be polymorphic in two regions.
Cora location in 1996; DI, disease incidence; DS, disease severity DX, disease index: IF, infection frequency; IS, infection severity: QTL, quantitative trait loci; NIL, near isogeneic line; RAPD, random amplified polymorphic DNA; RFLP, restriction fragment length polymorphism, RIL, recombinant inbred line; R95, Ridgway location in 1995: R96.
Fine mapping of the QTL in near isogeneic
line populations derived from the eight lines that segregated for SCN resistance (Table 1) is ongoing.
The possibility that this QTL is involved in SDS tolerance will be explored by estimation of IF, IS, and DX in near isogeneic
lines in 1996.