Because N972 would have segregated for genetic male sterility and self-fertility
and pollination was not controlled within the isolation chambers, N372 could have been composed of [S.sub.o], [S.sub.1], and/or [S.sub.1] plants.
Because dipterans are the most common visitors and they do not forage from flower to flower (Faegri and van der Pijl, 1971), self-fertility
would (1) allow seed-set in the absence of those insects that would more effectively transport pollen between plants through multiple visits in a single foraging flight and (2) possibly provide a measure of reproductive isolation for the self-fertile, self-pollinating C.
In addition, autotetraploid forms of bluebunch have increased levels of self-fertility
(Jensen et al., 1990).
Plant breeders have successfully selected for increased self-fertility
in cultivars of several predominantly outcrossing species (Villegas et al.
In order for herbicide resistance to be transferred from wheat to a jointed goatgrass population via a hybrid bridge, wheat alleles in the [F.sub.1] hybrids must be transmitted and retained in the backcross generations that are produced by backcrossing with jointed goatgrass until partial self-fertility
in crested wheatgrass would make it extremely difficult to produce sufficient seed to provide an adequate evaluation of [S.sub.1] progenies.
Although handled as if completely self-sterile ([S.sup.s][S.sup.s]), recent use of C78/3 progenitors as a recurrent parent in backcrossing programs has shown that some plants expressed varied degrees of self-fertility
To assess the potential for self-fertility
in the Agrostis species used in this study, unopened panicles from an individual plant were bagged together.
Selections in the B[C.sub.1][F.sub.3] through the B[C.sub.1][F.sub.8] generations were made for height, stalk quality, self-fertility
, and tolerance to excess water conditions as lines and in hybrid combinations.
has not been tested, but both L53 and L19 are self-fertile and this character may be segregating in SR96.
Crowne is uniform in growth expression, genetically stable (2n = 4x = 40), flowers prolifically, but has low self-fertility
Palisades is uniform in growth expression, genetically stable (2n = 4x = 40), and has low self-fertility