Parallel developments in anthecology took issue with autogamy
Thus, for achieving appropriate [N.sub.e(v)]'s, increasing autogamy
in polymorphic materials makes seed collection more difficult, but accession regeneration much easier, provided excessive loss of accessions is avoided (u [is greater than or equal to] 0.80).
Breeding system results on the four populations and autogamy
rates of their progeny in an insect-free greenhouse.
grahamiae; Anderson et al., 2000b), autogamy
perhaps provides an alternative to the presumed entomophilous pollination system of colonizers.
Then, on 12 plants randomly chosen from the 30 representatives of each generation, we measured a suite of reproductive characters including self-compatibility, cross-compatibility, anther-stigma proximity, corolla tube length, level of automatic self-pollination, seed-set from automatic self-pollination (autogamy
), level of anther indehiscence (P.
only five [F.sub.1] hybrids (three from AG-S4 X G31276 and two from AG-S4 X G31317) freely set pods in the greenhouse, indicating self-compatibility and autogamy
. Of the five autogamous hybrids, all produced rhizomes.
nuttallii clade is characterized by species with very small population sizes (and autogamy
It is important to realize that reproductive barriers can act on every level between complete and weak isolation and that the entire range between autogamy
and allogamy can be found.
Mating-System Studies.--I will use the term autogamy
to refer to seed production by autonomous pollination within a blossom.
Inbreeding depression for rates of autogamy
has been observed in Limnanthes alba (Jain 1978) and Lupinus nanus (Karoly 199 1), and these results may have been caused by inbreeding depression for pollen viability.
Such species are generally self-compatible and often have floral mechanisms (e.g., autogamy
, cleistogamy) that assure high seed set (Baker 1965; Lloyd 1980).
In cultivated rice, usually autogamy
is seen but natural cross pollination can also occur at low rates (Reona and Pahm, 1980).