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The dormancy status of S. faberi seed at abscission was assessed withreference to tiller and panicle development. Seed from a single genetic linewere grown under field, greenhouse and controlled environment growth chamberconditions. At abscission, a small fraction (<10%) of S. faberi seed germinatedunder favorable conditions. Seed were dissected and germination of caryopsesand embryos also tested. Removal of seed structures exterior to the embryoincreased percentage germination. As the seed rain progressed mean percentagegermination and variation among samples increased. Changes in germination werecorrelated with tiller development and relative time of seed maturity within apanicle. Seed produced on tillers that developed earlier were more likely to bedormant than seed from later-developing tillers. Seed that matured later on apanicle were more likely to germinate than seed that matured earlier on thesame panicle. A consistent trend toward later maturing seed having lessdormancy was found for seed grown under different environments which implies aninherent or parental source for variation in giant foxtail seed dormancy. Thevariation in percentage germination at abscission and following stratificationtreatments indicates that the S. faberi seed rain consists of individual seeds,possibly each with a different degree of dormancy.

Weedy Adaptation in Setaria spp.: VII. Seed Germination Heteroblasty in Setaria faberi