Differential Seed Germinability in Triazine-Resistant and -Susceptible Giant Foxtail ( Setaria faberii )

摘要

Seeds from one triazine-resistant and two triazine-susceptible giant foxtail seed accessions were collected from plants grown in a greenhouse to characterize their germinability. Plants were grown in a greenhouse during mid to late summer and again during late autumn. Differential plant development from planting to first flowering among biotypes was not evident. Seed production of the susceptible biotypes either equaled or exceeded that of the resistant biotype. After harvest, seeds were placed under stratification involving 4^oC, darkness, and moisture. Seed germination assays conducted after 0 and 4 weeks stratification resulted in very low percent germination for all biotypes. After 10 weeks stratification and subsequent germination assays, the resistant biotype had a lower percent germination than either susceptible biotype. Germination rates were similar among biotypes.