For germination tests, seeds harvested from the same batches were cold pretreated and then grown on modified Murashige and Skoog medium supplemented with Glc, Suc, NaCl, ABA, glufosinate ammonium, or fluridone at various concentrations listed in the “Results.” The medium was autoclaved and cooled to 50°C to 60°C prior to the addition of filter-sterilized ABA, glufosinate ammonium, or fluridone. For root elongation experiments, cold-pretreated seeds from different genotypes were first grown on agar plates with 1% Suc for 4 or 5 d, then uniform seedlings of similar size and primary root length were transferred to appropriate fresh medium and grown vertically for another 6 or 7 d.