Figure 2

Time course of seed viability during wintering on dry (A) and flooded (B) paddy conditions in weedy rice (PBR, WD-3) and cultivated rice (Hopum, Ilpum). The seeds of 4 varieties (200 g each) were kept on the paddy from November 2009 to April 2010. One was a dry paddy(A) in the same way as the first wintering test and the other was a flooded paddy(B) in a plastic box (41.0 × 24.5 × 15.0 cm) with 10 cm depth of paddy soil (silty clay loam). During wintering, the seeds were sampled 5 times for a viability test. *Different small letters in a same date (for vertical comparison) indicate significant difference of means at α = 0.05 by Duncan’s Multiple Range Test. **Different capital letters in the same variety (for horizontal comparison) indicate significant difference of means at α = 0.05 by DMRT.