Seedling growth of weedy and cultivated rice (<i>Oryza sativa</i> L.) genotypes in response to cold stress under normal seeding depth of 1.5cm.

a Means followed by the same letter differ by Scoot-Knott test at 5% level, using square root data transformation in the form: y + 0.5-sqrt (y + 0.5). Shoot length was the average of five seedlings measured per replication per genotype, at 14d of incubation. b Seeds were germinated in the dark at 18/13°C, 16/8h cycle temperature fluctuation. Shoot length reduction was calculated relative to control seedlings grown at 25°C; reduction = [(control—cold stress)/control]*100. cAccessions showing <50% reduction in shoot length under cold stress were deemed cold-tolerant. Means were compared using t-test at P≤0.05 Seedling growth of weedy and cultivated rice (Oryza sativa L.) genotypes in response to cold stress under normal seeding depth of 1.5cm.