Relation between Dwarfing Genes and Chilling Injury at Seedling Stage in Rice.

The effects of these dwarfing genes at the sdl locus, d18-k (kotaketamanishiki dwarf) and d12 (yukara dwarf) on the chilling tolerance at the seedling stage of rice plants (Oryza sativa L.) were investigated. We used isogenic lines developed by backcrosses, and artificial or natural dwarf mutants, together with their parental varieties, i.e., •eFujiminori•f and •eShiokari•f and •eTamanishiki.•f Chilling treatments at 2•Ž without illumination for three, four and five d were conducted at the 1and/or 2-leaf stages. The chilling tolerances of the lines were evaluated by survival percentages 22 d after the treatments. The isogenic lines of the dwarfing genes at the sdl locus showed lower survival percentages than their respective parental varieties in the 3-or 4-day treatments at the 1-leaf stage. The survival

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