Year: 2000
Type: article
Abstract: The effects of these dwarfing genes at the sd1 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., ‘Fujiminori’ and ‘Shiokari’ and ‘Tamanishiki’. Chilling treatments at 2°C without illumination for three, four and five d were conducted at the 1- and/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 sd1 locus showed lower survival percentages than their respective parental varieties in the 3-or 4-day treatments at the 1-leaf stage. The survival percentages of ‘Kotaketamanishiki’ and the isogenic line of ‘Shiokari’ were higher than those of their respective parental varieties through all the treatments. Fukei 71 containing d12 showed lower survival percentages than ‘Fujiminori’ in the 3- and 4-day treatments at the 1-leaf stage. It is inferred from the results in the present study that the dwarfing genes at the sd1 locus and d12 lower the chilling tolerance at the seedling stage whereas d18-k enhances it.
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W219618806