Identification and Genetic Analysis of a Thermo-sensitive Seedling-colour Mutant in Rice(Oryza sativa L.)

概要

論文の詳細を見る
A thermo-sensitive seedling-colour mutant 7436S was detected in the field from a breeding nursery in China, in 1991. The experiments were conducted at artificially controlled temperatures(23.1℃, 26.1℃, 30.1℃)in growth chambers. The results showed that the seedling colour of the mutant 7436S was white(23.1℃), light yellow(26.1℃)and normal green(30.1℃)at 10 days after sowing and yellowish green(23.1℃)and normal green(26.1℃, 30.1℃)at 20 days after sowing, respectively. It was concluded that its thermo-sensitivity decreased gradually with the increase of the seedling age. In addition, its thermo-sensitivity for seedling colour was oriented, as white seedlings turned green at high temperatures, but not in the opposite direction. The segregation ratios in the F_2 populations showed that a recessive nuclear gene(tentatively designated as tsc-1)controlled the thermo-sensitive seedling-colour character. Based on genetic linkage and the recombination value(34.1%)between the tsc-1 gene and short panicle morphological marker(sp)gene in the F_2 generation, the results indicated that the tsc-1 gene was located on chromosome 11.
日本育種学会の論文