Reference "Identification and genetic analysis of a thermo-sensitive seedling-colour mutant in rice (Oryza sativa L.)"

Reference ID

7019

Title

Identification and genetic analysis of a thermo-sensitive seedling-colour mutant in rice (Oryza sativa L.)

Source

Breeding Science, 2001, vol. 51, pp. 1-4

Authors (4)

Dong-Y-J	Dong-W-Q
Shi-S-Y	Jin-Q-S

Abstract

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°C, 26.1°C, 30.1°C) in growth
chambers. The results showed that the seedling colour of the mutant 7436S was
white (23.1°C), light yellow (26.1°C) and normal green (30.1°C) at 10 days after
sowing and yellowish green (23.1°C) and normal green (26.1°C, 30.1°C) 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 F2 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 F2 generation, the results
indicated that the tsc-1 gene was located on chromosome 11.