Directional Change of Quantitative Characters in Trisomics Studies on the Trisomics in Rice Plants (Oryza sativa L.) II.

Abstract

Changes of six quantitative characters in the trisomic rice plants identified by the morphological features were studied by the principal component analysis. The applica-tion of this analysis proved to be effective in gl-ouping the respective single trisomics, double trisomics and disomics. Lines identified as different types of the trisomics com-posed different groups in the scatter diagram allowing a little overlapping. Disomic plants segregated from the progenies of trisomics, which had been derived from four different cultivars, tended to form different groups, showing: the difference in their genetic backgrounds. Sorne types of double trisomics under investigation demonstrated to have been typically changed to the direction synthesized by the characters of two single trisomics with respective chromosomes. This fact indicates that the addition of an extra chromosome has an independent specific effect on the expression of character's not only of single but also of double trisomic plants.