Analysis of Quantitative Trait Loci (QTL) for Plant Height and the Relation between these QTL and QTL for Yield Traits in Rice

QTL for plant height (PH) were determined in two F 2 populations each derived from an indica/indica cross of rice. Four QTL for PH were detected in o ne population by employing a molecular linkage map of 112 markers, all of which displayed over dominance or complete dominance. In another population, three Q TL for PH were detected by employing a map of 160 markers, all of which display ed partial dominance. Each QTL explained 5.6% to 22.9% of the phenotype variatio n. Seven digenic interactions for PH were detected in one population, and the addi tive×additive interactions were predominant. Five digenic interactions were det ected in another population, and the additive×dominance (or dominance×additiv e) interactions were predominant. No dominance×dominance interactions were foun d in either populations. It was also found in each population that 2 QTL for PH were in good accordance with QTL for yield traits in terms of the chromosomal lo cation, gene action mode and the direction of dominance and additive effects.