Novel QTL for lodging resistance, PRL4, improves physical properties with high non-structural carbohydrate accumulation of basal culms in rice (Oryza sativa L.)

Resistance to lodging, an important problem in rice production, has three types: low plant height, strong culm, and high strength of the lower part plant. The determinants remains unclear, compared with height culm strength. This study identified a new genetic factor involved part, as assessed by pushing resistance, using chromosomal segment substitution lines (CSSLs) clarify functional analysis CSSL introgression line (IL) harboring quantitative trait locus (QTL). QTL for increasing resistance on chromosome 4, PRL4, which was not related days heading. PRL4 showed increased physical basal but decreased filled grain ratio weight. IL developed backcrossing this CSSL, improved strain until breaking under compression, did decrease yield traits. These accumulation non-structural carbohydrate (NSC) at fully ripe stage. Thus, control NSC culms may improve enhancing toughness ductility.