%D 2005 %0 ARTICLE %T [ QTLs mapping and genetic analysis of tiller angle in rice ( Oryza sativa L ) ] %J Yi Chuan Xue Bao %V 32 ( 9 ) %P 948-54 %A Yu CY %A Liu YQ %A Jiang L %A Wang CM %A Zhai HQ %A Wan JM %M pub16201239 %X Tiller angle is one of the most important morphological characters that has a significant effect on the formation of rice high-yield population . The tiller angles were measured in a japonica/indica RIL population with 71 lines and a genome-wide chromosome segment substitution line ( CSSL ) population with 65 lines at two experimental sites . A transgressive segregation was observed in both populations . QTL analysis of tiller angle was conducted based on the saturated RFLP marker linkage map and the CSSL graphical genetype . Five main-effect QTLs and three pairs of epstatic loci were detected in the RIL population . A main QTL , qTA-9 , located on chromosome 9 at XNpb108 - C506 , was identified at both experiment sites . The positive allele TA-9 ( I ) on qTA-9 was contributed by indica rice IR24 with 28 . 6% average contribution to variance . Meanwhile , an analysis of CSSL graphical genetypes also showed that there was a positive allele on the IR24 chromosome substitution segment delimited by RFLP marker C609 and C506 with approximate 15 cM interval , which proved the existence of qTA-9 . The TA-9 ( I ) could increase tiller angle by about 15 degrees in japonica Asominori background under the two environments . The measurement of the F1 from the cross between background parent and CSSL AIS68 with TA-9 ( I ) and the analysis of F2 population indicated that the TA-9 ( I ) was an incomplete dominant gene . Genetype x environment interaction ( G xE ) was not widely present except a pair of epistatic loci with 5 . 32% contribution to variance of tiller angles and a relatively small additive effect . The combining action of the additive effect of the genes from both parents and the two-loci epistasis-effect may be responsible for the transgressive segregation of tiller angle in rice population . The value and approach of application of TA-9 ( I ) in hybrid rice breeding program were discussed .