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CROP BREEDING & GENETICS

The Identification and Mapping of a Tiller Angle QTL on Rice Chromosome 9

^a State Key Lab. for Crop Genetics and Germplasm Enhancement, Jiangsu Plant Gene Engineering Research Center, Nanjing Agricultural Univ., 210095 Nanjing, China
^b Institute of Crop Science, Chinese Academy of Agricultural Sciences, 100081 Beijing, China

^* Corresponding author (wanjm{at}njau.edu.cn, wanjm{at}caas.net.cn).

Tiller angle is an important component of plant architecture in rice even though little is known of its mode of inheritance. A quantitative trait loci (QTL) analysis based on a set of recombinant inbred lines extracted from an indica x japonica cross identified a major effect locus (designated qTA-9a) on chromosome 9, which was expressed in two independent environments. The qTA-9a allele derived from the indica parent IR24 increased tiller angle. This QTL was validated in a set of chromosome segment substitution lines involving the same two parental lines. A high resolution genetic map was constructed from a large secondary F₂ population and anchored to the genomic sequence of rice. The QTL was narrowed to a 65-kb physical region, inclusive of eight putative genes. We have provided the basis for positional cloning of qTA-9a and have developed markers for a major tiller angle QTL.

Abbreviations: CSSL, chromosome segment substitution line • DH, doubled haploid • InDel, insertion–deletion • LOD, log of odds ratio • PCR, polymerase chain reaction • PIN, P value for entering variables • POUT, P value for removing variables • QTL, quantitative trait locus (loci) • RFLP, restriction fragment length polymorphism • RIL, recombinant inbred line • SSR, simple sequence repeat