QTLs controlling panicle and panicle base vascular bundle characteristics were detected in 176 F2 population derived from a cross between super japonica rice ‘Shennong265’ and japonica rice cultivars ‘Lijiangxintuanheigu’.

A doubled haploid population, consisting of 81 DH lines derived from the F 1 hybrid of a cross between an indica cultivar and a japonica cultivar, was used to map quantitative trait loci (QTL) controlling numbers of vascular bundles in peduncle, primary rachis branches and the ratio of vascular bundles to primary rachis branches (V/R ratio).

The results showed the subspecies characteristics and vascular bundles characteristics all showed continuous variation and genetic characters of quantitative characteristics.