Analysis of Quantitative Trait Loci for Ratooning Ability in Rils Population of Rice

Tillering and secondary stems in graminea plants are permanent characters, whereas there were being food matters and proper temperature for regeneration. Ratooning or regeneration phase is explained to remain of plant for growing in next season. Recombinant inbred lines (RILs) consisting of 80 lines, derived from a cross between Hashemi and Nemat were used to analyze the genetic basis ratooning ability of rice. Recombinant inbred lines were tested with 177 polymorphic microsatellite markers. Linkage map were constructed with 170 microsatellite markers and its total lengths was 1590 cM which the mean space between markers was 9.3 cM. Using of Inclusive composite interval mapping (ICIM) method, 14 QTLs were detected on chromosomes 1, 3, 5, 6, 7, 8 and 11 for the panicle number, hundred grain weight, fertility percentage and grain yield of ratoon. Among these mapped QTLs, qpfr1for panicle number, qgwr1ýþ þfor hundred grain weight ýand qfpr1ý for fertility percentage of ratoon ýý, controlled 25.12 %, 23.46 % and 22.64 % of the phenotypic varianceýþ,þý respectively.ý The qyr6ýþ þwas the major QTL for grain yield of ratoon on chromosome 6, controlled 19.95 % of the phenotypic varianceý. One new QTLs were identified for grain yield of ratoon which was located on chromosome 8.