Determination of genetic structure of agronomic rice traits using classical and molecular approach

In order to evaluate of genetic structure of an Iranian rice population using means analysis, P1, P2, F1, F2, BC1 and BC2 generations belong to Tarommahalli × Khazar cross planted as RCBD design with three replication in Gonbad High Education Center at 2008. Grain weight per plant, biomass, panicle lengh, plant height, flg leaf length, and width and branches number were recorded. Negative genetic parameter (F) was detected for grain number, panicle number, panicle exertion, flag leaf width. This showed that genes controlling of grain number, panicle number and flag leaf width are dominant in Tarommahalli and genes controlling of panicle exertion is dominant in Khazar. Gene action was over dominance for grain weight, days to heading, flag leaf width, branche number and biomass. Significant additive effects were recorded for biomass, days to heading, grain number, flag leaf length and width and branche number. In order to evaluation of molecular structure of agronomic traits in F2:4 population, linkage map was provided using 74 polymorphic microsatillate markers and 192 individuals. qWG-8 (grain weight), qHE-8 (plant height), qHD-10 (days to heading), qPL-1b, qPL-3 and qPL-4 (panicle leanght), qBR-8b and qBR-1b (branche number) were detected as major effects that explained 22.17, 26.25, 15.29, 25.73, 21.97, 22.23, 21.93, 20.56 and 22.94% of the total phenotypic variations. QTLs related to grain yield, days to heading and panicle exertion overlapped in RM1553-RM7424 interval. Two methods were showed that additive effect is important for controlling of days to heading and branche number, so, QTLs of these traits are useful for marker assisted selection.