Regulation effects of PP333 on extension of tall fescue(Festuca arundinacea)

Effects of PP333 on shoot extension and root feature of tall fescue (Festuca arundinacea Schreb.) were conducted under insidedoor pot condition.The results showed that, while the concentration of PP333 was from 100 to 1 900 mg/L, it suppressed growing speed, shoot extension, accumulation of aboveground biomass and root growth, elevated root area, volume, rootshoot ratio, tillering and accumulation of underground biomass of tall fescue; and significant correlations existed among these indexes and PP333 concentration. The tillering slowed when the concentration of PP333 over 1 000 mg/L; it had a little effects on extension distance of aboveground,coverage area and aboveground biomass when concentration of PP333 over 1 300 mg/L. The highest underground biomass, root volume and rootshoot ratio were obtained while the concentration of PP333 was 1 300 mg/L.