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The lawn industry has developed very rapidly recently. Researches about lawn grass are more and more widespread, involving physiological biochemistry, heredity breeding, molecular biology, environmental protection and so on. Along with the increased costs of fuel, machinery and manpower, plant growth regulators receive much more attention as an important way of reducing the lawn maintenance expense, and improving the lawn quality. Plant growth regulators can be used to speed up the level ground speed, delay the plant growth, reduce the times of trimming, improve the lawn grass quality, enhance the resistance of stress and so on, thus reducing the overhead charge and enhancing the economic efficiency. Therefore the research on regulative function of plant growth regulators to lawn grass has very important practice significance.To study effects of S-3307, Pix and PCPA on plant growth and physiological characteristics, this article took Lolium perenne Lam. and Festuca arundinacea Schreb. as experimental materials by spraying through the leaf surface. The findings indicated that, after treatments with 50mg/L S-3307,50mg/L S-3307+50mg/L PCPA as well as 50mg/L S-3307+100mg/L PCPA, plant height of perennial ryegrass and tall fescue were both obviously reduced, slowed down regeneration speed, promoted tilling, and obviously enhanced root-shoot ratio and chlorophyll content, helpful to increase the value of ornamental and improve the lawn quality. Pix (300mg/L) also had obvious effect on reducing the plant height of perennial ryegrass, but had a trend of improving the growth of ryegrass with the concentration of PCPA going up. Tall fescue wasn’t dwarfed after treatments with 300mg/L Pix,300mg/L Pix+50mg/L PCPA and 300mg/L Pix+100mg/L PCPA.Perennial ryegrass treated with 50mg/L S-3307,50mg/L S-3307+50mg/L PCPA and 50mg/L S-3307+100mg/L PCPA, the cell electrolyte leakage and the content of MDA decreased, and the proline content was increased uncoordinatedly, simultaneously also enhanced the activity of SOD, POD and CAT, in which the soluble sugar content and the SOD activity were highest after treatment with 50mg/L S-3307, the proline content and POD activity were highest after treatment with 50mg/L S-3307+100mg/L PCPA. The cell electrolyte leakage and the content of MDA of ryegrass decreased after treatment with 300mg/L Pix, and had an ascending trend with the concentration of PCPA going up. The activity of POD and CAT in ryegrass leaves were enhanced as well, in favor of improving the resistance.Under the non-adverse circumstance, the cell electrolyte leakage and the MDA content in tall fescue leaves were reduced after treatments with 50mg/L S-3307,50mg/L S-3307+50mg/L PCPA and 50mg/L S-3307+100mg/L PCPA, but the treatments of 300mg/L Pix,300mg/L Pix+50mg/L PCPA and 300mg/L Pix+100mg/L PCPA all enhanced the cell electrolyte leakage and the MDA content, but there was not remarkable difference among each processing. Each processing obviously reduced the net photosynthetic rate in tall fescue leaves, the intercellular CO2 concentration decreased too, and the transpiration rate also obviously dropped. The processing of 50mg/L S-3307 and 300mg/L Pix obviously suppressed the stomatal opening of tall fescue leaves respectively, causing it to change small, but effect of other treatments on the stomatal conductance in tall fescue leaves was not obvious.
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