Silicon Regulation Of Bluegrass The Change Rule Of Drought Resistance And Physiological Research

Bluegrass is a perennial herb, which have dark green leaves, beautiful leaf and plantmorphology. The turf formed by the bluegrass is strong and elastic, thus making it the world’sexcellent and extensive use of cool-season turfgrass. In this study, with the present experimentalconditions, Siberia bluegrass to was used as the test material, compared with ’midnight’ bluegrassintroduced from the United States. After applications for different concentrations of siliconfertilizer to bluegrass foliar, with drought and complex water treatment method, the morphologicaland physiological characteristics of indicators were measured, aiming at providing a theoreticalbasis for the cultivation of domestic bluegrass country development and utilization of resourcesand their varieties. The results were as follows:1.Exogenous silicon helped maintain the two bluegrass varieties’ normal growth conditions,reduce the variations of the leaf length, leaf width, and color change under drought stress in orderto maintain the bluegrass normal ornamental value, and the foliar application400mg/LNa2SiO3·9H2O alleviated the best. According to Siberian bluegrass leaf length, leaf width andcolor indicators, its turf application value was lower than midnight bluegrass. The higher siliconconcentration increased underground and aboveground biomass ratio, and promoted the growth ofbluegrass roots.2.Foliar applications of silicon fertilizer had a positive effect on the twp bluegrass’s moisturephysiological changes, including effectively improved water use efficiency, maintainedevapotranspiration, increased use of water in the soil in order to reduce the damage caused bydrought stress, improved rehydration speed of recovery, meanwhile, the silicon had a positiveeffect on membrane damage and membrane lipid peroxidation of the bluegrass two varieties, andthe conductivity and MDA content decreased. Among the different concentrations of siliconfertilizer,800mg/L Na2SiO3·9H2O applied to the Siberian bluegrass and400mg/L Na2SiO3·9H2O to’midnight’ bluegrass were the best.3.Under drought stress, foliar applications of silicon fertilizer could slow the rate of decline ofthe two kinds of bluegrass soluble protein, and promote the accumulation of proline and themitigating effects sequentially were400mg/L>800mg/L>200mg/L. The silicon fertilizercould delay the soluble sugar content increasing, reduced the inhibition of photosynthesis. Siberia bluegrass under800mg/L Na2SiO3·9H2O and midnight bluegrass under400mg/L Na2SiO3·9H2Owere the best.4.Silicon fertilizer on two varieties of bluegrass had similar results, including chlorophyllcontent, net photosynthetic rate, stomatal conductance, transpiration rate, intercellular CO2concentration, Rubisco enzyme activity, reducing the impact of drought stress on bluegrassphotosynthesis. Mitigation effects sequentially were400mg/L>800mg/L>200mg/L.5.Under drought stress, different concentrations of silicon fertilizer could effectively slow downthe bluegrass glutamine synthetase, the rate of decline of sucrose synthase and sucrose phosphatesynthase.400mg/L alleviated with the best results,800mg/L with the second, and200mg/L couldease, but with minimal effects.6.Under drought stress, after the foliar applications for different concentrations of siliconfertilizer, the two bluegrass C/N reduced, compared to the samples with no silicon fertilizerapplied. And the mitigate stress damage effect followed by400mg/L>800mg/L>200mg/L.