Objective:To understand the drought adaptation strategy of Rosa persica and provide scien-tific basis for vegetation restoration in the native environment.Methods:The annual seedlings of R.persica were taken as the research object.Five sets of groundwater depths were set at 30 cm(D30),40 cm(D40),50 cm(D50),60 cm(D60)and 70 cm(D70),and root growth and architecture were ana-lyzed by root scanning and other methods.Results:The groundwater depth had a significant effect on the internal connections(a),external connections(v0),total number of connections(Pe),average to-pology length(b),modified topology index qa and modified topology index qb(P＜0.05),but had no significant effect on topology index Ti(P＞0.05),and the modified topology indices qa(0.33-0.73)and qb(0.23-0.88)varied widely.During the whole experiment,the root system always maintained a low branch angle of 50°-60°,but when the groundwater was extremely scarce(such as D70 group and CK group),the root branch angle tended to increase.With the intensification of drought stress,the growth rate of root biomass was higher than that of aboveground biomass;In D60,D70 and CK groups,the number of v0 increased faster than the number of a when the root system of R.persica seed-lings accumulated the same biomass;The growth rate of root branch number in each group was always smaller than the root link number,and the difference tended to decrease with the deepening of drought,all of these indicate that moderate drought could promote root branching.Conclusion:The root architecture of R.persica seedlings could respond to the change of environmental water in time and had strong adaptability.
Rosa persicaRoot architectureTopological indexGroundwater depthsDrought resis-tant
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