Study On Drought Resistance For Some Varieties Rosa Plants

Rosa .L plants is Adaptable. In the meantime ,Rosa .L plants is continuing for long time .They are used widely in aspects of landscaping ,city greening and soil and water conservation .In the wake of the contradictions between garden construction and lack of water resources , the study of drought resistance to Rosa L.is the important foundation that cultivates new varieties with strong resistance against drought.The drought resistance to the different genus plants is different and the resistance against drought to different varieties is also distinct .The article includes 9 kinds of rose that were experienced respectively by the water stress .During the time of controlling water, every variety was tested in the way of protection enzyme activity, leaf water potential and chlorophyll fluorescence analysis. In the meantime, we carry on the effective water use efficiency and a series of photosynthesis physiology tests to various varieties .According to the response and result of the experiment ,analyze the varieties reaction of shape, physiology and biochemistry indexs in the varying degree .Finally ,use the average subordinative function method to sum to the combating drought correlation each target summation .It is concluded that the drought resistance of Rosa species from the strongest to the weakest were as follow: Iris bloudowii Ledeb. Rosa beggeriana Schrenk >紫叶蔷薇> Rosa chinensis. Var.semperflorens >四锦>黄和平> Rosa xanthina Lindl. > Rosa banksiae Ait > Rosa rugosa Thunb > Rosa hunb. At last, sieve a few anti- drought strongly roses .