Research On Cold Resistance And Cold-resistant Measures Of Paeonia Rockii

The Paeonia rockii group is the most cold-resistant group in the existing peony groups. Because Harbin is cold area,the Paeonia rockii needs to guard against the cold environment with cold-resistant measures to be able to survive the winter.In order to be applied scientifically in cold region and resources of cold resistant breeding,this topic takes the two years seedlings and Paeonia rockii varieties which have been introduced three years as experiment material,has carried on cold resistance and the cold- resistant measures research of Paeonia rockii in cold region.The result is as follows:1 The Paeonia rockii seedling's excised branch and intravital branch display the extremely remarkable relevance(P＜0.01) on electrolyte leaching rate,organization browning index and freeze injury index's determination.The correlation index is 0.956,0.964 and 0.985 respectively; The cold resistant ability of Paeonia rockii seedling's branch is -22℃～-24℃under laboratory condition.2 10 Paeonia rockii varieties' cold resistant ability sorting is 'Yaochi Jiunv'＞'Xiongmao'＞' Shusheng Pengmo'＞' Xinggao Cailie'＞' Mohai Yinbo'＞'Xuehai Feihong'＞' Lanyun'＞' Heilong Tan'＞' Wunv'＞' Pingfen Qiuse', which is on basis of Quality synthetic evaluation.3 Taking MDA content,soluble sugar content,soluble protein content,dissociation proline content and SOD enzyme activity change as the bases,explain the cold resistant differences among Paeonia rockii varieties from the cold resistant physiological mechanism,and point out the correlation between various physiological targets and the cold resistant of Paeonia rockii varieties.Furthermore,the soluble sugar content,the soluble protein content and the SOD enzyme activity exhibit an extremely positive correlation with the Paeonia rockii cold resistant ability,the MDA content exhibits a remarkable negative correlation with the Paeonia rockii cold resistant ability,the proline content does not exhibit a remarkable correlation with the Paeonia rockii cold resistant ability.4 Using the analytic hierarchy process to the different cold-resistant measures,carry on the quality synthetic evaluation processing to Paeonia rockii varieties watching character the following year.Establish a set of Paeonia rockii's quality synthetic evaluation model in cold region with the analytic hierarchy process(The AHP law).Analyze the 16 appraisal factors, and obtain its several important targets.Its weight value sorting is the flowering season length (28.1%),fresh growing trend(12.0%),bud germination rate(11.8%),flower diameter(10.1%), flower color(7.1%),leaf color(5.4%),deadwood quantity(5.1%),flower quantity(3.5%), flower shape(2.4%),flower fragrance(2.4%),spot color(2.4%),leaf shape(2.2%), reproduction coefficient(2.2%),flowered ornamental(2.0%),flower displaying(1.2%) and plant type(1.2%).Through the model evaluation,it is divided into five ranks of the Paeonia rockii varieties' watching value in next year:LevelⅠ(=4.0):Type of extremely high ornamental value;LevelⅡ(4.0-3.5):Type of high ornamental value;LevelⅢ(3.5-3.0):Type of relative high ornamental value;LevelⅣ(3.0-2.5):Type of general ornamental value;LevelⅤ(=2.5): Type of inferiors ornamental value.5 Effect sorting for cold-resistant measures is buried in the soil,leaves filled into the grass curtain,plastic bind outside the grass curtain and grass curtain independent.It indicates that the optimization measure of Paeonia rockii cold-resistance methods is buried in the soil,as well as the whole cold-resistance method is superior to the independent cold-resistant method. Referenced means are provided to winter cold-resistance where Paeonia rockii is introduced on large-scale in cold region.