Physiology Characteristics In Different Ages Of Basal Branches In Vaccinium Uliginosum In Daxing'an Mountains

There are abundant wildberry in the Daxing'an Mountains,which contains high nutrition and health care value,and are popular with consumers.But we found that Vaccinium uliginosum in Daxing,an Mountains was in wild conditions and old branches were densely distributed,which seriously influenced normal growth,and climate change and extensive picking decreased distribution areas and reserves.Based on which,this study took Vaccinium uliginosum which from three site types in Daxing,an Mountains as our experimental material.Distribution of mineral nutrition and accumulation characteristics of organic substances in leaves and stems of V.uliginosum among different ages of basal branches was clear out by analyzed the contents of N,P,K,Ca,Mg,Mn and organic substances among different ages of basal branches which conceived from the base of bushwood,and the relationship between mineral nutrition and new shoot growth,and the correlativity between olganie substances and new shoot growth were also studied in our experiment;The internal mechanism of the V.uliginosum adaptation to habitat was discussed by comparing anatomical structure difference between V.uliginosum and cultivated blueberry;Tissue structures at different age process were studied in V.uliginosum by analysing anatomical structure characteristics of different ages basal branches,which offered theoretical basis of tending management of V.uliginosum,and were benefical to local conservation and tending management.The results indicated that:1.Six elements showed different patterns in leaves and stems.N,P,K had a tendency to decrease as branches became old,leaves and stems sunk the minimum at S5,S6,reaspectively.The content of Ca was accumulated at old branches,Mg content was higher in leaves' in S1,and Mn had no significant differences among different branches;Canonical correlation analysis showed that the factors of mineral nutrition which effected new shoot growth were differ from the ages of basal branches.In S1,the new shoot was mainly related to Mg in leaves,the new shoot was effected by K,Ca and Mg in stems during S2-S4,the content of Ca in leaves mainly influenced the growth of new shoot.2.Sucrose,soluble sugar and starch content were accumulated in bearing branches(S2-S4),and soluble protein was concentrated in the S1-S4 stage,and content in leaves were higher than stems.Total soluble sugar,soluble sugar/starch in wet land with grass were higher than other site types.Correlation analysis showed that new shoots changes in V.uliginosum were positively significant with soluble protein in stems,and was significantly negative correlation with sucrose in stems.3.Xylem vessel of V.uliginosum were uniformly distributed,and belonged to typical loose material,preserving the original evolutionary characteristics of the plant.Compared with one-year basal branches,perennial basal branches of V.uliginosum have more fibrous cells.The proportion of medulla in perennial basal branches was less than one-year basal branches,and the shapes were different,mostly were similar to triangular or elliptic;In this study,the annual growth ring of four different ages of basal branches decreased with the increase of the branch age.V.uliginosum possessed higher density of palisade tissue,the ratio of palisade tissue and spongy tissue and cell tissue structure tightness compared with cultivated blueberry.4.Comprehensive analysis showed that the content of N,P,K and suger were obviously decreased in old branched of V uliginosum,while Ca increased significantly.The growth of new shoot and growth ring were decreased significantly.By which we concluded that one of the reason that resulted in old was the decline of nutrition so that the growth potential was weak.