Studies On The Relationship Between PAL Activity, Lignin Content And Grwoth During Seeding Stage Of Alnus Cremastogyne Clones

This thesis deals with 6 clones ofAlnus cremastogyne .Therandom complete block design (rcbd) is adopted in the test and the method of cuttage is involved in cultivating seedling .The main researches include : The variation law of PAL activity .soluble-protein content, peroxide activity, lignin content Jigningrowth, cellulose content .cellulose growth, night-growth, root-collar growth of the 6 clones during growing periodicity ;The variation degree among the 6 clones in PAL activity, soluble-protein content, peroxide activity, lignin growth , cellulose growth , bight-growth , root-collar growth ;The correlation degree of PAL activity, soluble-protein content, peroxide activity , lignin growth , cellulose growth , bight-growth , root-collar growth ; The identification of the most correlated index with night-growth and root-collar growth ; The distribution of PAL activity , soluble-protein content, peroxide activity , lignin content, cellulose content in Alnus cremastogyne clones and the correlation between PAL activity.soluble-protein content , peroxide activity, lignin content, cellulose content and the height of sample; Moreover, a summary is made about the current developing situation and trends of PAL lignin growth, and author's thoughts about the improvement in this field are also put forward.The research result indicates: The law of PAL activity lignin growth bight-growth of the 6 Alnus cremastogyne clones during seeding stagefollowed with low-high-low pattern; The maxim point of PAL activity,lignin growth,hight-growth reached in early September, There exists difference in time which reach the maxim point of PAL activity,lignin grownXhight-growth among the 6 Alnus cremastogyne clones; The variation degree of PAL activity,lignin growmjiight-growth of each Alnus cremastogyne clones is consistent. It is found that there exist significant or very significant correlation for PAL activityjignin growthjhight-growth in each Alnus cremastogyne clones; PAL activity can be used as the biochemistry index for the high-speed growth Alnus cremastogyne clones selection; PAL activity.soluble-protein content, peroxide activity of in each Alnus cremastogyne clones is falling gradully from top to down ;moreover , the reduction between the first two section is very significant; sample-radixjignin content,cellulose content is rising gradually from top to down; PAL activity,soluble-protein content, peroxide activity have significant negative correlation with the height of seedling; that identity the positive correlation between PAL activity .lignin growuXheight-growth and height of seedling has obvious affection to PAL activity again.It is the first time that research has been conducted on the relation between PAL activity,lignin growth and height-growth , The result prove the important role of cell wall during plant growth and that can be used as science proof to select high-speed growth clone.