Mother Tree to Pruning,Bud Picking,and BA Treatment

[Objective]In order to provide reference for the management of the scion-seed tree nursery of Picea balfouriana.[Method]In the Shaba National Spruce Germplasm Resources Collection and Preservation Repository,Taking the 8-year-old Picea balfouriana cutting braches mother tree as the research object,Using a completely randomized block test,We studied the effects of prune cutting branches of ortets(fusiform pruning,fusiform pruning+bud picking,fusiform pruning+branch retraction withe different intensities),6-BA concentration(0,300,600,1000 ㎎·L-1),and spraying time(before bud germination,30 days of new shoot growth,and after the formation of new terminal buds)on the yield of harvestable cutting branches,the quality of cutting branches and number of winter buds of cutting branches ortets of Picea balfouriana in the current year,The data were analyzed using SPSS16.0 for analysis of variance,multiple comparisons,and principal component analysis.[Conclusion]There was no significant difference(P>0.05)in the effect of different concentrations of 6-BA on the length of harvestable cutting of ortets of Picea balfouriana in the same year,except for the 6-BA concentration×Effect of treatment time on the diameter of the base of the harvestable cutting and 6-BA concentration of the harvest ortets in the current year×treatment time×The interaction effect of ortets pruning on the number of winter buds of ortets for cutting is not significant(P>0.05),The effects of ortets pruning,6-BA concentration and treatment time on the diameter of the base of the harvestable cutting,yield of cutting,and number of winter buds of the ortets in the same year were significantly different(P<0.05),and the ortets pruning also showed significant differences(P<0.05)×6-BA concentration,mother tree pruning×6-BA treatment time,6-BA treatment time×6-BA concentration×The pruning of ortets has a significant interaction effect on the traits such as the diameter,length,and yield of the harvestable cuttings at the base of the cutting in the current year of the Sichuan spruce harvesting ortets(P<0.05).Different concentrations of 6-BA can significantly improve the quality,yield,and number of winter buds of the ortets that can be harvested in the same year;The effect of spraying 6-BA before sprouting and after 30 days of new shoot growth on promoting the length and diameter of the ortets of harvestable cutting is better than that after the formation of new top buds.After fusiform pruning and sprouting,the ortets of Picea balfouriana was sprayed with 300 ㎎·L-1 of 6-BA before sprouting to promote the growth of the diameter and length of the harvestable cutting base.The diameter and length of the cutting base reached(4.71±1.38)mm and(16.71±4.99)cm,respectively.The diameter of the cutting base was 0.99 times that of the control(2.37±0.48 mm),and the cutting length was 25.17%higher than the corresponding control(13.35±1.69 cm);Spraying 6-BA with a concentration of 1000 ㎎·L-1 on the growth of new shoots for 30 days resulted in the highest number of harvested cuttings and winter buds of the ortets,reaching(123.0±7.1)branches plant-1 and(348.5±89.8)Number·plant-1,respectively.After 30 days of new shoot growth,spraying 6-BA on the cutting of trets significantly increased the number of fusiform pruning(88.6±34.8 branches plant-1)compared to 28.78%and 31.65%before bud germination and after the formation of new top buds(P<0.05).The number of winter buds in the ortets(342.2±84.6 Number·plant-1)was also significantly higher than 17.43%after the formation of new top buds(P<0.05).The spraying time of 6-BA is crucial for improving the number of cutting and winter buds in the cutting ortets that year.The maximum score coefficients for the diameter and length of the base of the cutting ortets in the current year were 0.534 and 0.538 in principal component 1,and the maximum score coefficients for the number of cutting and winter buds in principal component 2 were 0.535 and 0.539.The cumulative variance components of principal component 1 and principal component 2 accounted for 86.64%of the overall variance,which can reflect the majority of information about the cutting ortets.[Result]After fusiform pruning and bud picking treatment,the ortets of Picea balfouriana was sprayed with 300 ㎎·L-1 of 6-BA before bud germination.The quality of the ortet cuttings was significantly improved in the same year,and spraying 1000 ㎎·L-1 of 6-BA after 30 days of new shoot growth could increase the yield of the ortets cuttings and the number of winter buds in the same year.