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Effect of branch bending angle on contents of endogenous polyamines in shoot terminals of apple tree

LüZhenzhen;MA Ling;ZHANG Manrang;College of Horticulture,Northwest A&F University;  
【Objective】To further explore the factors affecting flower bud differentiation of apple,the effect of branch bending on floral formation through the changes of polyamines(PAs)was studied.【Method】In the experiment,Fuji and Gala were selected and high performance liquid chromatography(HPLC)was used to measure the contents of diverse polyamines(Put,Spd and Spm)and their dynamic changes in different shoot terminals at different branch angles(0°,70°,90°,110°)during flower bud differentiation.【Result】Flowering rate was increased when increasing the bending angle,and the contents of Put,Spd and Spm in the whole floral bud differentiation showed an increasing trend with the highest in Spm.The contents of endogenous polyamines in Gala were higher than that of Fuji.PAs contents of spur were higher than that of medium-long shoot.For Fuji,the polyamines contents at 110° were significantly higher than the other treatments,while the best angle for Gala was 90°.【Conclusion】Polyamines involved in floral bud differentiation and PAs concentrations were related to cultivar,branch type and bending angle.‘Fuji'and‘Gala'all showed highest polyamines and flowering rates at the angles of 110° and 90°,respectively.The polyamines contents in floral formation can be regulated by branch bending or polyamines spraying to promote flowering and increase production.
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