Effect Of PGRs On Budding And Branching Of Young Pear Trees

Most Pear varieties have strong bud, branching weak, branches opening angle is small,branching late of characteristics, to speed up and become reasonable tree structure andearly high yield bring some difficulties. The engraved bud promote branching is a limitednumber of branches, it consumes the manpower.Using a variety of plant growth regulatorspromote branching of Pear, operation is relatively simple, High efficiency, for therealization of young trees orientation, positioning branching, accelerated young treeforming, advance fruit have important significance. In this experiment, three-year-old XueQing、Ya Li、Hong Xiangsu、Xinli No.7as the test material,in the early spring dormantperiod and summer new shoot vigorous growth. Carried out engraved bud, apply pumpingbranch treasure and the different concentrations and proportion of6-BA and GA3,Researcheach treatment is promoting germination and pumping branch bud effects, Screened outsuitable plant growth regulator concentrations and treatment periods, in order to promotethe pear saplings sprout, pumping branches and accelerating young tree shaping to providereference. The main results as follows:1. Early spring period of dormancy, hydroponic treated isolated branches,bud swellingexposed green in3d, the leaf tip grow around in10d,After rapidly sprouting. Controlbranches, only the upper branches germinate bud.in the lower part is notgerminate. Equalmixture6-BA400mg/kg+GA3400mg/kg and6-BA500mg/kg+GA3500mg/kg,germination rate was significantly higher than the control, it can achieve an effective budsprouting purposes. The fewer the number of processed bud, budding rate is higher, takinglonger branches to deal with fewer than five buds best.2. Hong Xiangsu and Xinli No.7hydroponic isolated by T5（6-BA400mg/kg+GA3400mg/kg）and T6（6-BA500mg/kg+GA3500mg/kg）mixing equal treatment branches,taking long branches, middle branches, short branches, Significantly higher than control,T6treatment of multiple long branch. T6treatment of Hong Xiangsu Pear average branchlength is higher than the control about6.65cm, Xinli No.7higher than the control about9.54cm. Setting the test concentration range, the concentration of plant growth regulatorcomposition, the more pumping growth branch.3. April12-July12,2011painting PGRs ointment, germination is5-7d,15d draw newshoot, smear PGRs lower the concentration, the high concentration of germination processlate in more1.5-2d. Four times compared to the control treatment, there are significant differences. Controlled germination rate decreased. April12, engraved pear buds sprouthave best effect, germination rate reached89.3%. Three varieties germination rateperformance, mixed with an equal amount of PGRs concentration, the germination ratewas gradually increased. May12, T6treated effect onXue qing and Hong Xiangsu. June12,T6treated three varieties sprouting rate reached80%. July12Xue qing and Ya li havegood effect by T5and T6.4. Different segments and different orientations bud branch smear PGRs, the upperbranches bud and the back branches have better germination rate, multi-pumping longbranches, the average branch length of upper branches Than the following grow39.6cm,shoots back under the back longer than the average branch bud21.7cm, lateral bud thanunder the back10.5cm, bottom and backing lower branches pumping buds only Shortbranches.5. Different amount of mixed PGRs ointment promoteYa li、Xue qing lateral budgerminate into new shoot branch.Ya li treated germination rate higher than control53.8%by T9(6-BA700mg/kg+GA3300mg/kg). Two varieties treated as the highest branch byT10(6-BA300mg/kg+GA3700mg/kg).6. Painting Foliage branch terminal buds or Short branches are not germinate dormantbuds, germination rate reached80%, mostly short branches germinated, long branch isfewer.