植物生长调节物质对山核桃嫁接的效用

采用3种植物生长调节物质（IAA、6－BA、GA1，3）以3种浓度对山核桃3类接穗（一年生枝、生长枝、结果枝）的嫁接进行正交田间试验（L273^3)，经方差分析表明：试验的3种物质中，IAA具显作用，F值分别为2．91、2．94、3．49，都超过了F0．10临界值；6－BA没有效果，赤霉素在结果枝的嫁接中与生长素交互起显作用。因此，在山核桃嫁接时，外源IAA对山核桃嫁接起主导作用，不同时间的处理，激素对嫁接的效果不同。

The Effect of Plant Growth Regulators on Carya cathayensis Grafting

Carya cathayensis ,native to China,is an important species for dried nuts and oil,with high nutritional and economic values.At the present it is mainly propagated by seed,with a long juvenile stage and late fruiting stage,so it needs a long time before getting profit.For decades,researchers have carried out a series of studies on the propagation techniques of this species,especially the grafting techniques,but no great achievements have been made till now.The production of Carya cathayensis on large scale is severely restricted by the very low grafting survival rate.For this reason,plant growth regulators had been taken in order to improve the grafting survival.Using three plant growth regulators(IAA?6 BA and GA 1,3 ),three concentration to deal with three types of scion(seedling stem,nourishing shoots,fruit productive branches)for grafting.Field test of direct cross(L 27 3 3)showed that IAA had a significant function.In the graft of seedling stem as scion,the F value was 2.91,which is over F 0.10 .Meanwhile,the F value of nourishing shoots and fruit productive branches as scions were 3.94,3.49 respectively,which were all over F 0.10 .Gibberellin mixed with IAA showed that they promoted each other on fruit productive branches grafting.6 BA had no effect on its grafting.So IAA was the most important one of the three regulators in the grafting.However,the effect of growth regulators changed when it was used in different time.The effective grafting date was before the leaflet developed.