关键词: 果树, 砧穗互作, 解剖结构, 内源激素, 信号传递, 遗传物质交换

Abstract: Grafting，an old plant propagation practice，is still widely used in fruit trees，which can improve horticulture traits，such as fruit yield and quality，abiotic and biotic stress，and scion phenotypes. The research progresses on the interaction between scion and rootstock in fruit trees were reviewed in this paper，and their limitation and promising application prospect were also summarized at the end. Previous studies have shown three aspects as follows.（1）Grafting compatibility required for plant cell-to-cell trafficking and communication via the intercellular connections. The physiological and biochemical metabolisms between rootstock and scion also have certain impacts on graft healing.（2）The interaction between scions and rootstock may involve reducing the size of the root system，or the graft junction itself may restrict the flow of water，nutrients and minerals. Endogenous hormone can modify plant growth and increase stress resistance. Some of the proteins and RNA are involved in long distance transmission signal regulating the plant development.（3）Graft hybridization provides a new direction for fruits breeding. Understanding the interaction between scions and rootstock will shed light on graft compatibility and may help us to understand the potential signals regulating growth or stress resistance. In addition，we should illustrate how the endogenous hormone regulates healing progress and nutrient transfer of grafted union. Also，the molecular mechanism of long distance transmission signals and genetic exchange between scion and rootstock is needed to be clear in the future.

Key words: fruit trees, rootstock-scion interaction, anatomy, endogenous hormone, signal transduction, genetic exchange