现在，如果听说有两种不同的植物结合到了一起，我们也许马上就会想到现代生物技术。但嫁接的落后技术仍然是农业基因工程中非常重要的一张形式。
许多种植物都不是直接由种子长成，而是由现有植物的一部分生长而来。农民们从一种植物上切下分支或幼苗，然后把这些年轻的生长体放到另外一种同科的植物上。
被嫁接的分支或幼苗称作接穗。接受嫁接的植物称作根茎。
随着时间的推移，来自两个植物上的部分会一起生长。被嫁接的植物开始长出接穗的树叶和果实，而不是长出根茎的树叶和果实。
嫁接的方式有很多种。例如，劈接法需要接穗上保留着几个幼苗。接穗的底部被切成字母V的形状，根茎上也要切除一部分放接穗。
然后，接穗要被完好地放在根茎的切口上。一种称作生长介质的物质会被放在接口处保持湿度、促进生长。
These days, if we hear about two different plants being combined,the first thing wo might think about is the modern biotechnology. But the low-technology of grafting process remains an extremely important form of genetic engineering in agriculture.
Many kinds of plants are grown not from seeds, but from parts of existing plants.Farmers cut branches or buds from one plant, and place them to a related kind of plant. Branches or buds being grafted are called sicons. Plants that accept graft are called rootstocks.
Over times, parts from two plants grow together. Grafted plant starts producing leaves and fruits of the scion, not the rootstock.
Graft can be cut in several ways. Cleft graft, for example,requires a scion with several buds on it. The bottom of the scion is cut in the shape of letter V, a place cut in rootstock to place scion.
And then, scion can be securely grafted to the cut in rootstock. A kind of material , called growrh medium, is put on the joint to keep it wet and help growth.
