Maintain the excellent characters of plant parents and accelerate plant reproduction.

The cambium of scion and rootstock is closely combined.

Produce a large number of plants in a short time? Against plant viruses? Cultivate new varieties with high quality and high yield

Analysis of test questions: The way plants reproduce with vegetative organs such as roots, stems and leaves is called vegetative reproduction. For example, when strawberries, potatoes and deciduous leaves take root and propagate, new individuals are directly produced by the mother, and the combination of bisexual germ cells is not needed. This kind of reproduction is called asexual reproduction, and vegetative reproduction is the most common asexual reproduction. Common ways of asexual reproduction are cutting, grafting and layering. The speed of asexual reproduction is fast and the materials are easy to obtain. Grafting refers to grafting the bud or branch of one plant to another plant, so that the combined two parts grow into a complete plant. When grafting, the grafted buds or branches are called scions, and the grafted plants are called rootstocks. When grafting, the cambium of scion and rootstock should be closely combined to ensure survival, because the cambium has strong splitting ability and can continuously divide to produce new cells, so that scion and rootstock can grow together and survive easily. Tissue culture of plants refers to cutting the stem tips, stem segments or leaves of plants into small pieces under aseptic conditions and culturing them on special media. Through cell proliferation and differentiation, it gradually developed into a complete plant. Tissue culture belongs to the category of asexual reproduction. Using tissue culture technology, a large number of new individuals of plants can be cultivated in a short time, and the harm of plant viruses can be prevented, which greatly improves the efficiency of agricultural production.

Comments: This question examines some reproduction methods of plants, which is generally difficult. Master the concept of asexual reproduction and the precautions of these reproduction methods and solve the problems.