"Artificial Luminous Plants" is a popular science article, which mainly introduces a bold idea put forward by researchers in the Biology Department of the University of California in the United States in 1983: they tried to transplant a luminescent gene into a plant gene by artificial means, so as to make the plant glow.

In order to realize this fantasy, after careful analysis and research, the research team boldly conceived to transplant the luminescent genes of fireflies into tobacco cells, so that tobacco could grow into luminescent plants, creating the night wonders of the University of California Botanical Garden and further revealing the mystery of life.

Based on the research findings, scientists boldly imagine, put forward hypotheses and confirm the exploration process of hypotheses. At the same time, they opened the scientific door to the mystery of life, with accurate and vivid language, in-depth content and interlocking.

Original text:

Anyone who visits the University of California will always go to the botanical garden of the University to enjoy the wonderful night view. After nightfall, you will see patches of purple-blue fluorescence. Are fluorescent lights flashing in the fields? No, it's because some plants emit fluorescence.

This stems from a bold idea put forward by researchers in the biology department of the University of California in 1983. They tried to transplant some luminescent genes into the genes of plants by artificial methods, so as to make plants glow. In order to realize this fantasy, the research team decided to experiment with tobacco after careful analysis and research.

They imagine implanting the luminescent gene of fireflies into tobacco to make tobacco fluoresce. After understanding the luminescent mechanism of fireflies, they found luminescent genes in firefly cells and a bacterium that can directly infect tobacco, and used them as "carriers" for transplantation. The researchers first used an internal cleavage enzyme to "cut" the luminescent gene in the firefly nucleus; Then ligase is used to "sew" it to bacteria as a "carrier".

After cultivating bacteria for a period of time, let it infect tobacco plants. In this way, the luminescent gene of fireflies was transplanted into the cells of tobacco. When these tobaccos grow up, they become authentic artificial luminous plants. This luminous tobacco created the night wonders of the University of California Botanical Garden.

Scientists create this miracle not only for tourists to watch and explore, but more importantly, they want to further reveal the mystery of life through this research. This biotechnology of transferring genes from foreign organisms into plants is called "plant transgenic technology", and this plant is called "transgenic plant"

After the success of this research, scientists made bold and optimistic assumptions about the future. For example, in the future, there is no need to install street lamps on both sides of the expressway, and rows of luminous plants will be planted. We believe that magical biotechnology will add more beautiful colors to our future life.

Extended data

This is an illustrative article that integrates knowledge and science. Students can learn about the characteristics and origin of artificial luminous plants, the role brought by this scientific and technological invention and its contribution to mankind by reading this article. For the fourth-grade students, there are not many expositions. Learning the accuracy of words and mastering the explanation methods in explanatory articles is the key to learning, and it is also two difficult points in this paper.

In view of the above analysis, in design teaching, we paid attention to the graphic method of examples from the beginning, and studied and applied this method five times in the whole process. After learning this lesson, we can not only understand the graphic method of the examples in this paper, but also apply this method in real life.

At the same time, through independent reading, chewing the essence of the text, internalizing into your own language feelings, in the independent, cooperative and inquiry learning mode, feeling the accuracy of the text, and feeling the magic of science and technology through learning, generating interest in exploring science.

Teaching objectives

1. Understand the meanings of some scientific and technical terms such as "fluorescence" and "bacteria" initially, read the text correctly, fluently and emotionally, understand the cultivation process of "luminous plants" and explore the value of this invention.

2. Through the exploration of "not just", we can understand the accuracy of the words used in the popular science expository and use them by learning the examples in the article.

3. Let students feel the magic of science and technology through learning, stimulate students' imagination and have the desire to explore science.

Teaching focus

Understand the cultivation process of "luminous plants" and explore its existence value.