Researchers at the Hainan Natural Rubber Planting Materials Innovation Base, Institute of Rubber of the Chinese Academy of Tropical Agricultural Sciences, plant the seedlings in Danzhou city. (ZHANG MAO / FOR CHINA DAILY)

Rubber trees are the most frequently planted trees in Hainan. Walking in the land of Qiongzhou, you can often see patches of gum forest. But have you ever wondered how the rubber trees grew? "Rubber seeds are buried in the field, begin to sprout, grow into saplings, and then slowly grow into leafy trees..." In your mind, picture a primitive and traditional method of rubber planting. At the Chinese Academy of Tropical Agricultural Sciences, rubber planting is also pictured.

Experimenters at the Rubber Institute of the Chinese Academy of Tropical Agricultural Sciences measure the packaging of plant growth medium in Danzhou. (ZHANG MAO / FOR CHINA DAILY)

An experimenter at the Institute of Chinese Academy of Tropical Agricultural Sciences does experiments on September 22, 2021. (ZHANG MAO / FOR CHINA DAILY)

On September 22,2021, at the Hainan Innovation Base of New Natural Rubber Planting Materials in Danzhou, experimenters from the Institute of Rubber of Chinese Academy of Tropical Agricultural Sciences induce callus by cultivating rubber tree anthers on the plant growth medium (left) and developing it into a callus that can induce embryos (right). (ZHANG MAO / FOR CHINA DAILY)

Researchers are pictured at the Rubber Institute of the Chinese Academy of Tropical Agricultural Sciences in Danzhou city in Hainan. (ZHANG MAO / FOR CHINA DAILY)

Experimenters at the Rubber Institute of the Chinese Academy of Tropical Agricultural Sciences place the mature rubber tree cell embryo in Danzhou on September 22, 2021. (ZHANG MAO / FOR CHINA DAILY)

Rubber tree embryos are taken at the Chinese Academy of Tropical Agricultural Sciences, in the Hainan Natural Rubber New Planting Materials Innovation Base in Danzhou. (ZHANG MAO / FOR CHINA DAILY)

Researchers from the Chinese Academy of Tropical Agricultural Sciences inoculate plant tissue into plant growth medium on the workbench. (ZHANG MAO / FOR CHINA DAILY)