Conventional breeding of rice generally refers to systematic breeding and cross breeding. The systematic breeding is based on the existing breed populations. According to the local breeding objectives, the selected individuals with good variability that differ in some traits and populations are selected, cultivated, compared, and identified to obtain new varieties. In the cultivar population, individuals with traits that are mutated may produce genetic mutations. The other species may be hybridized with other natural traits or may be mechanically mixed. Cross-breeding is based on the goal of breeding, and two or more hereditarily different varieties or materials are to be detasseled by hand, and then either emasculated by a warm soup or excised by a cutting method. Artificial hybrids are then carried out, and selection breeding is carried out from generation to generation in hybrid offspring to develop new varieties. The new varieties selected through systematic breeding and cross breeding are conventional rice. The three-line breeding of rice must be a method for the necessary breeding of new varieties of the male sterile line, the male maintainer line, and the male restorer line. Conventional breeding and three-line breeding are complementary breeding methods. Breeding maintainer and restorer lines also require systematic breeding and cross breeding. If the maintained and restored strains that have been selected are stable and high yielding in the local area, they can be used as a variety in production. For example, they have won national awards such as 滇陇201, 滇 502, and 滇 408. They are both conventional breeds, they can be self-producing and self-cultivating, and they are also the maintainer and restorer in the three-line breeding. Therefore, the conventional rice breeding and the three-line breeding are the same, and the conventional breeding methods are further developed and extended in utilizing the sterility of crops. With the deepening of the three-line breeding, while obtaining excellent hybrid combinations, along with the creation and improvement of maintainer lines and restorer lines, more excellent conventional varieties will also be obtained. In the scientific research process of three-line breeding varieties, two-line breeding methods have emerged, namely, different maintenance lines, with only sterile lines and restorer lines. The basis of the two-line method is the discovery of light-sensitive sterile lines and moisture-sensitive sterile lines. It has been predicted that the two-line method will replace the three-line method of breeding. Since people currently cannot control the natural conditions for rice growth, humidity and light have a certain degree of change at the same time each year in the same cropping area. They are seeded with sterilized materials that are affected by humidity and light, once the humidity is As the light changes, the purity of the produced seeds will be greatly affected, which will also affect the yield of hybrid rice. The location conditions for two-line seed production are very strict and are far less extensive than the three-line method. Therefore, the use of two-line law in Yunnan is limited to Shuifu County. Some people also propose a series of laws. There is no need to maintain the department and the restoration department. In fact, it is the conventional system of profit-making. There is no maintenance system or restoration system for conventional varieties.
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