Molecular markers in horticultural plants are mainly used in plant breeding. Using molecular markers can not only identify and screen excellent germplasm, analyze the genetic relationship between parents and maintain and utilize genetic diversity, but also select molecular markers, transfer and aggregate target genes and many other links, such as plant genetic relationship analysis, variety registration, patent protection, somatic hybrid identification and new variety protection. Broadly speaking, molecular markers can not only effectively manipulate the target traits, but also aggregate favorable genes according to the in-depth understanding of the genetic composition of the target traits and accelerate the process of plant breeding. See related books on biotechnology and plant breeding for details.