SRAP And SCAR Molecular Marker Linked To Gynoecious Loci In Cucumber

Cucumber (Cucumis sativus L. )is a kind of annual diplontic rattan plant, with the highest yield under protective cultivation, which is usually cross pollinated and is one of currently 10 series widely cultivated vegetables. The traditional breeding methods can only select from the phenotype not from genotype or molecular level. And the phenotype is the result from the interactions between genotype and environment. The phenotypes of the same genotype differ in every generation because the environment in every generation is not totally unanimous. So a large number of cucumber have to be planted as possible as we can in the traditional breeding for obtaining the better genotype. The traditional breeding is a very useful method but it is too difficult to breed better variety with optimum genotype combination. Therefore the breeders have been searching for new breeding ways. In recent years, with the development and application of molecular biotechnology, the marker-assisted selection can make up the traditional breeding method, which is very important for the marker-assisted selection of cucumber. Gynoecious loci in cucumber has important role in simplifying the hybridization breeding program, decreasing the cost of produce the seeds, improving the seed quality and increasing the productivities. But as a result of the cucumber sex hereditary basis complexity and the research lag, it is difficult to transfer Gynoecious loci in cucumber and takes time long. The development of Mark-assisted selection shorted the time of traditional breeding. F spot of controlling cucumber female sex is partly dominanted, playing an important role in female development. If a molecular marker with close linked to this spot had been obtained, we can select or shift pure female character fast and accurately, shorten breeding time and accelerate the acquisition of female strains with marker-assisted selection. Meanwhile, the molecular marker closed linked to female character will lay the foundation on cloning this gene which controlling femail character and further researching cucumber sex differentiation molecular mechanism. The main findings as follows:...