Study On The Phylogenetic Relationship And Characteristics Among Chinese Cucumber (Cucumis Sativus L.) Commercial Variety

Cucumber is the most widely cultivated region, the highest total, the bulk of the best economic benefits of vegetables, consumers like eating and rearers like planting. Cucumber originated in the Himalayas East India tropical moist forest zone,be strict to the environmental condition request, Plant disease is one of primary factors which threatens the production of cucumber and cause the output to reduce and the quality drops, At the same time, The genetic background of cucumber cultivars in production becomes narrower and narrower because of natural genetic erosion and variety hybridization. At present, there are few selection of varieties and production resources of the technical system , how to improve the marketability of vegetables is one of the problems which the majority of vegetable breeding workers and the grave facing to. From the point of view of breeders, selecting a new variety always has longer time than the current market consumption changes, the variety of existing resources evaluation, selection is basic of the work of the breeding,also is a quick method of selection .Carried on the analysis to the Chinese present cucumber 264 main commercial variety's basic information, finally demonstrated that our country's cucumber's main production area mainly distributes in Shandong, Henan and Hebei, occupies the cucumber total sown area 36.67%. The main ecology type was still the North China cucumber. From the main agronomic characters including seed, fruit, adult plant, leaf blade as well as with ripe related first female flower location of knots looked that our country's cucumber resources' multiplicity is rich. May provides the material support to its deep research for our country cucumber's production and the breeding.Carried on the relevant analysis to the investigation morphological character and the disease resistance, the result that the ripe time related first female flower location of knots and other investigation morphological characters almost have no relevace. The fruit characters, the leaf characters and the adult plant growing trend are complicatedly reletvant. Looking the ralationship from the agronomic characters and the disease resistance, the disease resistance and the morphological characters related few.This article carries on the frosty mildew, powdery mildew, the bacterial angular leaf spot and wilt disease resistance appraisal analysis with the Chinese cucumber present promotion's 233 varieties, with a view to a comprehensive and systematic understanding of China cucumber varieties existing resources's four kind of plant disease's resistant performance. Generally speaking, the Chinese cucumber commercial variety's compound disease resistance is bad at present, lacks more than three diseases fine varieties, such as in the appraisal of 233 cucumber germplasm, the anti-four kind of plant disease's variety only has 4, accounts for 1.7%, the anti-three kind of plant disease's variety has 20, accounts for 8.58%. Speaking of the sole plant disease, the existing commercial variety is better to resistant to powdery mildew, followed by the downy mildew, angular leaf spot, the weakest is Fusarium wilt disease, but high resistance to Fusarium wilt varieties relatively high. Obviously, the multiresistance variety selective breeding is one of Chinese cucumber breeding essential targets; innovation and breeding more resistance and high resistance to downy mildew, powdery mildew and bacterial angular leaf spot resistance to the fine-resistance of the material which is the focus of the work in the future Breeding work..The combination of morphological features, agronomic traits and disease resistance of identification of these 264 cucumber germplasm resources genetic diversity and identification of resistance analysis, selected 74 excellent representative of the generation of hybrid varieties, using morphological marker Screening has been good on 74 of cucumber quality materials cluster analysis, the result that 74 materials is gathered 3 kinds, looking from the result that the South China cucumber, the North China cucumber and the pickled cucumber were good to separate out.The North China cucumber are mostly from Shandong and Tianjin, the South China type cucumber are mostly from Northeast and Guangdong, the Pickled small cucumber mainly come from the US, through the cluster analysis result showed that the North China type cucumber varietiy's the heredity distance is nearest between the three ecological types, the South China type cucumber's heredity distance is followed North China cucumber, the picled small type cucumber's heredity distance is farthest.In addition, this experient screens 36 high quality and suitable production fron the 259 cucumber germplasms.