Eveluation Of Genetic Characters And Disease Resistance For Egusi Seed And Edible Seed Watermelon Germplasm

Seed watermelon is divided into egusi seed watermelon and edible seed watermelon by the seedcharacteristics.Egusi seed watermelon(Citrullus lanatus sp. mucosospermus var. mucosospermus Fursa)originated in Nigeria, Ghana, et. of Africa and is local wild and semi-cultivated plants. It is belonged toegusi seed watermelon subspecies of ordinary watermelon species of Watermelon category; Edible seedwatermelon (Citrullus lanatus ssp. vulgaris var. megalaspermus) is commonly known as “seedwatermelon” and is the ordinary watermelon seed variants of watermelon from Cucurbitaceae. Ordinarywatermelons, edible seed watermelon and egusi seed watermelon from abroad and inbred lines were mainlyused in this study, using the means of quantitative genetics to analysis the genetic characters of the seedwatermelon germplasm and to cluster analysis; Adoption of internationally accepted physiological races ofpowdery mildew hosts to identify physiological races in seed watermelon of Changji, Xinjiang area;Identification for resistance to fusarium wilt, powdery mildew and bacterial fruit blotch (BFB) in seedlingstage through artificial inoculation on62inbred pure lines. The study results showed that:1The62germplasm resources are divided into two groups, through cluster analysis of genetic traitsand disease resistance, in which better resistance egusi watermelon belonged to the first group; The maingrow varieties of Linzi No.1, Minzi No.1,M in Qin big and black Feng belong to the second group. Egusiseed watermelon with ordinary seed watermelon heredity distance is farther, we should make full use ofhybridization to broaden its genetic basis.2Physiological race1of Powdery mildew (Sphacelotheca fuliginea) for edible seed watermelon inChangji area,Xinjiang were identified. There are13resistant germplasms;18middle resistant germplasmsis selected;31infected germplasms were selecteed from62germplasm resources.3Physiological race1of Fusarium wilt for edible seed watermelon were identified in Changji,Xinjiang.19seed watermelon germplasms performed middle resistance among total31materials;42lightresistance germplasms were selected accounting for67.7%of the total; There was a infected material ES50.4Edible seed watermelon germplasms were identified to bacterial fruit blotch (BFB), found that62materials were divided into three types: the number of (MR) germplasm is22; the (MS) germplasm is22;the (S) germplasm is18. Relatively highest resistance index is the ES84, which is inbred lines from egusiseed watermelon and edible seed watermelon hybrids.562inbred lines were ranked by the reverse ranking score. The best resistant is ES90, which frominbred lines of egusi seed watermelon and edible seed watermelon hybrids. There are8materials belong tothe first group and2belong to the second group in the resistance of the top ten, and all of the materialbelonged to the first group are egusi seed watermelon hybrids inbred lines.