Identification Of Resistance To Bacterial Wilt And Verticillium Wilt Of Eggplant Rootstock Germplasms And Studying The Quantitative Genetic

In this article, we did test about the evaluation of resistance to bacterial wilt and Verticillium wilt with14eggplant rootstock germplasm resources (10of them are wild species and4of them are affinis cultispecies), cleared the levels of resistance to a variety of quality resources, it is indicated that tested rootstock germplasm resources have important use in inheritance of resistance to bacterial wilt and Verticillium. We builded F1, F2, B1C1P1and B1C1P2genetic generations of germplasm with different resistant levels to research quantitative genetic of bacterial wilt and Verticillium wilt resistance, analysized correlation and heterosis of inheritance of resistance to bacterial wilt and Verticillium by comparing the disease index of these two diseases in Fl of the germplasm. The results provide the basis for using rationally of rootstock germplasm with different resistant phenotype as breeding materials to breed rootstocks with a high level of resistance to bacterial wilt and Verticillium. The main findings are as follows:1. The test identified5rootstock germplasm resources immune to bacterial wilt, the numbers are B, D, J7, X7, W7. C, J4, J5display a high level of resistance, A1and J62display a level of resistance, J61displays a mid level of resistance, A2displays a level of susceptibility, E and F display a high level of susceptibility.2. The test selected3rootstock germplasm resources immune to Verticillium wilt, the numbers are J7, X7, W7. A2, E, F, J4, J5express a high level of resistance, J62expresses a level of resistance, A1and D express a mid level of resistance, B and J61express a level of susceptibility, C expresses a high level of susceptibility. 3. A1, D, J4, J5,J62,J7, X7and W7are simultaneously resistant to bacterial wilt and Verticillium, and J7, X7, W7are immune to both diseases, B, C, J61are only resistant to bacterial wilt, and A2, E, F are only resistant to Verticillium, there aren’t any rootstock materials susceptible both to bacterial wilt and Verticillium.4. Study about the quantitative genetic of resistance to bacterial wilt of each generation of Al, Rf indicates that resistant genetic of eggplant bacterial wilt is incomplete dominant inheritance, and controlled by more than2DNAs, it is effected by additive effects and non-additive effects as well as reciprocal cross effect, and the additive effects play a major role. Inheritance of resistance to eggplant bacterial wilt fits the genetic model of "additive-dominance".5. Study about the quantitative genetic of resistance to Verticillium wilt of each generation of A2, Rf indicates that resistance to Verticillium is controlled by1to2genes, fits the genetic model of "additive-significantly-Epistatic".6. Analysis genetic significance and using value of the different families on bacterial wilt and Verticillium Wilt resistance, the results show that:Bacterial wilt resistance inheritance of A1and A2is effected both by additive and non-additive effects, and that of J61, J62is only effected by the non-additive effects. Verticillium wilt resistance inheritance of J62is effected both by additive and non-additive effects, and that of Al is effected by none of them, that of A2is only effected by non-additive effects, and that of J61is only effected by additive effects. It is indicated that resistance phenotype of the two diseases of resources are largerly affected by the environment, and it has a low genetic stability.7. The result of analysizing resistant phenotype of4germplasms with different resistant level and Rf in their F1shows that there are2combinations showing resistance to bacterial wilt,6combination showing mid resistance, and there are3combinations showing resistance to Verticillium, one combinations showing mid resistance. The remaining eight combinations are susceptible both to bacterial wilt and Verticillium. It shows that genes controlling of bacterial wilt resistance may have a certain interaction with those of Verticillium Wilt resistance, the expression of the former may suppress that of the latter. 8. Results of resistance heterosis research show that:Part of the combinations of A1and A2as female parent in F1show negative super parent advantage to bacterial wilt; but no heterosis of resistance to verticillium wilt is found. There are two combinations of J61, J62and Rf as female parent families having heterosis of bacterial wilt, they are J61×A2, Rf×A2, and5combinations of them having heterosis of Verticillium wilt, they are Rf×Al, J61×Rf, J62xRf, RfxJ61and RfxJ62.