Selection Of Tomato Inbred Lines Resistant To Bacterial Wilt And Comparison Of Their Crosses

Tomato is one of the most widely cultivated crops in China, it is deeply loved by people because of its beautiful appearance and high nutritional value. But diseases hamper tomato production. There are more than 40 kinds of diseases affecting tomato production, such as TMV, fusarium wilt, and bacterial wilt. Especially, the bacterial wilt in the Yangtze River basin and Southern China, decreases production and lowers commodity characters. Chemical and physical controls to bacterial wilt have a side effect on environment, high-cost and poor-efficiency. The most effective method is to cultivate the good disease-resistance variety.In this study, the traditional artificial inoculation combination with molecular marker detection were used to select relevant materials, we aimed to get multi-resistant plants include selections of resistant to bacterial inbred lines, and lay the foundation for breeding resistance to bacterial wilt. Based on the multi-resistant inbred lines and good economic character lines, we got the fine hybrid combinations, the main results are as follows:1. Tomato F4 generations of the bacterial wilt-resistant commercial varieties such as Diamond, Guangdong star, oriental red,0495,0496, we made them selfing for three generations, inoculated their F4, F5 and F6 generations, then based on the individual plant selection method, we got the 12 inbred lines with good economic characters and resistance to three diseases,100 inbred lines resistance to two diseases, which was the foundation for breeding to resistance bacterial wilt in the future.2. We selected the good economic characters inbred lines as male parent, different characters of inbred lines as female parent from the F4 generation of inbred lines which resistance to bacterial wilt, and got 10 hybrid combinations, then we obtained 2 hybrid combinations with good characteres such as resistant to bacterial wilt, the yield, fruit flavor, early maturity and storability.3. We selected inbred line with resistance to bacterial wilt as one of the parent from the F5 generation of breeding lines, the other parent is the inbred line with good economic characters, made up 15 hybrids. Then we got 3 hybrid combinations with good economic characters and resistances to bacterial wilt, fusarium wilt, tobacco mosaic virus.