Abstract
Tomato TYLCV is difficult to prevent by chemicals or other methods Thus, developmentof resistant cultivar is certainly needed. Especially, a resistant cultivar is required that show increased resistance through the accumulation of individual TYLCV resistance gene, Ty-1,2 and 3 (partial dominance). The phenotype of resistance was surveyed by the infection of whiteflies against 7 lines such as TYLCV resistant line (11-TY1-AV), susceptibility-control cultivar (11-TY5-AV), 3 lines of F3-generation and 4 lines of F2-generation. These cultivar and lines were artificially inoculated by TYLCTHV strain. The susceptible symptom could be confirmed at one week after the inoculation. After 10 days of inoculation, 83% of susceptible control showed the infected symptom. After 13 days, 100% of the control showed the TYLCV symptom. However, 16 individuals was infected out of 44 individuals in 11-TY4-AV and 12 individuals was infected out of 38 individuals in 11-TY6-AV. Eight individuals was infected out of 43 individuals in 1-TY7-AV, and 11 individuals was infected out of 42 individuals in 11-TY8-AV. Regarding these results, the genetic segregation ratio (3 : 1) in phenotype of 4 lines of F2 generation is following the Mendelism in all lines. Also, it could be confirmed that the resistance level is depending on maternal lines even with same paternal line that is resistant to TYLCV.
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