Resistance to Tomato Yellow Leaf Curl Virus (TYLCV-IL [CU]) in F 2 tomato (S. lycopersicum, L.) populations segregating for Ty-1 y Ty-2 genes
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Abstract
byTomato Yellow Leaf Curl Virus (TYLCV-IL [CU]) has caused
extensive damage to tomato crops in Cuba. There are several
resistance genes that have been introgresed to tomato from
wildSolanum species. The objective of this study was to assess
the segregation of two such genes, Ty-1 and Ty-2, as the basis
for selection in improving resistance to TYLCV-IL [CU]. Two
F2 populations, susceptible cultivar �??Amalia�?? x resistant cultivar
�??H-24�?? (Ty-2), TY-2F2 and �??Amalia�?? x resistant cultivar �??LA3473�??
(Ty-1), TY-1F2 , were obtained. Plants F2 and plants of susceptible controls, cvs. �??Amalia�?? and �??STY-1�??. The plants, 25 days after sowing, were inoculated with viruliferous (Cuban isolate TYLCV-IL [CU]) whiteflies (Bemisia tabaci, biotype B) for 48 hours before transplantation to the field. The disease severity index (DSI, 0-4 scale) and viral DNA (dot blot hybridization) were evaluated 30 days after the inoculation. The plant frequency distribution of disease severity and viral DNA
concentration changed according to TY-2F2 and TY-1F2
plants. Therefore, we should select as resistant plants to TYLCV those with 1 score in TY-1F2 and 0 scored in TY-2F2 , when the
improvement program is performed by selecting phenotypic
resistance TYLCV-IL [CU] conferred by Ty-1 and Ty-2 resistance
genes, respectively.
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