Evaluation of tomato germplasm for resistance to geminiviruses in Sanarate, GT

         Luis Mejia, Universidad de San Carlos, Project leader

Breeding line:  TY198 and TY197, with introgressions from L. peruvianum from Moshe Lapidot and colleagues, Volcani Center (Plant Dis. 81:1425-1428; J. Amer. Soc. Hort. Sci. 123:1004-1006) showed good resistance to the geminiviruses in Sanarate.  TY197 was susceptible to a soil-borne pathogen and TY198 showed more resistance to this pathogen.

  TY198 is to the left of the wooden stake, and a susceptible line is right of the stake. Leaves tend to be more "wild-type" than L. esculentum.  Fruits are small, less than 60 g, but very prolific producer.  Resistance controlled by more than one (may be three) recessive genes.  TY198 generally had a DSI of less than 2 and many times a DSI of 1-1.5.

[Back to Field Tests, March 03] [Breeding tomatoes for resistance to geminiviruses in Guatemala]