Introgression of TY-2 gene for resistance to tomato leaf curl virus(ToLCV) into tomato variety anagha through marker assisted backcross

Abstract

The present research work entitled ‘Introgression of Ty-2 gene for resistance to Tomato leaf curl virus (ToLCV) into tomato variety Anagha through marker assisted backcross’ was conducted in the Department of Plant Breeding and Genetics, College of Agriculture, Vellayani during the year 2019-2023, with an objective to develop high yielding and ToLCV resistant backcross progenies by introgression of Ty2 gene into tomato variety Anagha through marker assisted backcross and also to understand the nature and magnitude of gene effects of different yield related characters. The 17 BC2F1 lines containing Ty2 gene developed in the study can be carried forward for the development of a ToLCV resistant essentially derived variety (EDV). Pyramiding of resistance genes Ty-1, Ty-3, Ty-4, ty-5 or Ty-6 along with Ty2 may enhance the spectrum and durability of resistance. In generation mean analysis, additive and additive x additive gene effects are significant for attributes investigated. Non-additive gene effects were observed to be overpower additive gene effects. Hence, breeding procedure which could exploit non-additive gene action would be suitable for improvement. These methods are used for improvement followed by conventional selection.