Agronomic traits and resistance of pepper lines selected by molecular assistance to Phytophthora Blight from different resistance sources

Resumo

Belonging to the Oomycete genus, Phytophthora capsici has wide range host profile and is responsible of many devastating diseases in many countries. In addition to time consuming problem for transferring resistance to susceptible varieties, backcrossing method causes losing of genes providing resistance to susceptible varieties. In this study transferring P. capsici resistance genes to susceptible red pepper lines with molecular marker assistance was aimed during 12 years breeding period. Two different breeding populations from CM334 and PM217 were compared by stem inoculation test at receptivity, inducibility and stability stage. CM334 was found more effective for transferring all resistance components while PM217 was found suitable for keeping agronomic traits along with two important resistance component inducibility and stability. These two resistant components were found highly correlated length of stem necrosis. C-29 and C-18 have improved from CM334 as resistant as CM334; P-73 and P-77 have been improved satisfactorily resistant and yielded lines from PM217. Molecular marker assistance proved that resistance of lines differentiate phenotypically despite the genotypes have same genes.