Screening and genetic improvement of tomato for resistance to major diseases
1998
Opina, N.L.
Of the 4 commercial tomato varieties and 16 IPB advanced lines evaluated for resistance to late blight in the field, Walter and two IPB advanced lines namely UPL Tm 99-28 and UPL Tm 99-35 were rated resistance. Apollo, Tinagbak, Del Monte, UPL Tm 99-31, UPL Tm 99-32, UPL Tm 99-33, UPL Tm 99-34, UPL Tm 99-38, UPL Tm 99-40, UPL Tm 99-44 and UPL Tm 99-46 were rated moderately resistance. A total of 23 tomato commercial varieties and advanced lines were screened for resistance to 5 strains of Ralstonia solanacearum under greenhouse conditions. The farmer's variety Tinagbak in Liliw [Laguna, Philippines] was rated resistant to T151, the Bukidnon varieties 1403 and BRCI. IPB developed varieties Poor, Shalom 1, XTH6158, XTH6193 and TM95-12 were rated moderately resistant to T151 but moderately susceptible or susceptible to the other strains. Only IPB variety Marikit had resistance to 2 strains (T151 and T623) of R. solanacearum with 67 and 60% survival, respectively. The resistant checks 508 had resistance to T151, T623, and Tm22 strains but moderately susceptible to T625 and T668 strains. The other resistant check C108 had resistance to T623 and T625 but susceptible to T151 and Tm22 strains. R. solanacearum strain from Majayjay (T668) was the most virulent followed by Liliw (T625), Bukidnon (Tm22), Pangasinan (T623) and Laguna (T151). None of the tomato varieties/lines survived when inoculated with Majayjay strain of R. solanacearum.
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