Genetic parameters of resistance components to Xanthomonas spp. in tomato.

This study aimed to estimate genetic parameters of tomato for reaction to bacterial spot in six parents and fifteen hybrids to identify resistant genotypes and indicate breeding programs for satisfactory genetic gains. The genotypes were evaluated in a complete randomized block design with three replications and six plants per plot in a greenhouse. The resistance to bacterial spot was evaluated on three bases: on a grade scale (GS), based on the area under the disease- progress curve (AUDPC) and on the incubation period (IPR) of the races T1, T2 and T3, at 10 3 CFU mL -1 . UENF 157 was resistant to races T1, T2 and T3 and UENF 158 to race T2. The bulk method can be recommended for better results in recombined inbred lines for T1-resistance, while the pedigree method is proposed for T2 and T3.

[1]  C. Manceau,et al.  Pathogenicity assays restrict the species Xanthomonas campestris into three pathovars and reveal nine races within X. campestris pv. campestris , 2007 .

[2]  M. D. C. Fernandes,et al.  Efeito de produtos químicos e biológicos sobre a mancha bacteriana, flora microbiana no filoplano e produtividade de pimentão , 2006 .

[3]  C. Lopes,et al.  Herança da resistência à mancha-bacteriana em tomateiro , 2005 .

[4]  M. G. Pereira,et al.  Inheritance of bacterial spot disease in Capsicum annuum L. , 2004 .

[5]  N. Schaad,et al.  Reclassification of the xanthomonads associated with bacterial spot disease of tomato and pepper. , 2004, Systematic and applied microbiology.

[6]  L. E. A. Camargo,et al.  Raças de Xanthomonas spp. associadas à mancha-bacteriana em tomate para processamento industrial no Brasil , 2004 .

[7]  O. Kimura,et al.  Efeito de formulações cúpricas e cuprorgânicas na severidade da mancha-bacteriana e na população residente de Xanthomonas campestris pv. vesicatoria em pimentão , 2003 .

[8]  G. Van den Ackerveken,et al.  How the bacterial plant pathogen Xanthomonas campestris pv. vesicatoria conquers the host. , 2000, Molecular plant pathology.

[9]  L. O'garro,et al.  Xanthomonas campestris pv. vesicatoria from bell pepper and tomato in barbados undergoes changes in race structure, virulence and sensitivity to chemical control agents , 1999 .

[10]  J. B. Jones,et al.  Diversity among xanthomonads pathogenic on pepper and tomato. , 1998, Annual review of phytopathology.

[11]  Jeffrey B. Jones,et al.  Diversity of Xanthomonas campestris pv. vesicatoria in tomato and pepper fields of Mexico , 1996 .

[12]  Jeffrey B. Jones,et al.  A third tomato race of Xanthomonas campestris pv. vesicatoria , 1995 .