SciELO - Scientific Electronic Library Online

vol.30 issue4Marker assisted selection in the development of disease resistant plants, with emphasis on common bean and soybeanEvidence of induction of systemic resistance to eucalyptus rust by plant growth promoting rhizobacteria author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Fitopatologia Brasileira

Print version ISSN 0100-4158On-line version ISSN 1678-4677


LOBO, Valácia L. da S.; GIORDANO, Leonardo de B.  and  LOPES, Carlos A.. Inheritance of resistance to bacterial spot in tomato. Fitopatol. bras. [online]. 2005, vol.30, n.4, pp.343-349. ISSN 0100-4158.

The inheritance of resistance to bacterial spot (Xanthomonas campestris pv. vesicatoria, race T2) in tomato (Lycopersicon esculentum) was investigated in a field trial. The genotypes 'Ohio 8245' and 'Hawaii 7998' (resistant), 'CNPH 401-08' and 'CNPH 416.81.01.02' (susceptible) were crossed in a diallel scheme without reciprocals. Each cross was labeled as one family, represented by six different generations: Parent1, Parent2, F1, F2 and Backcrosses to parents (BC1 and BC2). The family 'Ohio 8245 ' Hawaii 7998' presented the lowest disease severity, followed by the family 'Hawaii 7998 ' CNPH 416.81.01.02' and by the family 'Ohio 8245 ' CNPH 416.81.01.02'. These last two families showed both higher broad and narrow sense inheritability estimates and the highest prediction of selection gain. The resistance was found to be quantitative, with four to eight genes involved, depending on the family. Transgressive segregation was observed in the 'Ohio 8245 ' CNPH 401-08', the 'Hawaii 7998 ' CNPH 401-08' and the 'Hawaii 7998 ' CNPH 416.81.01.02' families. The relevance of the additive effects was observed and for all the families the data fitted to additive-dominant model, with the additive component showing greater magnitude.

Keywords : horizontal resistance; inheritance; Lycopersicon esculentum; Xanthomonas campestris pv. vesicatoria.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License