Fitopatologia Brasileira (2005) 30, 343-349

Valácia L. da S. Lobo, Leonardo de B. Giordano and Carlos A. Lopes (2005)
Herança da resistência à mancha-bacteriana em tomateiro
[Inheritance of resistance to bacterial spot in tomato]
Fitopatologia Brasileira 30 (4), 343-349
Abstract: 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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Database assignments for author(s): Carlos A. Lopes

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Xanthomonas campestris pv. vesicatoria	Tomato (Solanum lycopersicum)	Brazil (south)