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Forests 2013, 4(2), 488-499; doi:10.3390/f4020488

Stability of Slash Pine Families with Major Gene and Partial Resistance to Single-Gall and Mixed-Gall Inocula of Cronartium quercuum fusiforme in Greenhouse Studies

Plant Pathology Department, Cocoa Research Center, Executive Commission of the Plan for Cocoa Farming, Ex. PO 07, 45600-970, Itabuna, BA, Brazil
School of Forest Resources and Conservation, Institute of Food and Agricultural Sciences, University of Florida, P.O. Box 110410, Gainesville, FL 32611-0410, USA
Author to whom correspondence should be addressed.
Received: 27 April 2013 / Revised: 11 May 2013 / Accepted: 24 May 2013 / Published: 20 June 2013
(This article belongs to the Special Issue Fusiform Rust Disease—Biology and Management of Resistance)
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Single-gall and mixed-gall inocula from fusiform rust (Cronartium quercuum fusiforme) galls in field studies were used in greenhouse tests to investigate their pathogenic variability and the temporal and spatial stability of fusiform rust incidence of resistant slash pine (Pinus elliottii var. elliottii) seedlings. Analyses of variance showed significant main effects for families and inocula and for the interactions of families and inocula indicating abundant pathogenic variation and differential family resistance. Averaged over all families and inocula, there were no significant differences between sequential inocula, i.e., inocula from successive generations of the pathogen. However, when analyzed separately Family R1 with segregated major gene resistance showed increased rust incidence with successive generations of the pathogen. Also Family R1 accounted for a major portion of the temporal (51.4%) and spatial (49.6%) interaction sum of squares. In contrast the other resistant families each accounted for a minor portion of this statistic. These results indicate pathogen virulence toward major gene resistance, possible selection for virulence and the relative instability of Family R1 compared with other resistance families.
Keywords: Pinus elliottii var. elliottii; fusiform rust; pathogen virulence Pinus elliottii var. elliottii; fusiform rust; pathogen virulence
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Gramacho, K.P.; Schmidt, R.A.; Miller, T. Stability of Slash Pine Families with Major Gene and Partial Resistance to Single-Gall and Mixed-Gall Inocula of Cronartium quercuum fusiforme in Greenhouse Studies. Forests 2013, 4, 488-499.

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