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

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

1
, 2,*  and 2
Received: 27 April 2013; in revised form: 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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Abstract: 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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

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.

AMA Style

Gramacho KP, Schmidt RA, 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(2):488-499.

Chicago/Turabian Style

Gramacho, Karina P.; Schmidt, Robert A.; Miller, Thomas. 2013. "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 4, no. 2: 488-499.


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