Authors: Smith, Denise R.; Stanosz, Glen R.

Source: Canadian Journal of Forest Research, Volume 42, Number 10, October 2012 , pp. 1819-1826(8)

Publisher: NRC Research Press

Abstract:

Four endophytes isolated from healthy shoots of adult red pine (<named-content content-type="species" xlink:type="simple">Pinus resinosa</named-content> Aiton) or jack pine (<named-content content-type="species" xlink:type="simple">Pinus banksiana</named-content> Lamb.) trees were tested as potential biocontrol agents of the conifer shoot blight and canker pathogens <named-content content-type="species" xlink:type="simple">Diplodia pinea</named-content> (Desmaz.) J. Kickx fil. and <named-content content-type="species" xlink:type="simple">Diplodia scrobiculata</named-content> J. de Wet, B. Slippers & M.J. Wingfield. The effect of the endophytes on the germination of <named-content content-type="genus" xlink:type="simple">Diplodia</named-content> species conidia and on the symptom severity caused by these pathogens on P. banksiana seedlings under greenhouse conditions was evaluated. Aggressiveness of each organism also was determined by means of single inoculations on jack pine seedlings. The results indicated that the endophyte <named-content content-type="species" xlink:type="simple">Trichoderma atroviride</named-content> P. Karst. showed a clear antagonism to Diplodia species. The culture filtrate of this fungus was able to reduce spore germination of D. scrobiculata. Furthermore, it was able to inhibit the D. pinea invasion when both organisms were inoculated in the same seedling. The observed reduction in the symptom severity on jack pine seedlings might be due to parasitism and (or) production of inhibitory compounds. Therefore, T. atroviride might deserve further investigations for its use as biocontrol agent against D. pinea.

Document Type: Research article

DOI: http://dx.doi.org/10.1139/x2012-132

Affiliations: 1: Department of Plant Pathology, University of Wisconsin-Madison, 1630 Linden Dr., Madison, WI 53706, USA.

Publication date: 2012-10-10

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