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26465 
Journal Article 
Interaction of ozone exposure and Fusarium subglutinans inocculation on growth and disease development of loblolly pine seedlings 
Carey, WA; Kelley, WD 
1994 
Yes 
Environmental Pollution
ISSN: 0269-7491
EISSN: 1873-6424 
84 
1 
35-43 
English 
15091722 
WOS:A1994MT57600006 
Seedlings from ten half-sib families of loblolly pine (Pinus taeda) were exposed in open-top chambers to carbon-filtered air (CF), non-filtered air (NF), or air amended with ozone to 1À7 or 2À5 times ambient. After 105 days of exposure, half the seedlings within each family were wounded but not inoculated and half were wounded and inoculated with the pitch canker fungus, Fusarium subglutinans, to which five families were relatively resistant. After an additional 50 days of ozone treatment, seedling growth and canker development were recorded. Cankers were significantly (o- < 0À05) smaller among resistant compared to susceptible families, and were significantly larger among seedlings receiving the highest (25) compared to the ambient (NF) ozone treatment. The wound scars of non-inoculated seedlings were also significantly larger among seedlings receiving the 25 compared to the NF treatment, but these dimensions did not differ significantly with seedling family or resistance. The weights of needles and large roots were significantly smaller at the 25 compared to the 17 ozone treatment for inoculated but not for non-inoculated seedlings; this resulted in a significant interaction for ozone and inoculation effects. Among resistant families, root weights were significantly smaller for inoculated seedlings. Diameter growth and dry weights of needles were significantly smaller among inoculated compared to non-inoculated seedlings, but did not differ between NF and 25 ozone treatments.