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Loblolly pine seedling growth after inoculation with plant growth-promoting rhizobacteria and ozone exposure
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Titel: |
Loblolly pine seedling growth after inoculation with plant growth-promoting rhizobacteria and ozone exposure |
In: | Canadian Journal of Forest Research, 34, 2004, 7, S. 1410-1416 |
veröffentlicht: |
Canadian Science Publishing
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Umfang: | 1410-1416 |
ISSN: |
0045-5067 1208-6037 |
DOI: | 10.1139/x04-026 |
Zusammenfassung: | <jats:p> Plant growth-promoting rhizobacteria promote plant growth and induce biocontrol, but are affected by soil type, water stress, microbial competition, and environmental conditions. One unexplored factor is the interaction of rhizobacteria-inoculated plants exposed to ozone. Loblolly pine (Pinus taeda L.) seeds were inoculated with either Bacillus subtilis (Ehrenberg) Cohn or Paenibacillus macerans (Schardinger) Ash. In field trials, 4-week-old seedlings were exposed for 12 weeks to carbon-filtered (CF ≈ 12 ppb), 1× (≈46 ppb), or 2× (≈97 ppb) ozone for 12 h·d<jats:sup>1</jats:sup> in open-top chambers (OTC) in 1998 and 1999. In three greenhouse trials, 5-week-old seedlings were exposed to ozone at 0× (≈8 ppb), 1× (≈105 ppb), 2× (≈199 ppb), and 3× (≈298 ppb) for 4 h·d<jats:sup>1</jats:sup>, 5 d·week<jats:sup>1 </jats:sup>for 8 weeks in continuously stirred tank reactors (CSTR). In both the CSTRs and the OTCs, ozone-exposed seedlings exhibited 20%50% less biomass and more foliar injury as compared with nonexposed seedlings. In CSTRs, at the 3× exposure, B. subtilis-inoculated seedlings had 12% less foliar injury than noninoculated seedlings. Foliar injury was 65% less for B. subtilis-treated seedlings in 1998, and root surface area, total root length, and root diameter was 25%35% greater when seedlings were exposed to 2× ozone in the OTCs. This is the first report of rhizobacteria protecting seedlings against the negative effects of ozone exposure. </jats:p> |
Format: | E-Article |
Quelle: | Canadian Science Publishing (CrossRef) |
Sprache: | Englisch |