NDLI: Influence of a mycorrhizal fungus and/or rhizobium on growth and biomass partitioning of subterranean clover exposed to ozone

Content Provider	Springer Nature Link
Author	Miller, Joseph E. Shafer, Steven R. Schoeneberger, Michele M. Pursley, Walter A. Horton, Stephanie J. Davey, Charles B.
Copyright Year	1997
Abstract	The influence of soilborne symbionts such as rhizobia or mycorrhizal fungi on plant response to ozone (O$_{3}$) has not been well defined. Leguminous plants in the field are infected by both types of organisms, which influence plant nutrition and growth. We studied the effects of infection withRhizobium leguminosarum biovartrifolii and/orGigaspora margarita on response of subterranean clover (Trifolium subterraneum L. cv Mt. Barker) to O$_{3}$. Exposures were conducted in greenhouse CSTR chambers using four O$_{3}$ concentrations [charcoal-filtered (CF), 50, 100, or 150 ppb; 6 h day$^{−1}$, 5 day wk$^{−1}$ for 12 weeks] as main plots (replicated). Four inoculum types were subplot treatments, i.e., inoculated with one, both, or neither microorganisms. At 2-wk intervals, plants were exposed to$^{14}$CO$_{2}$ and harvested 24 h later for determination of biomass and$^{14}$C content of shoots and roots. Ozone at 100 or 150 ppb suppressed clover growth during the experiment. Inoculation withG. margarita alone suppressed clover growth by the last two harvests, whereasR. leguminosarum alone enhanced growth during this time period. When both symbionts were present, the plants grew similarly to the noninoculated controls. Shoot/root ratios were increased by 100 or 150 ppb O$_{3}$ compared to that for CF-treated plants. Shoot/root ratios were greater for all inoculated plants compared to noninoculated controls. Under low O$_{3}$ stress (CF or 50 ppb), plants inoculated with bothR. leguminosarum andG. margarita transported a greater proportion of recent photosynthate ($^{14}$C) to roots than did noninoculated plants; we attribute this to metabolic requirements of the microorganisms. At the highest level of O$_{3}$ stress (150 ppb), this did not occur, probably because little photosynthate was available and the shoots retained most of it for repair of injury. Statistically significant interactions occurred between O$_{3}$ and inoculum types for shoot and total biomass. When averaged across harvests, 50 ppb O$_{3}$ suppressed biomass in the plants inoculated withG. margarita alone. Apparently, the mycorrhizal fungus is such a significant C drain that even a small amount of O$_{3}$ stress suppresses plant growth under these conditions.
Starting Page	233
Ending Page	248
Page Count	16
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	96
Issue Number	1-4
e-ISSN	15732932
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1997-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	rhizobia VAM Hydrogeology Environment Atmospheric Protection/Air Quality Control/Air Pollution Terrestrial Pollution Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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INFLUENCE OF A MYCORRHIZAL FUNGUS AND/OR RHIZOBIUM ON GROWTH AND BIOMASS PARTITIONING OF SUBTERRANEAN CLOVER EXPOSED TO OZONE

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