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    Herbivore-induced changes in plant carbon allocation: Assessment of below-ground C fluxes using carbon-14

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    Author
    Crossley, D.A. Jr; Cheng, Weixin; Holland, J. Nathaniel
    Date
    1996-03
    Abstract
    Effects of above-ground herbivory on shortterm plant carbon allocation were studied using maize (Zea mays) and a generalist lubber grasshopper (Romalea guttata). We hypothesized that above-ground herbivory stimulates current net carbon assimilate allocation to below-ground components, such as roots, root exudation and root and soil respiration. Maize plants 24 days old were grazed (c. 25-50% leaf area removed) by caging grasshoppers around individual plants and 18 h later pulse-labelled with 14CO2. During the next 8 h, ~4C assimilates were traced to shoots, roots, root plus soil respiration, root exudates, rhizosphere soil, and bulk soil using carbon-14 techniques. Significant positive relationships were observed between herbivory and carbon allocated to roots, root exudates, and root and soil respiration, and a significant negative relationship between herbivory and carbon allocated to shoots. No relationship was observed between herbivory and 14C recovered from soil. While herbivory increased root and soil respiration, the peak time for ~4CO2 evolved as respiration was not altered, thereby suggesting that herbivory only increases the magnitude of respiration, not patterns of translocation through time. Although there was a trend for lower photosynthetic rates of grazed plants than photosynthetic rates of ungrazed plants, no significant differences were observed among grazed and ungrazed plants. We conclude that above-ground herbivory can increase plant carbon fluxes below ground (roots, root exudates, and rhizosphere respiration), thus increasing resources (e.g., root exudates) available to soil organisms, especially microbial populations.
    Description
    journal articel
    Citation
    Crossley, D.A. Jr, Cheng, Weixin and Holland, J. Nathaniel. "Herbivore-induced changes in plant carbon allocation: Assessment of below-ground C fluxes using carbon-14." (1996) Springer-Verlag: https://hdl.handle.net/1911/21698.
    Keyword
    root exudates; rhizosphere respiration; photosynthetic rate; carbon allocation; herbivory
    Type
    Journal article
    Publisher
    Springer-Verlag
    Citable link to this page
    https://hdl.handle.net/1911/21698
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    • EEB Faculty Publications [67]

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    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map