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Offspring of plants exposed to elevated or ambient CO2 differ in their impacts on soil nitrification in a common garden experiment

journal contribution
posted on 2023-05-17, 19:02 authored by Bowatte, S, Newton, PCD, Hill, A-M, Theobald, P, Luo, D, Mark HovendenMark Hovenden, Osanai, Y
Long-term exposure to elevated carbon dioxide (CO2) may select for different plant phenotypes with consequences for microbial associations and functions. We collected seeds from two grasses that had grown in a Free Air Carbon Dioxide Enrichment (FACE) experiment for 5 and 11 years, and grew them in a common garden to assess how elevated CO2 affected the rate of nitrification in rhizosphere soil. The comparison was made in a 'common-garden' so that differences could be ascribed to inherent changes in the plant populations. We found that seed of both species from the ambient populations produced plants that had similar rates of nitrification; however, seed from the elevated CO2 population produced ryegrass plants with a significantly greater nitrification rate and browntop plants with a significantly lower rate than the ambient population. These differences were not related to changes in root mass so represent a fundamental shift in plant/microbe interactions under elevated CO2.

Funding

Australian Research Council

History

Publication title

Soil Biology and Biochemistry

Volume

62

Pagination

134-136

ISSN

0038-0717

Department/School

School of Natural Sciences

Publisher

Pergamon-Elsevier Science Ltd

Place of publication

Oxford, UK

Rights statement

Copyright 2013 Elsevier

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the environmental sciences

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