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Elevated CO2 causes large changes to morphology of perennial ryegrass (Lolium perenne)


Brinkhoff, R and Porter, M and Hovenden, MJ, Elevated CO2 causes large changes to morphology of perennial ryegrass (Lolium perenne), Crop and Pasture Science, 70, (6) pp. 555-565. ISSN 1836-0947 (2019) [Refereed Article]

Copyright Statement

Journal compilation Copyright 2019 CSIRO

DOI: doi:10.1071/CP18569


Plant morphology and architecture are essential characteristics for all plants, but perhaps most importantly for agricultural species because economic traits are linked to simple features such as blade length and plant height. Key morphological traits likely respond to CO2 concentration ([CO2]), and the degree of this response could be influenced by water availability; however, this has received comparatively little research attention. This study aimed to determine the impacts of [CO2] on gross morphology of perennial ryegrass (Lolium perenne L.), the most widespread temperate pasture species, and whether these impacts are influenced by water availability. Perennial ryegrass cv. Base AR37 was grown in a well-fertilised FACE (free-air carbon dioxide enrichment) experiment in southern Tasmania. Plants were exposed to three CO2 concentrations (~400 (ambient), 475 and 550 µmol mol–1) at three watering-treatment levels (adequate, limited and excess). Shoot dry weight, height, total leaf area, leaf-blade separation, leaf size, relative water content and specific leaf area were determined, as well as shoot density per unit area as a measure of tillering. Plant morphology responded dramatically to elevated [CO2], plants being smaller with shorter leaf-blade separation lengths and smaller leaves than in ambient (control) plots. Elevated [CO2] increased tillering but did not substantially affect relative water content or specific leaf area. Water supply did not affect any measured trait or the response to elevated [CO2]. Observed impacts of elevated [CO2] on the morphology of a globally important forage crop could have profound implications for pasture productivity. The reductions in plant and leaf size were consistent across a range of soil-water availability, indicating that they are likely to be uniform. Elucidating the mechanisms driving these responses will be essential to improving predictability of these changes and may assist in breeding varieties suited to future conditions.

Item Details

Item Type:Refereed Article
Keywords:ryegrass, elevated carbon dioxide, global change, morphology, productivity, climate change, leaf length, relative water content, specific leaf area, temperate pasture
Research Division:Biological Sciences
Research Group:Other biological sciences
Research Field:Global change biology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the environmental sciences
UTAS Author:Brinkhoff, R (Miss Rose Brinkhoff)
UTAS Author:Porter, M (Ms Meagan Porter)
UTAS Author:Hovenden, MJ (Professor Mark Hovenden)
ID Code:136870
Year Published:2019
Funding Support:Australian Research Council (DP150102426)
Web of Science® Times Cited:4
Deposited By:Plant Science
Deposited On:2020-01-21
Last Modified:2020-05-20

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