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Light Response of Native and Introduced Miscanthus sinensis Seedlings

Published online by Cambridge University Press:  20 January 2017

David P. Matlaga ,
Lauren D. Quinn ,
Adam S. Davis  and
J. Ryan Stewart
David P. Matlaga*
Affiliation:
Global Change and Photosynthesis Research Unit, USDA Agricultural Research Service, N-319 Turner Hall, 1102 S Goodwin Avenue, Urbana IL, 61801
Lauren D. Quinn
Affiliation:
Energy Biosciences Institute, University of Illinois, 1206 W Gregory Drive, Urbana, IL 61801
Adam S. Davis
Affiliation:
Global Change and Photosynthesis Research Unit, USDA Agricultural Research Service, N-319 Turner Hall, 1102 S Goodwin Avenue, Urbana IL, 61801
J. Ryan Stewart
Affiliation:
Department of Crop Sciences, University of Illinois, 1201 S Dorner Drive, Urbana, IL 61801
*
Corresponding author's E-mail: dmatlaga@illinois.edu
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Extract

The Asian grass Miscanthus sinensis (Poaceae) is being considered for use as a bioenergy crop in the U.S. Corn Belt. Originally introduced to the United States for ornamental plantings, it escaped, forming invasive populations. The concern is that naturalized M. sinensis populations have evolved shade tolerance. We tested the hypothesis that seedlings from within the invasive U.S. range of M. sinensis would display traits associated with shade tolerance, namely increased area for light capture and phenotypic plasticity, compared with seedlings from the native Japanese populations. In a common garden experiment, seedlings of 80 half-sib maternal lines were grown from the native range (Japan) and 60 half-sib maternal lines from the invasive range (U.S.) under four light levels. Seedling leaf area, leaf size, growth, and biomass allocation were measured on the resulting seedlings after 12 wk. Seedlings from both regions responded strongly to the light gradient. High light conditions resulted in seedlings with greater leaf area, larger leaves, and a shift to greater belowground biomass investment, compared with shaded seedlings. Japanese seedlings produced more biomass and total leaf area than U.S. seedlings across all light levels. Generally, U.S. and Japanese seedlings allocated a similar amount of biomass to foliage and equal leaf area per leaf mass. Subtle differences in light response by region were observed for total leaf area, mass, growth, and leaf size. U.S. seedlings had slightly higher plasticity for total mass and leaf area but lower plasticity for measures of biomass allocation and leaf traits compared with Japanese seedlings. Our results do not provide general support for the hypothesis of increased M. sinensis shade tolerance within its introduced U.S. range compared with native Japanese populations.

Keywords

EulaliagrassMiscanthus sinensis AnderssBiomass allocationlight responseMiscanthus sinensisphenotypic plasticity
Type
Research
Information
Invasive Plant Science and Management , Volume 5 , Issue 3 , September 2012 , pp. 363 - 374
Copyright
Copyright © Weed Science Society of America 

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