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Shade Avoidance Influences Stress Tolerance in Maize

Published online by Cambridge University Press:  20 January 2017

Eric R. Page ,
Weidong Liu ,
Diego Cerrudo ,
Elizabeth A. Lee  and
Clarence J. Swanton
Eric R. Page
Affiliation:
Department of Plant Agriculture, Crop Science Building, University of Guelph, 50 Stone Road E., Guelph, ON N1G 2W1, Canada
Weidong Liu
Affiliation:
Department of Plant Agriculture, Crop Science Building, University of Guelph, 50 Stone Road E., Guelph, ON N1G 2W1, Canada
Diego Cerrudo
Affiliation:
Department of Plant Agriculture, Crop Science Building, University of Guelph, 50 Stone Road E., Guelph, ON N1G 2W1, Canada
Elizabeth A. Lee
Affiliation:
Department of Plant Agriculture, Crop Science Building, University of Guelph, 50 Stone Road E., Guelph, ON N1G 2W1, Canada
Clarence J. Swanton*
Affiliation:
Department of Plant Agriculture, Crop Science Building, University of Guelph, 50 Stone Road E., Guelph, ON N1G 2W1, Canada
*
Corresponding author's E-mail: [email protected]
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Abstract

Previous studies have suggested that the reduction in the root/shoot ratio that accompanies the shade avoidance response may reduce the tolerance of individuals to subsequent nutrient or moisture limitations. In this work, we examined the impact of the shade avoidance response on maize seedling growth and development and the response of these plants to a subsequent abiotic stress. Seedlings were grown in a field fertigation system under two light quality environments, ambient and a low red to far-red ratio, which were designed to simulate weed-free and weedy conditions, respectively. This system also enabled the controlled restriction of water and nutrients, which reduced the relative growth rate of the crop and created a secondary stress. Results of this study indicate that, while the shade avoidance response did reduce the root/shoot ratio in maize, this effect did not reduce plant tolerance to subsequent abiotic stress. Rather, the apparent additivity or synergism of shade avoidance and the secondary stressor on yield loss depended on whether the net effect of these two stressors was sufficiently large to shift the population toward the point where reproductive allometry was broken.

Keywords

Maize, Zea mays LZea mayscornlight qualityred to far-red ratioroot to shoot ratiostressharvest indexreproductive allometry
Type
Weed Biology and Ecology
Information
Weed Science , Volume 59 , Issue 3 , September 2011 , pp. 326 - 334
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: Agriculture and Agri-food Canada, Greenhouse and Crops Processing Centre, 2585 County Rd. 20, Harrow, ON N0R 1G0, Canada.

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