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Published online 7 May 2007
Published in J Environ Qual 36:904-912 (2007)
DOI: 10.2134/jeq2006.0425sc
© 2007 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Changes in Crested Wheatgrass Root Exudation Caused by Flood, Drought, and Nutrient Stress

Amelia Henrya, William Doucetteb, Jeanette Nortona and Bruce Bugbeea,*

a Dep. of Plants, Soils, and Biometeorology, Utah State Univ., Logan UT 84321
b Dep. of Civil and Environmental Engineering, Utah State Univ., Logan UT 84321


Figure 1
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  		Fig. 1. Glass column system used for axenic plant culture and study of root exudates.

 

Figure 2
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  		Fig. 2. Exudation rate per plant per day over the duration of the study.

 

Figure 3
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  		Fig. 3. Total organic carbon (TOC) in exudates per kg new dry plant. Kilograms new dry mass was estimated from transpiration rates and the calculated relative growth rates.

 

Figure 4
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  		Fig. 4. Exudation rates of five organic acids detected in leachate samples. All values are corrected for recovery efficiencies. Note the different scales of the y-axes. Line types for treatments are the same as other graphs.

 

Figure 5
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  		Fig. 5. Organic acids as a percentage of total organic carbon (TOC), shown by acid (left side) and by treatment (right side).

 

Figure 6
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  		Fig. 6. Comparison of organic acid concentrations in roots with cumulative amounts of organic acid detected from the leachates.

 




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The SCI Journals Agronomy Journal Crop Science
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Copyright © 2007 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.