We thank Drs. Harry Hodges and Mary Beth Kirkham for their comments and suggestions. Part of this work was supported by the US DOE, the USDA-UV-B Monitoring and Research Program, and the USDA-ARS 58-6402-7-241. Contributions were also made by the Department of Plant and Soil Sciences, Mississippi State University; Mississippi Agricultural and Forestry Experiment Station (BC-11471), MS, the Agronomy Department, Kansas State University, and the Kansas Agricultural Experiment Station Contribution No: KAES 09-129-B.

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