1. Key Laboratory of Environment Remediation and Ecological Health, College of Environmental and Resource Science, Zhejiang University, Ministry of Education, Hangzhou 310058, China (S.T., R.X., H.W., Y.H., J.G, X.C.L., X.G., L.L.);
2. Zhejiang Provincial Key Laboratory of Subtropic Soil and Plant Nutrition, Zhejiang University, Hangzhou 310058, China (H.W., Y.H., X.G., X.Y.L., L.L.); and
3. Department of Plant Sciences, University of California, Davis, California 95616 (P.B.)