Department of Computer Science and Engineering, Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521 USA and School of Information Science and Technology, Tsinghua University, Beijing 100084, China.|Department of Computer Science and Engineering, Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521 USA and School of Information Science and Technology, Tsinghua University, Beijing 100084, China.|Department of Computer Science and Engineering, Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521 USA and School of Information Science and Technology, Tsinghua University, Beijing 100084, China.