基金the Knowledge Innovation Project of the Chinese Academy of Sci-ences (Grant No. KZCX2-YW-318)the National Natural Science Foundation of China (Grant No. 40572102)+1 种基金the Ministry of Science and Technology of China (Grant No. 2006BAB19B03)the Sino-Australia Special Collaboration Funds (Grant Nos. 4061120030 and CH050099)