National Basic Research Program of China(2009CB930801);National Natural Science Foundation of China(10904155,21003145);Zhejiang Provincial Natural Science Foundation of China(D4080489,Y4090044);Ningbo Natural Science Foundation(2010A610170)and Ningbo Natural Science Foundation(2010A610190);the CAS/SAFEA International Partnership Program for Creative Research Teams;Program for Science and Technology Innovative Research Team of Zhejiang Province and Ningbo Municipality(2009B21005)