Presentaddress:DepartmentofGenetics,Development,andCellBiology,IowaStateUniversity,Ames,IA50011,USA. *Towhomcorrespondenceshouldbeaddressed:E-mail:xiangcb@ustc.eduorxiangcb@gmail Received19January2010;Revised11May2010;Accepted17May2010 Abstract Sulphurisanessentialelementforplantgrowthanddevelopmentaswellasfordefen...