The financial support for the present study from National Natural Science Foundation of China(30260058);Scientific and Technological Development Foundation of Guangxi Academy of Agricultural Sciences is thankfully acknowledged..
supported by China National Natural Science Foundation(30360053);Science and Technology Department of Guangxi(Project No.Gui Ice Neng 05112001-1A1);Guangxi Key Labo ratory of Subtropical Bioresource Conservation and Utilization.