Jiangsu Provincial University Natural Science Major Basic Research Project No.12KJA210001;Natural Science Foundation of Jiangsu Province No.BK20141248;Agricultural Science and Technology Project of Lianyungang Municipal Science and Technology Bureau No.CN1307江苏省省属高校自然科学重大基础研究项目No.12KJA210001;江苏省自然科学基金项目No.BK20141248;连云港市科技局农业攻关项目No.CN1307