国家自然科学基金No.31260024;江西省自然科学基金No.20122BAB214012;江西农业大学大学生创新训练计划No.DC201337 Supported by the National Natural Science Foundation of China No.31260024,the Jiangxi Provincial Natural Science Foundation No.20122BAB214012 and the Students Innovation Training Program of Jiangxi Agricultural UniversityNo.DC201337