国家自然科学基金41501344;农业部与财政部科研专项农办财函[2016]6号;湖南省重点学科建设项目No.2006180Supported by the National Natural Science Foundation of China41501344;the Special Fund for Ministry of Agriculture and FinanceNBCH [2016] 6;the Key Discipline Construction Projects in Hunan Province2006180