Transcriptomic and metabolomic analysis clarify the molecular mechanisms underlying the formation of sexual and apomictic Persian walnut (Juglans regia L.) embryos

TRA, JA, and JA-ILE play important roles with metabolites involved in apomixis. BAK1, trpB, AOC3, ASN, IAA, TDC, ZEP, JAZ, ALDH, and ACO may be the key genes involved in apomixis. These candidate genes could be strongly associated with the molecular mechanisms underlying apomixis in walnut were identified, and this will help clarify the formation of apomictic embryos in walnut.