| To reveal the genetic mechanism of fatty acid content in flax seed, 233 recombinant inbred lines(RILs) derived from DYM×STS (F6∶7) along with their P1 and P2 were planted in 3 environment conditions, i.e. Dingxi，Gansu Province; Guyuan, Ningxia Hui Autonomous Region, and Zhangjiakou, Hebei Province, respectively. Fatty acid contents were analyzed with a gas chromatograph. Mixed major gene plus polygene inheritance model was used to analyze the P1, P2, and RILs. The results showed that: (1) In the samples from Dingxi, Gansu Privence, palmitic acid, oleic acid, and linolenic acid contents were with a model of 1 major gene plus polygene and stearic acid and linoleic acid were with 4 major genes inheritance models; (2) In the samples from Guyuan, Ningxia Hui Autonomous Region, palmitic acid content was with polygene inheritance model, stearic acid and linolenic acid were with 4 major genes inheritance models, oleic acid content was with 3 major genes inheritance models, and linoleic acid content was with 3 major genes plus polygene inheritance models; (3) In the samples from Zhangjiakou, Hebei Province, palmitic acid，stearic acid, and linolenic acid contents were without major genes inheritance models, oleic acid content was with polygene inheritance models, and linoleic acid content was with 4 major genes inheritance models. Correlation analysis showed that linolenic acid content had highly negatively significant correlation with palmitic acid, stearic acid, oleic acid, and linolenic acid contents while stearic acid had highly significant correlation with oleic acid content. Therefore, high linolenic acid and other special fatty acids breeding should also consider the effect of the growing environment change on α-linolenic acid content beside of genetic factors. |