关键词: 胡麻, 品种（系）, 饱和脂肪酸, 不饱和脂肪酸, 品质特性

Abstract: Flaxseed is one of the main cash crops in Gansu Province, and Hexi area below 2 400 m above sea level is a high-yielding area in Gansu Province. In order to find out the influence of different altitudes on the quality characteristics of flax and the best planting area of different flax varieties in Zhangye, the content differences of the conventional quality indexes, saturated fatty acids and unsaturated fatty acids of 5 flax varieties in 4 different altitudes in Zhangye City were analyzed by using near infrared quality analyzer. The results showed that, the interaction effect between varieties and altitudes with the contents of protein, crude fat, dietary fiber, palmitic acid, heptadecanoic acid, myristic acid, tetracarboxylic acid, oleic acid and α-linolenic acid was extremely significant (P<0.01). The content of behenic acid, palmitoleic acid, cis-11-eicosapentaenoic acid, linoleic acid, γ-linolenic acid and cis-11,14,17-eicosatrienoic acid changed little with altitude and had good stability. On the basis of breeding goal of high oil content, taking into account other quality breeding goals such as high three unsaturated fatty acids (α-linolenic acid, oleic acid and linoleic acid), low two saturated fatty acids (palmitic acid and stearic acid) and high protein, the most suitable flax varieties to be planted in Ganzhou District of Zhangye City, Landao Town of Gaotai County and Sanbao Town of Minle County, and Liuba Town of Minle County were 5-9812-2-1, 09-3-11, Zhangya 2, respectively. Different altitudes had an important influence on the quality indexes of flax. As a production base of high-quality flax seeds, Zhangye City can make use of the different suitable planting areas of different flax varieties to vigorously develop quality breeding and comprehensive development of flax seeds.

Key words: flax, variety(lines), saturated fatty acid, unsaturated fatty acid, quality character