Abstract:

The flavor and main nutritional quality of 3 wild populationsofAllium tuberosum Rottler production in southeastern Tibet were evaluated. The populations included Muxu and Quzika populations of Markham County，as well as Raojin population of Zogong County. The results showed that there were 21 kinds of amino acids in the 3 populations，and the content of glutamine（Gln）was the highest，followed by alanine（Ala），which accounted for 12.87%–22.03% and 10.33%–12.55% of total amino acids，respectively. The 8 essential amino acids for human body were at a low level，0.9431 mg · g^-1 in Muxu population（accounting for 35.80%）0.7884 mg · g^-1 in Quzika population（accounting for 36.61%）and 1.1895 mg · g^-1 in Raojin population（accounting for 41.16%）. Fourteen kinds of amino acids showed significant difference in different degree. Lower vitamin B₁（around 0.3 μg · g^-1）and vitamin B₂（around 0.4 μg · g^-1），higher vitamin A（around 10 μg · g^-1）and vitamin E（from 3 to 13 μg · g^-1）while rich vitamin C（around 1.5 mg · g^-1）were detected in all the three populations. In contrast，the content of vitamin B₆ was less than 0.1 μg · g^-1 thus below the limit of detection. Ten kinds of aromatic substances were detected in Muxu and Quzika populations while 11 kinds of aromatic substances in Raojin population. Methyl mercaptan was only detected in Raojin population. It displayed difference in varying degree among the ten aromatic substances contained in the 3 populations. Dimethyl disulfide had the highest content among all the aromatic substances in the 3 populations，accounting for 70% of the aromatic substances. The content of soluble sugar，protein and water showed significant differences in varying degree among populations.

Key words: Allium tuberosum, population, flavor substance, nutritional quality, evaluation