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对9个品种在3个不同海拔高度的烟叶进行游离氨基酸含量测定结果,烤烟品种间游离氨基酸含量差异较明显,且呈一定趋势变化。变化较大的是总游离氨基酸、脯氨酸、天冬氨酸、谷氨酸;较小的是蛋氨酸、亮氨酸、异亮氨酸、赖氨酸、组氨酸、精氨酸和NH3;甘氨酸、丝氨酸、丙氨酸、苏氨酸、缬氨酸、酪氨酸、苯丙氨酸居中。含量最多的是谷氨酸、天冬氨酸、脯氨酸,占总量的59 4%～65 92%;酪氨酸、苯丙氨酸、丙氨酸占13 61%～16 02%;缬氨酸、丝氨酸、苏氨酸占10 65%～13 91%,蛋氨酸占的2 19%～3 77%;赖氨酸、亮氨酸、甘氨酸占3 82%～5 08%,组氨酸、异亮氨酸、精氨酸仅占1 52%～2 45%.多数游离氨基酸的含量随海拔的升高而增加。
The results of free amino acid content of three cultivars at three different altitudes showed that the content of free amino acids in flue-cured tobacco varied significantly, and showed a certain trend. The major changes are the total free amino acids, proline, aspartic acid and glutamic acid; the lesser ones are methionine, leucine, isoleucine, lysine, histidine, arginine and NH3 ; Glycine, Serine, Alanine, Threonine, Valine, Tyrosine, Phenylalanine are centered. The most abundant are glutamic acid, aspartic acid and proline, accounting for 59 4% -65 92% of the total amount; tyrosine, phenylalanine and alanine accounting for 13 61% -16 02% Valine, serine, threonine 10 65% ~ 13 91%, methionine 19% ~ 3 77%; lysine, leucine, glycine 32 82% ~ 58 08%, histidine , Isoleucine and arginine accounted for only 1 52% -2 45% .The content of most free amino acids increased with the elevation of altitude.