白肋烟品种间游离氨基酸含量变化规律初探

Preliminary Study on the Free Amino Acids Content Changing Pattern Among Burley Tobacco Varieties

白肋烟品种间游离氨基酸含量差异较明显,且呈现一定规律。以组氨酸、脯氨酸、精氨酸、赖氨酸、异亮氨酸、亮氨酸品种间差异较大,酪氨酸、苏氨酸、NH3及总游离氨基酸差异较小,蛋氨酸、丙氨酸、甘氨酸、缬氨酸、苯丙氨酸、天冬氨酸居中;含量最多的是天冬氨酸、谷氨酸、脯氨酸占总量的44.38%～67.48%,丙氨酸、苏氨酸、酪氨酸占12.99%～22.91%,苯丙氨酸、缬氨酸、丝氨酸占7.61%～10.21%,甘氨酸、赖氨酸、组氨酸占2.73%～5.18%,亮氨酸、异亮氨酸、精氨酸占2.73%～5.18%,蛋氨酸占2.39%～3.28%;它们中大多数均随叶位升高而增加,综合各相关游离氨基酸的正负效应,品种间的香吃味品质可能是TN90,TN86,KY908比KY907,KY8959要好。游离氨基酸含量是否也在一定程度上受遗传基因调控值得进一步研究。

Free amino acid contents in burley cultivars are distinct,and show some trend. The variable of his,pro,arg,lys,ile,leu is comparatively large, and that of tyr,thr,NH_3 and total free amnino acid is comparatively small. The variable of met,ala,glu,val,phe,asp is mediately. The biggest of contents is asp,glu,pro,and accupies 44.38%-67.48% in total; ala,thr and tyr by 12.99%-22.91%;phe,val,ser by 7.61%-10.21%;gly,lys,his by 2.73%-5.18%;leu,ile,arg by 2.73%-5.18%;met by 2.39%-3.28%. With the stalk position rising,they will increase.By free amino acid positive-negative effects,the flavour of KY908,TN90,and TN86 is better than that of KY907,KY8959. The content of free amino acid is controlled by gene, which will be studies next.