砍收期與白肋煙游離氨基酸含量變化及品質(zhì)的關(guān)系
Effect of Stalk Cutting Time on Free Amino Acid Content in Burley Tobacco
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摘要: 用日立835-50 型氨基酸自動(dòng)分析儀，探索白肋煙砍收期游離氨基酸變化及對(duì)煙葉品質(zhì)的影響,。結(jié)果表明,，檢測(cè)的16 種氨基酸中，谷氨酸,、天冬氨酸,、脯氨酸含量較高，三者合計(jì)占總量的63.6%～74.33%,，其它13 種較低合計(jì)占25.67%～36.40%,。不同砍收期各部位葉總游離氨基酸含量差異較大，下部葉以3 周時(shí)最高,，5 周時(shí)最低,，中部葉、上部葉分別是4 周,、5 周最高,，均以6 周時(shí)最低，三部位平均以4 周最高,，5 周最低,。砍收期對(duì)各部位氨基酸含量的影響為下部葉>上部葉>中部葉,，對(duì)絲氨酸,、組氨酸、異亮氨酸的影響較大,，而對(duì)苯丙氨酸,、谷氨酸、總游離氨基酸的影響較小,。以打頂后下部3 周,、中部4 周（或全整株收晾）、上部5 周收晾,，更有利于各部位煙葉品質(zhì)的提高,。Abstract: A better understanding of the effects of stalk cutting time on free amino acid is necessary to further improve the leaf quality of burley tobacco. The objective of this study was to investigate whether there were differences in the free amino acid contests of three stalk leaves among the harvest time of 3, 4, 5 and 6 weeks after topping in burley tobacco. The results showed that out of 16 free amino acid types, three free amino acids, Glu, Asp, Pro, had a ratio of 63.60% to 74.33% to total amino acids. The total contents of other 13 types were lower, about 25.67% to 36.40%. Significant differences were observed in the content of free amino acids among different stalk leaves. The highest and lowest values were found in the harvest time of 3 and 5 weeks after topping in lugs, respectively. Although it had the lowest contents of free amino acids in the treatments of the harvest time of 6 weeks after topping in both cutters and leaves, the highest values were observed in the treatments of the harvest time of 4 and 5 weeks after topping, respectively. Average across three stalk leaves, it was greatest and lowest in the treatments of the harvest time of 4 and 5 weeks after topping, respectively. The impact of stalk cutting time on free amino acids was greatest in lugs, followed by leaves and cutters. Stalk-cut period also had a higher effect on the contents of ser, his, ile than those of phe, glu and FAA. It was concluded that the best harvest time to obtain good quality in burley tobacco was 3, 4 and 5 weeks after topping for lugs, cutters and leaves, respectively.
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