Effects of exogenous substance on the physical characteristics and internal quality of flue-cured tobacco upper leaf | 外源物质对烤烟上部叶物理性状及内在品质的影响

chinois. 探讨外源物质对烤烟上部烟叶物理特性和内在品质的影响，为烤烟生产中确定合理的调控措施提供科学依据。以烤烟品种NC89为试验材料，以喷施清水为对照，通过田间试验,研究烟株打顶后喷施不同外源物质（植物生长活性剂1~7号，即处理T1-T7）对烤烟上部烟叶物理特性、化学成分及香气物质含量的影响。打顶后喷施外源物质，烤烟上部叶的含梗率、单位面积质量及叶片厚度（T3除外）降低，单叶质量变化不大，但烟丝填充值均有所提高，而平衡含水率的变化比较复杂；烟碱及氯含量降低，钾含量有所提高，总糖、还原糖及总氮含量变化不同；新植二烯占香气物质总量的比例较大，不太利于类胡萝卜素类香气物质的形成(除T4外)，但较有利于非质体色素香气物质的产生(除T5外)；类西柏烷类香气物质含量升高，芳香族氨基酸代谢产物及美拉德反应产物变化趋势不同。综合比较认为，植物生长活性剂3号对烟叶品质的改善效果较为明显。

anglais. The study provided academic gist for tobacco production through exploring the effect of exogenous substance on the physical characteristics and internal quality of flue-cured tobacco upper leaf. A field experiment was employed to study the effect of exogenous substance (plant growth activity matter No. 1C7, water (CK)) on the physical characteristics and internal quality of flue-cured tobacco upper leaf of a tobacco cultivar NC89. Results indicated that: spraying exogenous substance on upper leaf after topping: (1) The stem percentage, leaf specific weight, thickness (except the 3rd treatment) declined, the single leaf weight changed little, the filling value increased, and the equilibrium moisture content experienced complicated changed. (2) The nicotine and Cl-1 content declined, and the K2O content increased, but the total sugar, the reducing sugar and the total nitrogen changed differently. (3) The neophytadiene content was characterized by higher ratio in the total aroma constituents, and it was not conducive for the producing of the carotenoid contents (except the 4th treatment), but conducive for the producing of the mon-olastie contents (except the 5th treatment), the content of cembratriendiol rose, but the tendency of the phenylalanine and the products of browning changed differently. The results showed that the 3rd exogenous substance could improve upper leaf quality significantly.