烤烟打顶后喷施外源激素对中部烟叶品质的互作效应

为探究外源激素对烤烟中部烟叶品质的影响,在打顶后的烟株表面喷施生长素(IAA)与赤霉素(GA_3)2种生物制剂,分析不同浓度的赤霉素和生长素及其互作对烤烟理化性质、游离态和糖苷结合态香味物质的影响。结果表明,在同一生长素水平下增施赤霉素及在同一赤霉素水平下增施生长素均可改善烤后烟叶理化性质,增加游离态和糖苷结合态香味物质总量,且浓度越高效果越优。生长素和赤霉素互作对烟叶质重、抗张力、烟碱、总糖、糖碱比有极显著效应;相对较高水平的生长素和赤霉素互作配施可显著提高烟叶香味品质效果,其中20 mg·L~(- 1)IAA+20 mg·L~(- 1)GA_3处理在烟株生长及品质提升方面效果最佳。本研究结果为优质烤烟生长及其调控工作提供了理论参考。

Interactive Effects of Exogenous Hormone on Quality of Middle Leaves Among Flue-cured Tobacco After the Time of Topping

In order to explore the effect of exogenous preparation on the quality of middle leaves among flue-cured tobacco,a field experiment was carried out to analysis the effects of different level IAA and GA3and their interaction spraying on physical characteristics,chemical components,free and glycosidic aroma components in middle leaves among flue-cured tobacco.Results showed that amendment of IAA to fields the same in GA3 level or application of GA3 to fields the same in IAA level improved the physical characteristics,coordinate the chemical components,increased the content of free and glycosidic aroma components of the flue-cured leaves,and the effect of higher concentration is better.The interaction between IAA and GA3 had some significantly positive effects on quality weight,filling value,reducing sugar,total nitrogen and nitrogen-nicotine ratio.The application of a high rate of IAA and GA3 was more conducive to improve the content of free and glycosidic aroma components than application of a low rate of IAA plus a low rate of GA3.And the affection which promoted the growth of tobacco plant and improved the quality of leaves is best of the treatment 20 mg· L-1 IAA + 20 mg· L-1 GA3.The results provided theoretical basis for the growth and regulation of high quality flue-cured tobacco.