打顶后喷施不同浓度GA3和6-BA对烤烟农艺性状和化学成分的影响

以云烟87为试验材料,研究打顶后叶面喷施不同浓度的赤霉素（GA₃）和6-苄氨基嘌呤（6-BA）植物生长调节剂组合对烤烟生长和烟叶化学成分的影响。结果表明,在打顶当天喷施GA₃和6-BA可以增加烤烟叶面积,GA₃浓度为100mg/L、6-BA浓度为40mg/L时,烤烟叶面积增加最多;喷施GA₃和6-BA可以提高烟叶叶绿素含量,且随着二者浓度提高烟叶叶绿素含量呈增加趋势;外源GA₃和6-BA主要对碳氮化合物起调节作用,GA₃和6-BA联用可以提高烟叶中总糖、还原糖和钾含量,而单施6-BA则会引起烟碱含量升高,当GA₃浓度为50mg/L、6-BA浓度为40mg/L时,总糖和还原糖含量最高;不同浓度的GA₃和6-BA主要影响烟叶香味物质中的类胡萝卜素降解产物和新植二烯,当GA₃浓度为50mg/L、6-BA浓度为40mg/L时,烟叶中胡萝卜素降解产物和新植二烯等香味物质含量较高。

Effects of GA3 and 6-BA on Agronomic Traits and Chemical Components of Flue Cured Tobacco after Topping

Yunyan 87 was used as the experimental material to study the effects of different concentrations of gibberellin (GA₃) and 6-benzylaminopurine (6-BA) plant growth regulators on the growth and quality of flue-cured tobacco by foliar spraying after topping. The results showed that, spraying GA₃ and 6-BA on the day of topping could increase the leaf area of flue-cured tobacco and maximum increase was observed in case of 100mg/L GA₃ and 40mg/L 6-BA. Spraying GA₃ and 6-BA could increase the chlorophyll content in tobacco leaves, and chlorophyll content increased with the increase of GA₃ and 6-BA concentrations. GA₃ and 6-BA mainly regulated carbon and nitrogen compounds, the combination of GA₃ and 6-BA could increase contents of the total sugar, reducing sugar and potassium in tobacco leaves, while the use of 6-BA alone could increase nicotine content. When the concentration of GA₃ was 50mg/L and 6-BA was 40mg/L, the contents of total sugar and reducing sugar were the highest. Different concentrations of GA₃ and 6-BA mainly affected the degradation products of carotenoid and neophytadiene in tobacco flavor. When the concentration of GA₃ was 50mg/L and 6-BA was 40mg/L, the contents of carotenoid degradation products and neophytadiene in tobacco were higher.