烤烟变黄期叶绿素降解动力学分析
摘要：为研究不同烤烟品种的变黄特性和预测变黄期烟叶叶绿素含量变化，通过分析不同品种（红花大金元、K326和云烟85）在不同变黄温度（34 ℃、36 ℃、38 ℃、40 ℃和42 ℃）下烟叶叶绿素含量变化，建立了烟叶叶绿素降解动力学模型。试验结果表明：（1）随着变黄温度的升高烟叶叶绿素降解加快，变黄温度较低时（34 ℃、36 ℃）烟叶叶绿素降解存在延滞期，高温变黄（40 ℃、42 ℃）不存在延滞期；相同变黄温度下，云烟85烟叶叶绿素降解最快，K326次之，红花大金元最慢。（2）利用一阶反应模型可以很好地描述变黄期烟叶叶绿素含量变化，随着变黄温度升高烟叶叶绿素降解半衰期t1/2缩短，红花大金元、K326和云烟85烟叶叶绿素降解活化能分别为61.76、56.20和53.16 kJ/mol；（3）试验建立了基于温度波动变化的叶绿素降解反应模型，为预测实际变黄过程中烟叶叶绿素含量变化提供理论参考。
关键词：烤烟；变黄期；叶绿素；降解动力学；模型
中图分类号：TS44+1文章编号：1007-5119（2017）04-0086-06DOI：10.13496/j.issn.1007-5119.2017.04.014
Abstract： In order to study the yellowing characteristics ofdifferent tobacco varieties and predict the changes of chlorophyll content during the yellowing stage. Changes of flue-cured tobacco leaves’ chlorophyll content in different varieties （Honghuadajinyuan， K326， Yunyan85） under different yellowing temperature （34 ℃， 36 ℃， 38 ℃， 40 ℃and 42 ℃） were analyzed， and the degradation kinetic model of flue-cured tobacco leaves’ chlorophyll was established. The results showed that flue-cured tobacco leaves’ chlorophyll content got a faster degradation with the increase of yellowing temperature. There was a lag phase of flue-cured tobacco leaves’ chlorophyll degradation at the low yellowing temperature （such as 34 ℃ and 36 ℃）， however， there was no lag phase at the high yellowing temperature （such as 40 ℃ and 42 ℃）. The chlorophyll degradation of the Yunyan-85 variety was the fastest， followed by the variety of...
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