变黄前期失水胁迫对烟叶烘烤特性的影响

【目的】研究变黄前期失水胁迫对烟叶烘烤特性的影响,为烟叶烘烤工艺优化提供理论依据。【方法】以红花大金元中部叶为试验材料,通过对变黄前期烟叶进行不同失水胁迫程度处理,研究其暗箱试验烘烤特性,并探讨其烘烤过程中的水分、色素、淀粉含量变化及烘烤质量。【结果】随着烟叶失水胁迫程度的增加,暗箱中烟叶的变黄时间缩短、变黄指数增大,烟叶变褐时间延长、变褐指数增大,但变褐发生时间提前;随着变黄前期烟叶失水胁迫程度的增加,烘烤过程中烟叶叶绿素、类胡萝卜素和淀粉降解加快,烤后烟叶等级质量有所提高。【结论】变黄前期烟叶失水胁迫可加快烟叶色素和淀粉降解,促进烟叶变黄,改善烟叶烘烤特性。

Effects of dehydration stress on flue-curing characteristics of tobacco leaves at early yellowing stage

Objective]The present study investigated effects of dehydration stress on curing characteristics of tobacco leaves at early yellowing stage, in order to provide theoretical basis for optimization of curing process. Method]Using middle leaves of Honghuadajinyuan cultivar as test material, through the treatments on tobacco leaves with different dehy-dration stress degrees at early yellowing stage, the flue-curing characteristics in black box test, changes of moisture, pig-ment content, starch content and flue-cured quality were studied. Result]With increasing of tobacco leaf dehydration stress degree, yellowing time of tobacco leaves shortened in black box, yellowing index decreased, browning time of tobacco leaves extended, browning index increased, but browning of tobacco leaves occurred in advance. Degradation of chlorophyll, carotenoid and starch in tobacco leaves accelerated along with the increase of dehydration stress degree at early yellowing stage, and quality of flue-cured tobacco leaves improved. Conclusion]Dehydration stress treatment at early yellowing stage can accelerate degradation of pigment and starch, promote yellowing of tobacco leaves, and improve flue-curing characteristics of tobacco leaves.