Flue-curing Characteristics of'Yunyan116'in the Weining Tobacco Region
To investigate the flue-cured traits of'Yunyan116'in high-altitude tobacco regions and enhance the quality and profitability of cured tobacco leaves,this research employed a process sampling approach to analyze the variations in moisture content,SPAD value,polyphenol oxidase(PPO)activity,and key chemical components of moderately ripe tobacco leaves during the flue-curing process in Weining,Guizhou.The results indicated that the decrease rate of moisture content and SPAD value of tobacco leaves exhibited a'slow-fast-slow'decrease during the flue-curing process,resulting in a water loss balance of 1.2.The SPAD value decreased by 93.9%from flue-curing to the early stage of color setting,meeting the standard for good flue-curing ability.The PPO activity exhibited a'double peak'curve trend while undergoing the flue-curing process,averaging at 0.35 U,falling within the moderate flue-curing resistance range.The ease of curing and resistance to curing during the flue-curing process were both related to the primary chemical components found in tobacco leaves.The tobacco leaves of'Yunyan116'exhibited moderate to good flue-curing characteristics in the Weining tobacco region due to the ease and durability of its middle leaves.During the late yellowing and early coloring stages of tobacco flue-curing,it is crucial to control the relative humidity of the curing room carefully to prevent oxidation and browning of the tobacco leaves.
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