Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (24): 4988-4997.doi: 10.3864/j.issn.0578-1752.2012.24.004

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY·AGRICULTURE INFORMATION TECHNOLOGY • Previous Articles     Next Articles

Changes of Cell Ultrastructure of Flue-Cured Tobacco Leaves with Different Maturities During Bulk Flue-Curing

 LIU  Chao-Ying, XU  Zi-Cheng, SHAO  Hui-Fang, SONG  Chao-Peng, YANG  Jie, GENG  Zong-Ze, ZHAO  Shuang, ZHANG  Li-Ying   

  1. 1.College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002
    2.China Tobacco Chuanyu Industrial Corporation, Chengdu 610066
    3.Chongren Branch of Fuzhou Tobacco Company, Fuzhou 344000, Jiangxi
  • Received:2012-06-05 Online:2012-12-15 Published:2012-10-26

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Abstract: 【Objective】The flue-cured tobacco cv. Honghuadajinyuan (hereafter referred as “HD”) was taken as experimental material to study the changes of cell ultrastructure of tobacco leaves during bulk-curing, which intended to provide a theoretical basis for harvesting maturity and optimization of curing technique of HD. 【Method】Tobacco leaves of different maturities were cured in the bulk flue-curing room, the cell ultrastructures of which were studied respectively at key temperature points (38℃, 42℃, 48℃) during the flue-curing process. 【Result】 Results of cell ultrastructure observation showed that the differences of cell structures of fresh tobacco leaves among various maturity degrees were mainly showed by the extent of chloroplast adhering to cell wall and the size of intercellular space. Chloroplast, nucleus and related membrane structure changed most obviously during the flue-curing process. Moreover, the yellowing process was the key stage for degradation of starch and pigmentary substances in tobacco leaves. Compared with the mature and over-ripe tobacco leaves, those harvested when optimally matured was beneficial to the transformation of carbohydrates and further degradation of starch and pigmentary substances, by which the quality traits of tobacco leaves could also be improved at the same time.【Conclusion】Harvesting at an optimum maturity was quite essential for the improvement of leaf structure and quality.

Key words: flue-cured , cell ultrastructure , maturity , bulk flue-curing

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