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Development of PPO,POD activity and contains of total phenols,flavonoid of TN86 in air-curing stage

Chai Jiarong 1 Li Tianfei 1 Yang Hongguang 2 Shang Zhiqiang 1 Liu Jingye 3 Lei liping 1 Huang Xueyue 1 Zi Zhengdong 2 Guan Shijun 2 (1Institute of Tobacco Agricultural Research,Yunnan Academy of Tobacco Science,Yuxi,6531002Binchuan Burley Tobacco Company Ltd.3Department of Biology,Kunming Juniornormal College)  
Two-humped curve of the PPO activity of burley tobacco TN86is observed in the process of air-cur-ing.The first peak is lower and small,whose time value is in0-6d.The second peak scope is bounty,and time value is longer,which is in6-21d,the activity of PPO is mainly in6d leaf browning stage.The activ-ty is two-humped curve as changing of air-curing process.Its high peak is in3d and6d respectively.The first peak,which is in wilting stage,is higher than the second peak value in yellowing.The activity of PPO,POD will increase with the stalk position hoisting.The contains of total phenols,flavonoid will decrease as air-curing goes on,and increase as leaves position goes up,whose containing change is a little later than activity change of PPO,which confirm the relationship of the two.The total phenols of all stalk posi-tions are in the range of0.35%-0.58%after air-curing,which belong to good-quality burley tobacco scope.It is practical for this air-curing study.
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