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Effects of population and fertilization on enzymes activities,proline and propyldiformaldehyde in oriental tobacco mature leaves

Qu Shengbin 1 Yang Shibo 1 Li Guangxi 1 Song Yuchuan 1 Huo Yuchang 1 Liu Jingye 2 (1Tobacco Science Institute Baoshan Aromatic Tobacco Company Baoshan6780002Department of Biology,Kunming Juniornormal College)  
Effects of different field population and level of fertilization on oriental tobacco leaves was studied,the results showed as the follows:(1)The activities of NR,POD and the content of propyl diformaldehyde increase with the decrease of population and the increase of nitrogen fertilizer application.(2)The effects of reciprocal contribution of population and rate of fertilizer application lead to no significant difference in the activity of POD among treatments.(3)The effects of population and rate of fertilizer application on the activity of NR are similar to that of POD,while effect of rate of fertilizer application on proline content is more than that of population.(4)The results prove the outcomes of studies carried on other crops and tobacco types by other people,that is the change pattern of proline content is contrary to that of propyl -diformaldehyde,which is also in correspondence with the theory on this respect.
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