Effect of Nitrogen Topdressing on the Key Enzymes of Carbon and Nitrogen Metabolism During the Process of Tobacco Leaf Maturation

doi:10.3321/j.issn:1000-7091.2005.03.019

Abstract

Abstract: The nitrate reductase and invertase activity were detected to study the effect of dressing on the level and conversion of carbon and nitrogen metabolism during the maturation of tobacco leaves by pot test. The results indicated that during the process of upper-leaf and lowerleaf maturing, the nitrate reductase and invertase activity decreased. With the postponing of topdressing stage and increasing of topdressing amount, the nitrate reductase and invertase activity of lower-leaf raised, Inv/NR decreased, and the transferring of curve was postponed. In 30 days of transplanting or when the topdressing amount was less then 30 percent of the total N fertilizer amount, the nitrate reductase and invertase activity and Inv/NR of upper-leaf decreased with postponing dressing stage or increasing N amount. In this test, it was 30 days after transplanting or 30 percent of N topdressing amount to the total N fertilizer amount that was propitious to corresponding and transforming of carbon and nitrogen metabolism during the process of upper-leaf and lower-leaf maturing.

Key words: Topdressing, Flue-cured tobacco, Nitrate reductase, Invertase

CLC Number:

S572.01

LIU Wei-qun, CHEN Liang-cun, ZHEN Huan-ju, SHI Yong-chun. Effect of Nitrogen Topdressing on the Key Enzymes of Carbon and Nitrogen Metabolism During the Process of Tobacco Leaf Maturation[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2005, 20(3): 74-78. doi: 10.3321/j.issn:1000-7091.2005.03.019.

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