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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (12): 2288-2295.doi: 10.3724/SP.J.1006.2009.02288

• RESEARCH ACTIVITIES • Previous Articles     Next Articles

Effects of Planting Density on Photosynthetic Characteristics and Assimilate Accumulation of Leaves in Different Positions in Flue-Cured Tobacco

WANG Rui1,LIU Guo-Shun1,*,NI Guo-Shi2,BI Qing-Wen3,YANG Li-Bo3,ZHEN Cai-Hong1   

  1. 1National Tobacco cultivation & Physiology & Biochemistry Research Center,Henan Agricultural University,Zhengzhou 450002,China;2Tobacco Company in Enshi Prefecture,Enshi 445500,China;3Hubei Tobacco Industry Limited Liability Company,Wuhan 430051,China
  • Received:2009-05-15 Revised:2009-07-21 Online:2009-12-10 Published:2009-10-13
  • Contact: LIU Guo-Shui,E-mail:liugsh1851@163.com

Abstract:

The leaves in threepositions(leaf 5, 11, 17 from bottom to top) of flue-cured tobacco Yunyan 87 with four planting densities (16 665, 15 150, 13 875, and 12 825 plants ha-1)were tested in the field experiment in Liangfeng Village, Xuanen County, Chinain 2008. The results indicated thatthe net photosynthetic rate (Pn), specific leaf weight and carbohydrate content exhibited significant difference under various planting densities in mature period (60 days after transplanting), and the impact of plant density increased in the process of leaf development. With the decrease of planting density, the decline rate of Pn was reduced, photosynthetic function decline was delayed, and the accumulating time of assimilate was prolonged. The lower leaf did not appear photosynthetic midday depression under three planting densities except under the lowest density (12 825 plants ha-1). The upper leaf appeared photosynthetic midday depression under all the planting densities. Degree of photosynthetic midday depression for the middle leaf was lightened under lower densities. Under planting density of 15 150 plants ha-1, the middle leaf had higherdaily photosynthesis and assimilate, and the photosynthesis and transpiration achieved the most coordinate state, exhibiting higher single-leaf WUE.

Key words: Planting density, Flue-cured tobacco, Photosynthetic character, Diurnal change, Assimilation

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