biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 50:69-73, 2006 | DOI: 10.1007/s10535-005-0076-8

The effect of elevated CO2 concentration on leaf chlorophyll and nitrogen contents in rice during post-flowering phases

M. Moynul Haque1,*, A. Hamid1, M. Khanam2, D. K. Biswas1, M. A. Karim1, Q. A. Khaliq1, M. A. Hossain3, D. C. Uprety4
1 Department of Agronomy, BSMR Agricultural University, Salna, Gazipur, Bangladesh
2 Plant Physiology Division, BRRI, Joydebpur, Gazipur, Bangladesh
3 Agronomy Division, BARI, Joydebpur, Gazipur, Bangladesh
4 Plant Physiology Division, IARI, New Delhi, India

The effect of elevated CO2 concentration (CE) on leaf chlorophyll (Chl) and nitrogen (N) contents and photosynthetic rate (PN) was evaluated during the post-flowering stages of rice grown at CE (570 ± 50 µmol mol-1) in open top chamber (OTC), at ambient CO2 concentration (∼ 365 µmol mol-1) in OTC and at open field. Thirty-five day old seedlings were transplanted in OTCs or in field and allowed to grow till maturity. Chl and N contents were highest at the time of flowering and thereafter it started to decline. The rate of decline in Chl and N contents was faster in plants grown under CE mostly in later part of growth. Irrespective of treatment difference, flag leaf contained the highest amount of Chl and N than penultimate and third leaf. The higher PN was observed in leaves under CE than in the leaves in other two growing conditions. Considering growth stage, PN was the highest at flowering which reduced at the later part of growth due to degradation of Chl and N content of the leaf. Under CE it was 40.02 µmol m-2 s-1 at flowering and it reduced to only 14.77 µmol m-2 s-1 at maturity stage. The beneficial effect of CE in increasing leaf PN may be maintained by applying extra dose of nitrogen at the later stages of plant growth.

Keywords: open top chamber; photosynthesis; Oryza sativa L.
Subjects: chlorophyll a,b; CO2 concentration, elevated, enrichment; flowering; gas exchange; leaf anatomy, morphology; N2-fixing nodules; nitrogen, dinitrogen fixation; open-top chamber; Oryza sativa; rice; root, rooting

Received: November 17, 2003; Accepted: February 11, 2005; Published: March 1, 2006  Show citation

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Moynul Haque, M., Hamid, A., Khanam, M., Biswas, D.K., Karim, M.A., Khaliq, Q.A., Hossain, M.A., & Uprety, D.C. (2006). The effect of elevated CO2 concentration on leaf chlorophyll and nitrogen contents in rice during post-flowering phases. Biologia plantarum, 50(1), 69-73. doi: 10.1007/s10535-005-0076-8
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