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Plant Biol (Stuttg) 2007; 9(1): 21-29
DOI: 10.1055/s-2006-924541
Review Article

Georg Thieme Verlag Stuttgart KG · New York

Effect of Ammonium and Nitrate Nutrition On Some Physiological Processes in Higher Plants - Growth, Photosynthesis, Photorespiration, and Water Relations[1]

S. Guo1 , 3 , Y. Zhou1 , Q. Shen1 , F. Zhang2
  • 1College of Resources and Environmental Sciences, Nanjing Agricultural University, Tongwei Road 6, Nanjing, 210095, China
  • 2College of Resources and Environmental Sciences, China Agricultural University, Yuanmingyuanxi Road 2, Beijing, 100094, China
  • 3Institute of Plant Nutrition and Soil Science, Christian-Albrechts-Universität, Hermann-Rodewald-Straße 4, 24098 Kiel, Germany
Further Information

Publication History

Received: March 30, 2006

Accepted: August 3, 2006

Publication Date:
17 October 2006 (online)

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Abstract

Ammonium and nitrate as different forms of nitrogen nutrients impact differently on some physiological and biochemical processes in higher plants. Compared to nitrate, ammonium results in small root and small leaf area, which may contribute to a low carbon gain, and an inhibition on growth. On the other hand, due to (photo)energy saving, a higher CO2 assimilation rate per leaf area was observed frequently in plants supplied with ammonium than in those supplied with nitrate. These results were dependent not only on higher Rubisco content and/or activity, but also on RuBP regeneration rate. The difference in morphology such as chloroplast volume and specific leaf weight might be the reason why the CO2 concentration in the carboxylation site and hence the photorespiration rate differs in plants supplied with the two nitrogen forms. The effect of nitrogen form on water uptake and transportation in plants is dependent both on leaf area or shoot parameter, and on the root activity (i.e., root hydraulic conductivity, aquaporin activity).

Key words

Nitrate - ammonium - photosynthesis - photorespiration.

1 In Memory of Prof. Dr. Burkhard Sattelmacher (August 6, 1947, to November 21, 2005).

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1 In Memory of Prof. Dr. Burkhard Sattelmacher (August 6, 1947, to November 21, 2005).

S. Guo

College of Resources and Environmental Sciences
Nanjing Agricultural University

Tongwei Road 6

Nanjing, 210095

China

Email: sguo@njau.edu.cn

Editor: R. C. Leegood

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