Journal of Experimental Botany, Vol 49, 1545-1554, Copyright © 1998 by Oxford University Press
J Gerendas, Z Zhu and B Sattelmacher
Nickel is considered to be an essential micronutrient in plants because of
its role in the metalloenzyme urease. In order to characterize the
metabolic consequences of Ni deprivation, the significance of Ni supply for
growth and N metabolism of rice plants grown with either NH4NO3 or urea as
sole N source was evaluated. Growth of plants receiving NH4NO3 was not
affected by the Ni status, and neither were the activities of arginase and
glutamine synthetase. However, urease activity was not detectable in leaves
of low-Ni plants, which in conjunction with arginase action, led to the
accumulation of urea in plants grown with NH4NO3. Amino acid contents and
mineral nutrient status (except Ni) were not affected by the Ni
treatment.Urea-grown Ni-deprived plants showed reduced growth and
accumulated large amounts of urea owing to the lack of urease activity.
These plants were further characterized by low amino acid contents
indicating impaired usage of the N supplied. They also exhibited reduced
levels of the urea precursor arginine, which is merely attributed to the
overall N economy in these plant. When urea-grown plants were supplied with
0.5 mmol m-3 Ni in the nutrient solution, the dry
weight and the amino acid N contents were increased at the expense of the
urea contents, indicating efficient use of urea N in Ni-supplemented
plants.A critical Ni concentration in the shoot regarding dry matter
production of NH4NO3-grown plants could not be deduced, while 25
ARTICLES
Influence of N and Ni supply on nitrogen metabolism and urease activity in rice (Oryza sativa L.)
Institute for Plant Nutrition and Soil Science, University of Kiel, D-24118, Germany; Department of Horticulture, Zhejiang Agricultural University, 310029 Hangzhou, China; Corresponding author; Fax: +49 431 880 1625; E-mail: jgerendas@plantnutrition.uni-kiel.de
g Ni kg-1 DW is certainly
inadequate for urea-grown plants. This suggests that the Ni requirement
strongly depends on the N source employed.Keywords:
Amino acids, ornithine cycle, Ni supply, rice, urea, urease
activity.
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