Journal article

Authors list: WEIGEL, HJ; PRIEBE, A; JAGER, HJ

Publication year: 1982

Pages: 113-124

Journal: Flora

Volume number: 172

Issue number: 2

ISSN: 0367-2530

eISSN: 1618-0585

Publisher: Elsevier

Abstract: 
Some aspects of N metabolism of 2 A. tenuis populations of different Zn sensitivity originating from a Violetum calaminariae westfalicum at Blankenrode, FRG (51.degree. 32N 8.degree. 33E) were investigated. As defined by growth and yield reduction, both populations, the natural habitat of which is characterized by soil Zn concentrations of 8.335 mg Zn/kg and 62.138 mg Zn/kg dry soil, respectively, behaved differently towards an experimental Zn treatment of 37,500-75,000 mg Zn/kg dry soil. At the 75,000 mg Zn/kg treatment, the population originating from the low Zn soil was Zn-sensitive, while no growth retardation occurred with the population originating from the high Zn soil. Total protein content and the activities of the enzyme glutamate dehydrogenase and malate dehydrogenase were in the same order of magnitude in both populations, and were not influenced by any of the Zn treatments. The proportion of non-dialyzable Zn increased with increasing plant Zn concentrations in both populations. Free amino acids and free and bound polyamines did not differ qualitatively between the 2 populations. The sum of the concentrations of all amino acids investigated increased with increasing plant Zn concentrations in the Zn-sensitive population, this increase being mainly caused by an increase of the concentrations of the amides glutamine and asparagine. In the Zn-tolerant population, the concentrations of the free amino acids were lower as compared to the control plants of the Zn-sensitive population at soil Zn concentrations (75,000 mg/kg), which were in the same order of magnitude as in the soil of the populations natural habitat. Evidently, the free amino acids investigated do not function as complexing agents for heavy metal tolerant plant species. The significance of the decrease in the concentrations of free polyamines in the Zn-sensitive population at high soil Zn concentrations should be elucidated by further investigations.

Harvard Citation style: WEIGEL, H., PRIEBE, A. and JAGER, H. (1982) COMPARATIVE INVESTIGATIONS ON THE NITROGEN-METABOLISM OF 2 AGROSTIS-TENUIS POPULATIONS FROM A METALLIFEROUS WASTE, Flora, 172(2), pp. 113-124

APA Citation style: WEIGEL, H., PRIEBE, A., & JAGER, H. (1982). COMPARATIVE INVESTIGATIONS ON THE NITROGEN-METABOLISM OF 2 AGROSTIS-TENUIS POPULATIONS FROM A METALLIFEROUS WASTE. Flora. 172(2), 113-124.