Nickel Deficiency Disrupts Metabolism of Ureides, Amino Acids, and Organic Acids of Young Pecan Foliage
| Autor: | C. C. Reilly, Cheng Bai, Bruce W. Wood |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Allantoic acid
Arginine Physiology Carboxylic Acids Plant Science Biology chemistry.chemical_compound Heterocyclic Compounds Nickel Valine Genetics Urea Amino Acids Chromatography High Pressure Liquid Carya Plant Diseases chemistry.chemical_classification Catabolism Tryptophan Metabolism Urease Amino acid Plant Leaves Biochemistry chemistry Glycine Spectrophotometry Ultraviolet Research Article |
| Zdroj: | Plant Physiology. 140:433-443 |
| ISSN: | 1532-2548 0032-0889 |
| DOI: | 10.1104/pp.105.072983 |
| Popis: | The existence of nickel (Ni) deficiency is becoming increasingly apparent in crops, especially for ureide-transporting woody perennials, but its physiological role is poorly understood. We evaluated the concentrations of ureides, amino acids, and organic acids in photosynthetic foliar tissue from Ni-sufficient (Ni-S) versus Ni-deficient (Ni-D) pecan (Carya illinoinensis [Wangenh.] K. Koch). Foliage of Ni-D pecan seedlings exhibited metabolic disruption of nitrogen metabolism via ureide catabolism, amino acid metabolism, and ornithine cycle intermediates. Disruption of ureide catabolism in Ni-D foliage resulted in accumulation of xanthine, allantoic acid, ureidoglycolate, and citrulline, but total ureides, urea concentration, and urease activity were reduced. Disruption of amino acid metabolism in Ni-D foliage resulted in accumulation of glycine, valine, isoleucine, tyrosine, tryptophan, arginine, and total free amino acids, and lower concentrations of histidine and glutamic acid. Ni deficiency also disrupted the citric acid cycle, the second stage of respiration, where Ni-D foliage contained very low levels of citrate compared to Ni-S foliage. Disruption of carbon metabolism was also via accumulation of lactic and oxalic acids. The results indicate that mouse-ear, a key morphological symptom, is likely linked to the toxic accumulation of oxalic and lactic acids in the rapidly growing tips and margins of leaflets. Our results support the role of Ni as an essential plant nutrient element. The magnitude of metabolic disruption exhibited in Ni-D pecan is evidence of the existence of unidentified physiological roles for Ni in pecan. |
| Databáze: | OpenAIRE |
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