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Titolo:
SEASONAL-CHANGES IN NITROGEN-METABOLISM OF SPRUCE NEEDLES (PICEA-ABIES (L) KARST) AS AFFECTED BY WATER-STRESS AND AMBIENT AIR-POLLUTANTS
Autore:
MANDERSCHEID R; JAGER HJ;
Indirizzi:
FAL,INST ECOTOXICOL,BUNDESALLEE 50 W-3300 BRAUNSCHWEIG GERMANY UNIV GIESSEN,INST PLANT ECOL W-6300 GIESSEN GERMANY
Titolo Testata:
Journal of plant physiology
fascicolo: 4, volume: 141, anno: 1993,
pagine: 494 - 501
SICI:
0176-1617(1993)141:4<494:SINOSN>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
FREE AMINO-ACIDS; NORWAY SPRUCE; SCOTS PINE; HIGHER-PLANTS; FOREST TREES; OZONE; HYPOTHESIS; SEEDLINGS; PROTEIN; LEAVES;
Keywords:
PICEA-ABIES; AIR POLLUTION; GLUTAMATE DEHYDROGENASE; GLUTAMINE SYNTHETASE; NITRATE; SOLUBLE AMINO ACIDS; SOLUBLE PROTEIN; WATER STREES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
R. Manderscheid e H.J. Jager, "SEASONAL-CHANGES IN NITROGEN-METABOLISM OF SPRUCE NEEDLES (PICEA-ABIES (L) KARST) AS AFFECTED BY WATER-STRESS AND AMBIENT AIR-POLLUTANTS", Journal of plant physiology, 141(4), 1993, pp. 494-501

Abstract

Sixteen-year-old spruce trees (Picea abies) enclosed in their naturalhabitat in open-top chambers with charcoal-filtered and non-filtered air were studied from 1988-1991 to evaluate the long-term impact of ambient air pollutants on needle nitrogen metabolism (contents of soluble protein and amino acids and activities of glutamine synthetase and glutamate dehydrogenase). Investigation of diurnal variations in soluble amino acid contents revealed a maximum of glutamate, serine and glycine and a minimum of aspartate at noon. The typical ontogenetic curvesin nitrogen metabolism of young needles from flushing until October of the next year consisted of distinct phases: (1) within the first vegetation period a strong increase in needle protein and enzyme activities, (2) during winter a decrease in amino acid content, (3) in springtime a maximum in amino acid content, (4) in early summer a temporary decrease in protein content, and (5) in late summer an increase in arginine content in some trees. Beside seasonal changes, levels of the parameters were found to vary strongly between trees and over the four years of investigation. No relationship could be found between parameters of needle nitrogen metabolism and soil nitrate or ammonium concentrations. However, there was a relationship between the soil water potential and protein content (r = 0.8) and glutamine synthetase activity (r= 0.6) in the needles, indicating that both parameters increase underconditions of water stress. These physiological alterations are supposed to be based on stress-induced translocation of nitrogen from the old to the young foliage. Trees kept in chambers with non-filtered air showed higher levels of protein and glutamine synthetase activity thantrees of the clean air treatment. However, the edaphic data indicate this hardly to be an effect of ambient ozone levels, but of differences in soil water status between the two variants.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 05:20:13