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Effects of nitrogen infiltration into plant tissue on the metabolism of carbon, with special reference to Themeda triandra Forssk

Abstract

The infiltration of nitrate and ammonia into Themeda triandra and Zea mays leaf tissue influenced the carbon dioxide gas exchange characteristics: 1) the carbon dioxide compensation point increased, 2) the net photosynthetic rate was increased by the nitrate ion and decreased by the ammonium ion, and 3) dark respiration was unaffected. /sup 14/CO/sub 2/ assimilation and the partitioning of /sup 14/C by Themeda triandra leaves were influenced by the infiltration of both forms of nitrogen; the amino acid fraction changed in both composition and concentration. Nitrogen infiltration increased the activities of the following enzymes: aspartate amino-transferase, PEP carboxylase and RuBP carboxylase. Methionine sulphoximine (inhibitor of glutamate synthetase) increased the carbon dioxide compensation point and formate pool size. Infiltration of nitrate and ammonia enhanced the /sup 14/C uptake from labelled glycolate, glyoxylate and formate into the water soluble fraction of Themeda triandra leaves. The activities of RuBP carboxylase and RuBP oxygenase (to a greater extent) were increased by the addition of nitrate and ammonia in vitro.
Authors:
Publication Date:
Jan 01, 1983
Product Type:
Book
Reference Number:
EDB-85-098325
Resource Relation:
Other Information: Thesis
Subject:
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; 59 BASIC BIOLOGICAL SCIENCES; CARBON; METABOLISM; CARBOXYLASE; ENZYME ACTIVITY; NITROGEN; BIOLOGICAL EFFECTS; TRANSFERASES; AMMONIA; CARBON 14 COMPOUNDS; CARBON DIOXIDE; LEAVES; MAIZE; METHIONINE; NITRATES; PHOTOSYNTHESIS; PLANT TISSUES; RESPIRATION; TRACER TECHNIQUES; AMINO ACIDS; BODY; CARBON COMPOUNDS; CARBON OXIDES; CARBOXYLIC ACIDS; CEREALS; CHALCOGENIDES; CHEMICAL REACTIONS; DRUGS; ELEMENTS; ENZYMES; GRASS; HYDRIDES; HYDROGEN COMPOUNDS; ISOTOPE APPLICATIONS; LABELLED COMPOUNDS; LIGASES; LIPOTROPIC FACTORS; NITROGEN COMPOUNDS; NITROGEN HYDRIDES; NONMETALS; ORGANIC ACIDS; ORGANIC COMPOUNDS; ORGANIC SULFUR COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PHOTOCHEMICAL REACTIONS; PLANTS; SYNTHESIS; TISSUES; 560303* - Chemicals Metabolism & Toxicology- Plants- (-1987); 550501 - Metabolism- Tracer Techniques
OSTI ID:
5747967
Country of Origin:
South Africa
Language:
English
Submitting Site:
HEDB
Size:
Pages: v
Announcement Date:
Jun 01, 1985

Citation Formats

Amory, A M. Effects of nitrogen infiltration into plant tissue on the metabolism of carbon, with special reference to Themeda triandra Forssk. South Africa: N. p., 1983. Web.
Amory, A M. Effects of nitrogen infiltration into plant tissue on the metabolism of carbon, with special reference to Themeda triandra Forssk. South Africa.
Amory, A M. 1983. "Effects of nitrogen infiltration into plant tissue on the metabolism of carbon, with special reference to Themeda triandra Forssk." South Africa.
@misc{etde_5747967,
title = {Effects of nitrogen infiltration into plant tissue on the metabolism of carbon, with special reference to Themeda triandra Forssk}
author = {Amory, A M}
abstractNote = {The infiltration of nitrate and ammonia into Themeda triandra and Zea mays leaf tissue influenced the carbon dioxide gas exchange characteristics: 1) the carbon dioxide compensation point increased, 2) the net photosynthetic rate was increased by the nitrate ion and decreased by the ammonium ion, and 3) dark respiration was unaffected. /sup 14/CO/sub 2/ assimilation and the partitioning of /sup 14/C by Themeda triandra leaves were influenced by the infiltration of both forms of nitrogen; the amino acid fraction changed in both composition and concentration. Nitrogen infiltration increased the activities of the following enzymes: aspartate amino-transferase, PEP carboxylase and RuBP carboxylase. Methionine sulphoximine (inhibitor of glutamate synthetase) increased the carbon dioxide compensation point and formate pool size. Infiltration of nitrate and ammonia enhanced the /sup 14/C uptake from labelled glycolate, glyoxylate and formate into the water soluble fraction of Themeda triandra leaves. The activities of RuBP carboxylase and RuBP oxygenase (to a greater extent) were increased by the addition of nitrate and ammonia in vitro.}
place = {South Africa}
year = {1983}
month = {Jan}
}