Presence and oxidation of amino acids in rhizosphere and non-rhizosphere soil |
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Authors: | M A Guirguis F Kunc V Van?ura |
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Institution: | (1) Department of Soil Microbiology, Institute of Microbiology, Czechoslovak Academy of Sciences, Prague 4;(2) Present address: National Research Centre, Dokki-Cairo, UAR |
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Abstract: | Manometric studies were carried out on the respiratory activity of different rhizosphere and non-rhizosphere soils to follow
quantitatively the over-all microbial activity in the rhizosphere soil as affected by the species and growth phase of plant.
Oxygen consumption was distinctly greater in rhizosphere soils as compared to that in non-rhizosphere soils. The difference
between oxygen consumption by rhizosphere and non-rhizosphere soils changed with the course of plant growth and it was not
the same in different plants. This difference in oxygen consumption might be a measure of the amount of available oxidizable
substrate in the rhizosphere. A rhizosphere sample had greater diversity as well as higher concentration of free amino acids
than a non-rhizosphere sample of the same soil. Bacterial counts pointed to preferential stimulation in the rhizosphere of
bacteria requiring individual amino acids. amino acids, such as glycine, alanine, asparsic acid of tyrosine were oxidized
more rapidly in rhizosphere than in non-rhizosphere soil, but the extsent of oxidation for each of the amino acids studied
did not differ. The amount of oxygen consumed during oxidation of alanine, aspartic acid or tyrosine was about one-half of
the total amount necessary for complete oxidation. With glycine a higher extent of oxidation (60%) was observed. These extents
of oxidation of glycine and aspartic acid did not change on investigation at two different phases of plant growth. |
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