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EXUDATION OF 14 C‐LABELLED COMPOUNDS FROM WHEAT ROOTS: INFLUENCE OF NUTRIENTS, MICRO‐ORGANISMS AND ADDED ORGANIC COMPOUNDS
Author(s) -
ROVIRA A. D.,
RIDGE E. H.
Publication year - 1973
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1973.tb02085.x
Subject(s) - chemistry , nutrient , sodium acetate , phosphate , inoculation , phosphate buffered saline , horticulture , biology , organic chemistry , chromatography
SUMMARY When tops of 6‐day wheat seedlings grown in nutrient solution, sterile or inoculated with soil, received 14 CO 2 , it was found that the radioactivity of the solution measured after 24 and 48 hours was reduced by the presence of micro‐organisms. Omission of phosphate from the sterile growth medium reduced the radioactivity of the root solution to 47% of the control. The addition of acetate buffer at pH 5 greatly increased exudation whereas the adjustment to a similar pH with H 2 SO 4 or universal buffer or the addition of sodium acetate at pH 7 significantly reduced exudation. These results demonstrate that exudation of organic compounds from roots can be affected by the addition of substrates and butters used in root enzyme studies. From these results, it appears that some organic compounds in soil could influence the loss of carbon compounds from roots growing under natural conditions.