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Modification of allelopathic effects ofp-coumaric acid on morning-glory seedling biomass by glucose, methionine, and nitrate

Studies of allelopathy have emphasized primarily the identification and quantification of phytotoxins in soils, with only limited attention directed toward how organic (carbon) and inorganic constituents (nutrients) in the soil may modify the action of such phytotoxins. In the present study, increasing carbon (C) levels (up to 108μg C/g soil) supplied as glucose, phenylalanine, orp-hydroxybenzoic acid did not alter morning-glory biomass, but similar C levels supplied as leucine, methionine, orp-coumaric acid were inversely related to morning-glory biomass. Similar joint action and multiplicative analyses were used to describe morning-glory biomass response to various C sources and to generate dose isolines for combinations ofp-coumaric acid and methionine at two NO₃-N levels and for combinations ofp-coumaric acid and glucose at one NO₃-N level. Methionine, glucose, and NO₃-N treatments influenced the inhibitory action ofp-coumaric acid on biomass production of morning-glory seedlings. For example, results from the multiplicative analysis indicated that a 10% inhibition of morning-glory biomass required 7.5μgp-coumaric acid/g soil, while the presence of 3.68μg methionine/g soil thep-coumaric acid concentration required for 10% inhibition was only 3.75μg/ g soil. Similar response trends were obtained forp-coumaric acid and glucose. The higher NO₃-N (14 vs. 3.5μg/g) treatments lowered the methionine and increased thep-coumaric acid concentrations required for 10% inhibition of morning-glory biomass. These results suggested that allelopathic interactions in soil environments can be a function of interacting neutral substances (e.g., glucose), promoters (e.g., NO₃-N), and/or inhibitors (e.g., methionine andp-coumaric acid) of plant growth.

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1. Department of Botany, North Carolina State University, 27695, Raleigh, North Carolina

   Udo Blum

2. Department of Statistics, North Carolina State University, 27695, Raleigh, North Carolina

   T. M. Gerig

3. Department of Crop Science, North Carolina State University, 27695, Raleigh, North Carolina

   A. D. Worsham

4. Department of Soil Science, North Carolina State University, 27695, Raleigh, North Carolina

   L. D. King

1. Udo Blum
2. T. M. Gerig
3. A. D. Worsham
4. L. D. King

The use of trade names in this publication does not imply endorsement by the North Carolina Agricultural Research Service of products named, nor criticism of similar ones not mentioned.

Blum, U., Gerig, T.M., Worsham, A.D. et al. Modification of allelopathic effects ofp-coumaric acid on morning-glory seedling biomass by glucose, methionine, and nitrate. J Chem Ecol 19, 2791–2811 (1993). https://doi.org/10.1007/BF00980584

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• Received: 25 March 1993

• Accepted: 21 July 1993

• Issue Date: December 1993

• DOI: https://doi.org/10.1007/BF00980584

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