GrainGenes Reference Report: JCE-20-315
Reference
JCE-20-315
Title
Allelopathy of oats. II. Allelochemical effect of L-tryptophan and its concentration in oat root exudates
Journal
Journal of Chemical Ecology
Year
1994
Volume
20
Pages
315-319
Author
Kato-Noguchi H Mizutani J Hasegawa K
Abstract
L-tryptophan caused growth inhibition of roots and hypocotyls (or coleoptiles) of cockscomb (Amaranthus caudatus L. , lettuce (Lactuca sativa L. , cress (Lepidium sativum L. , timothy (Phleum pratense L. , rice (Oryza sativa L. , wheat (Triticum aestivum L.), and oat (Avena sativa L.); increasing the dose of L-tryptophan increased the inhibition. The concentrations for 50% inhibition of the root growth were 0.14, 0.15, 0.21, 0.79, 0.95, 1.7, and 2.4 mM for cockscomb, cress, lettuce, timothy, rice, wheat, and oat, respectively; the concentrations for 40% inhibition of the hypocotyl (or coleoptile) growth were 0.28, 0.33, 0.43, 2.7, 4.5, 7.2, and 15 mM for cockscomb, cress, lettuce, timothy, rice, wheat and oat, respectively. The levels of L-tryptophan in oat seedlings and in its root exudates were 29.3 mg/kg fresh wt and 0.25 mM under light conditions, and 21.1 mg/kg fresh wt and 0.18 mM under dark conditions, respectively. The presence of L-tryptophan in the root exudates coupled with its effect on growth suggested that L-tryptophan may play an important role in the growth inhibition of other plants in nature.
Keyword
allelopathy avena sativa growth-inhibitors root-exudates tryptophan
GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture.
GrainGenes Reference Report: JCE-20-315
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GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture. | |||