TY  - JA
AU  - Kato Noguchi,H.
AU  - Hasegawa,K.
AU  - Mizutani,J.
TI  - Allelopathy of oats. II. Allelochemical effect of L-tryptophan and its concentration in oat root exudates
SN  - 0098-0331
U1  - 95-115553 
PY  - 1994///
KW  - Amino acids
KW  - Avena
KW  - Biological competition
KW  - Gramineae
KW  - Heterocyclic compounds
KW  - Indoles
KW  - Miscellaneous plant disorders
KW  - Plant anatomy
KW  - AGROVOC
KW  - Plant growth substances
KW  - Plant vegetative organs
N1  - references US (DNAL QD415.A1J6)
N2  - 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
T2  - Journal of chemical ecology (USA). (Feb 1994). v. 20(2) p. 315-319
ER  -