Changes in Amino Acid and Amine Contents of Susceptible Tomato Cultivars Infected with Alternaria alternata Tomato Pathotype or Treated with AL-toxin.
Year: 1991
Type: article
Abstract: The changes in amino acid and amine contents of susceptible and resistant tomat cultivars infected with Alternaria alternata tomato pathotype or treated with its host-selecti AL-toxin were investigated.AL-toxin has been known as a potential inhibitor of aspartat carbamoyltransferase (ACTase) in susceptible tomato plants.Inhibition of ACTase shoul result in the accumulation of aspartic acid in the susceptible plant treated with AL-toxi In this study, however, no difference was observed in the amount of aspartic acid and othe amino acids between toxin-treated and non-treated leaves of the susceptible and resist cultivars until at least 24hr after treatment.In the susceptible tomato plants inoculat with spores at the base of the stem, amino acid contents in leaflets showing necrotic sympt were similar to that in corresponding leaflets without symptom.Aspartic acid content in symptom-developed leaflets was rather lower than that in symptom-less ones.These resul do not support the hypothesis that AL-toxin inhibits ACTase.On the other hand, two amines, ethanolamine and phosphoethanolamine, markedly accumulated in susceptib tomato leaves 12 to 24hr after toxin treatment, but not in resistant ones.The increase in these amines was also observed in symptom-developing leaflets but not in symptomless ones of plants inoculated with the spores of the pathogen.These results suggest that AL-toxi induces disorder of metabolism related to these amines in susceptible tomato cells.(
Source: 日本植物病理學會報
Institution: Nagoya University
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W2089540819