Differential accumulation of γ‐aminobutyric acid in elicited cells of two rice cultivars showing contrasting sensitivity to the blast pathogen |
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Authors: | G. Forlani M. Bertazzini S. Giberti |
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Affiliation: | Department of Life Science and Biotechnology, University of Ferrara, , Ferrara, Italy |
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Abstract: | Intracellular free amino acid pools were quantified in suspension cultured cells of a blast‐sensitive and a blast‐resistant rice genotype at increasing times after treatment with Magnaporthe oryzae cell wall hydrolysates. Besides some expected variations in free phenylalanine, a remarkable early increase of γ‐aminobutyric acid (GABA) levels was evident in both cultivars. Glutamate decarboxylase activity and protein levels were unaffected. GABA homeostasis was recovered in the sensitive cultivar 48 h after the treatment. In contrast, a further GABA accumulation and a general increase of most amino acids was found at this later stage in the resistant genotype, which showed a larger decrease in cell viability as a consequence of elicitor addition. Data support a recently hypothesised role of GABA metabolism in the plant response to fungal pathogens. |
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Keywords: | Elicitors free amino acids Italian rice genotypes Magnaporthe oryzae γ ‐aminobutyric acid |
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