Journal
PLANT BIOLOGY
Volume 16, Issue 6, Pages 1127-1132Publisher
WILEY
DOI: 10.1111/plb.12165
Keywords
Elicitors; free amino acids; Italian rice genotypes; Magnaporthe oryzae; -aminobutyric acid
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Funding
- Italian MIUR
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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 -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 48h 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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