Physiological role of rice gibberellin inactivation pathway induced by rice blast infection.

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Gibberellins (GAs) are a class of plant hormones that promote growth in various stages of plant lifecycle: seed germination, stem elongation, leaf expansion and flowering and fruit growth. Meanwhile, recent reports revealed that gibberellin signal is involved in disease response. In this study, to clarify the physiological role of upregulation of a rice gene, encoding a GA inactivation enzyme and decreased levels of bioactive GAs in rice blast infected leaves. Our results suggested that this phenomenon might be one of the defensive reactions in rice.