奨励賞
ジャスモン酸の病傷害応答におけるシグナル伝達に関する研究
2022 年 57 巻 1 号 p. 1-7
詳細
2022 年 57 巻 1 号 p. 1-7
Jasmonic acid (JA) and its biologically active form jasmonoyl isoleucine (JA-Ile) regulate plant growth, development, and defense responses to disease and wounding stresses. First, we attempted to elucidate JA signaling in rice. We focused on a rice JA-responsive bHLH transcription factor RERJ1 and found that the expression of RERJ1 is tightly regulated by JA accumulation in rice leaves treated with wounding or drought stresses. We also identified JA-responsive cis-elements in the upstream region of OsChia4a, which encodes a rice chitinase, suggesting that a bHLH transcription factor regulates its inductive expression. In addition, we revealed that RERJ1 regulates defense response against insect herbivores. These results indicated the contribution of RERJ1 on rice JA signaling.
In contrast to vascular plants, not JA but 12-oxo-phytodienoic acid (OPDA) and its related compounds are bioactive in bryophytes. We found that OPDA and its related compounds have biological activity in momilactone-producing moss Calohypnum plumiforme. We also showed that OPDA signaling components are conserved in C. plumiforme, as in the other bryophytes. This review summarizes our studies regarding the signal transduction of JA and its related compounds in disease and wounding stress responses.
