J Integr Plant Biol. ›› 2013, Vol. 55 ›› Issue (8): 775-784.DOI: 10.1111/jipb.12057

Special Issue: Rice Genomics and Agriculture

• Molecular Ecology and Evolution • Previous Articles    

Response of Rice to Insect Elicitors and the Role of OsJAR1 in Wound and Herbivory-induced JA-Ile Accumulation

Kaori Fukumoto1, Kabir Md Alamgir1, Yuko Yamashita1, Izumi C. Mori1, Hideyuki Matsuura2 and Ivan Galis1*   

  1. 1Institute of Plant Science and Resources, Okayama University, Kurashiki, Japan
    2Division of Applied Bioscience, Research Faculty of Agriculture, Hokkaido University, Sapporo, Japan

Abstract:

Plants produce jasmonic acid (JA) and its amino acid conjugate, jasmonoyl-L-isoleucine (JA-Ile) as major defense signals in response to wounding and herbivory. In rice (Oryza sativa), JA and JA-Ile rapidly increased after mechanical damage, and this increase was further amplified when the wounds were treated with oral secretions from generalist herbivore larvae, lawn armyworms (Spodoptera mauritia), revealing for the first time active perception mechanisms of herbivore-associated elicitor(s) in rice. In the rice genome, two OsJAR genes can conjugate JA and Ile and form JA-Ile in vitro; however, their function in herbivory-induced accumulation of JA-Ile has not been investigated. By functional characterization of TOS17 retrotransposon-tagged Osjar1 plants and their response to simulated herbivory, we show that OsJAR1 is essential for JA-Ile production in herbivore-attacked, field-grown plants. In addition, OsJAR1 was required for normal seed development in rice under field conditions. Our results suggest that OsJAR1 possesses at least two major functions in rice defense and development that cannot be complemented by the additional OsJAR2 gene function, although this gene previously showed overlapping enzyme activity in vitro.

Fukumoto K, Alamgir KM, Yamashita Y, Mori IC, Matsuura H, Galis I (2013) Response of rice to insect elicitors and the role of OsJAR1 in wound and herbivory‐induced JA‐Ile accumulation. J. Integr. Plant Biol. 55(8), 775–784.

Key words: JAR enzyme, jasmonate signaling, jasmonic acid, jasmonoyl-l-isoleucine, rice, Oryza sativa

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