Kana Miyata
The phytohormone jasmonate has a wide range of functions in plant growth, development, reproduction, and defense responses. Jasmonoyl-isoleucine, the biologically active form of jasmonate, is recognized by the COI1 receptor. In this issue, Inagaki et al. (on pp. 405-421) have found that among the three COI1 homologs in rice, OsCOI2 is the primary receptor that regulates fertility, senescence, and defense responses.