Jasmonoyl-l-isoleucine is required for the production of a flavonoid phytoalexin but not diterpenoid phytoalexins in ultraviolet-irradiated rice leaves. Issue 10 (2nd October 2016)

• Record Type: Journal Article
• Authors: Miyamoto, Koji; Enda, Isami; Okada, Toshiki; Sato, Yumiko; Watanabe, Kohei; Sakazawa, Tomoko; Yumoto, Emi; Shibata, Kyomi; Asahina, Masashi; Iino, Moritoshi; Yokota, Takao; Okada, Kazunori; Yamane, Hisakazu
• Is Part Of: Bioscience, biotechnology, and biochemistry. Volume 80:Issue 10(2016)
• Page Start: 1934
• Page End: 1938
• Publication Date: 2016-10-02
• Subjects: defense response -- jasmonic acid -- phytoalexin -- rice -- ultraviolet irradiation; Biotechnology -- Periodicals; Biochemistry -- Periodicals; 660.6
• DOI: 10.1080/09168451.2016.1189319
• Languages: English
• ISSNs: 0916-8451

Abstract

Abstract: Rice produces low-molecular-weight antimicrobial compounds known as phytoalexins, in response to not only pathogen attack but also abiotic stresses including ultraviolet (UV) irradiation. Rice phytoalexins are composed of diterpenoids and a flavonoid. Recent studies have indicated that endogenous jasmonyl-l -isoleucine (JA-Ile) is not necessarily required for the production of diterpenoid phytoalexins in blast-infected or CuCl2 -treated rice leaves. However, JA-Ile is required for the accumulation of the flavonoid phytoalexin, sakuranetin. Here, we investigated the roles of JA-Ile in UV-induced phytoalexin production. We showed that UV-irradiation induces the biosynthesis of JA-Ile and its precursor jasmonic acid. We also showed that rice jasmonate biosynthesis mutants produced diterpenoid phytoalexins but not sakuranetin in response to UV, indicating that JA-Ile is required for the production of sakuranetin but not diterpenoid phytoalexins in UV-irradiated rice leaves. Graphical abstract: : Jasmonoyl-l -isoleucine is required for the production of sakuranetin, but not necessarily diterpenoid phytoalexins in UV-irradiated rice leaves.