Arabidopsis mutants affecting oxylipin signaling in photo-oxidative stress responses

作者：Satoh Masanori; Tokaji Yoshihito; Nagano Atsushi J; Hara Nishimura Ikuko; Hayashi Makoto; Nishimura Mikio; Ohta Hiroyuki; Masuda Shinji^*

来源：Plant Physiology and Biochemistry, 2014, 81: 90-95.

DOI：10.1016/j.plaphy.2013.11.023

• Arabidopsis
• Heat shock response
• HsfA2
• OPDA
• Oxidative stress
• Oxylipin
• Reactive oxygen species

Plant oxylipins derive from oxygenation of polyunsaturated fatty acids in thylakoid membranes and oxylipins such as jasmonic acid (JA) and 12-oxo-phytodienoic acid (OPDA) play important roles in adaptation to photo-oxidative stress. OPDA functions both as a JA precursor and as a biologically active signaling molecule that induces expression of a specific set of genes. These genes can be induced by OPDA in the JA-insensitive coronatine insensitive1 (coi1) mutant, suggesting that there is an alternative pathway for OPDA signaling, independent of COI1-dependent JA signaling. However, little is known about OPDA signaling in photo-oxidative stress responses. In this study, we isolated Arabidopsis mutants with constitutively enhanced expression from the OPDA-responsive HsfA2 promoter. We used deletion mapping and complementation analysis to identify one responsible gene as CATALASE2. Our results thus indicate that ROS-producing cellular metabolism links to OPDA signaling.

• 出版日期2014-8