Identification of OsMYC2-regulated senescence-associated genes in rice

• Published in: Planta Vol. 245; no. 6; pp. 1241 - 1246
• Main Authors: Uji, Yuya, Akimitsu, Kazuya, Gomi, Kenji
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Science + Business Media 01.06.2017; Springer Berlin Heidelberg; Springer Nature B.V
• Subjects: Agriculture; Biomedical and Life Sciences; Chlorophyll; Cyclopentanes - metabolism; Ecology; Forestry; Gene expression; Gene Expression Regulation, Plant; Gene regulation; Genes; Jasmonic acid; Leaves; Life Sciences; Oryza - genetics; Oryza - metabolism; Oxylipins - metabolism; Plant Leaves - genetics; Plant Leaves - metabolism; Plant Proteins - genetics; Plant Proteins - metabolism; Plant Sciences; Plants, Genetically Modified - genetics; Plants, Genetically Modified - metabolism; Promoters; Rice; Senescence; SHORT COMMUNICATION; Signal transduction; Transcription factors; Transcription Factors - genetics; Transcription Factors - metabolism; OsMYC2; Leaf senescence; Transcription factor; Jasmonic acid; Rice; Senescence-associated gene
• ISSN: 0032-0935; 1432-2048
• DOI: 10.1007/s00425-017-2697-5

OsMYC2, a transcription factor (TF), acts as a positive regulator of jasmonic acid (JA) signaling involved in development and defense in rice. Here, we report that OsMYC2 plays an important role in leaf senescence under dark-induced senescence (DIS) conditions. Overexpression of OsMYC2 significantly promoted leaf senescence, indicated by reduction of chlorophyll content under DIS conditions in rice. Leaf senescence under the DIS conditions was negatively regulated by OsJAZ8, a rice jasmonate ZIM-domain protein involved in the JA signaling pathway. OsMYC2 upregulated the expression of some senescence-associated genes (SAGs) and selectively bound to the G-box/G-box-like motifs in the promoters of some SAGs in vivo. These results suggest that OsMYC2 acts as a positive regulator of leaf senescence by direct-or indirectregulation of SAGs in rice.