NAC transcription factor TgNAP promotes tulip petal senescence

• DOI: 10.1093/plphys/kiac351
• Publication Date: 2022-07-28T13:34:44Z
• Authors: Lin Meng; Haipo Yang; Lin Xiang; Yanping Wang; Zhulong Chan
• Keywords: Petal; Senescence; Phenylalanine ammonia-lyase

Abstract Petal senescence is a crucial determinant for ornamental quality and economic value of floral crops. Salicylic acid (SA) reactive oxygen species (ROS) are two prominent factors involved in plant regulation. In this study, tulip TgNAP (NAC-like, activated by APETALA3/PISTILLATA) was characterized as positively regulating petal through dually SA biosynthesis ROS detoxification pathways. upregulated senescing petals while exogenous H2O2 treatments substantially promoted tulip. Silencing VIGS assay delayed H2O2-induced tulip, whereas overexpression the process Arabidopsis (Arabidopsis thaliana) plants. Additionally, inhibition prolonged lifespan TgNAP-silenced discs. Further evidence indicated that activates transcriptions key biosynthetic genes ISOCHORISMATE SYNTHASE 1 (TgICS1) PHENYLALANINE AMMONIA-LYASE (TgPAL1) directly binding to their promoter regions. Meanwhile, repressed scavenging inhibiting PEROXIDASE 12 (POD12) POD17 expression. Taken together, these results indicate enhances accumulation regulate