Salt-inducible expression of OsJAZ8 improves resilience against salt-stress

• Published in: BMC plant biology Vol. 18; no. 1; pp. 311 - 15
• Main Authors: Peethambaran, Preshobha K, Glenz, René, Höninger, Sabrina, Shahinul Islam, S M, Hummel, Sabine, Harter, Klaus, Kolukisaoglu, Üner, Meynard, Donaldo, Guiderdoni, Emmanuel, Nick, Peter, Riemann, Michael
• Format: Journal Article
• Language: English
• Published: England BioMed Central Ltd 29.11.2018; BioMed Central; BMC
• Subjects: Abiotic stress; Adaptation; Agricultural productivity; BY-2 cells; Cell division; Cereal crops; Co-Repressor Proteins - genetics; Co-Repressor Proteins - metabolism; Co-Repressor Proteins - physiology; Cyclopentanes - metabolism; Enzymes; Gene expression; Gene Expression Regulation, Plant - drug effects; Genetic aspects; Genomics; Jasmonate; Life Sciences; MeJA; Methyl jasmonate; Nicotiana - genetics; Oryza - genetics; Oryza - metabolism; Oryza sativa japonica; OsJAZ8; Oxylipins - metabolism; Planning; Plant Growth Regulators - metabolism; Plant Proteins - genetics; Plant Proteins - metabolism; Plant Proteins - physiology; Plants, Genetically Modified - genetics; Proteins; Rice; Salinity; Salt Stress; Salt tolerance; Salt-Tolerant Plants - genetics; Salt-Tolerant Plants - metabolism; Seedlings; Side effects; Signal Transduction; Signaling; Stress; Transcription factors; Transgenic plants; Vegetal Biology; Auxin; Jasmonate; MeJA; BY-2 cells; ZOS3–11; OsJAZ8; Rice; Salinity; ZOS3-11
• ISSN: 1471-2229; 1471-2229
• DOI: 10.1186/s12870-018-1521-0

Productivity of important crop rice is greatly affected by salinity. The plant hormone jasmonate plays a vital role in salt stress adaptation, but also evokes detrimental side effects if not timely shut down again. As novel strategy to avoid such side effects, OsJAZ8, a negative regulator of jasmonate signalling, is expressed under control of the salt-inducible promoter of the transcription factor ZOS3-11, to obtain a transient jasmonate signature in response to salt stress. To modulate the time course of jasmonate signalling, either a full-length or a dominant negative C-terminally truncated version of OsJAZ8 driven by the ZOS3-11 promoter were expressed in a stable manner either in tobacco BY-2 cells, or in japonica rice. The transgenic tobacco cells showed reduced mortality and efficient cycling under salt stress adaptation. This was accompanied by reduced sensitivity to Methyl jasmonate and increased responsiveness to auxin. In the case of transgenic rice, the steady-state levels of OsJAZ8 transcripts were more efficiently induced under salt stress compared to the wild type, this induction was more pronounced in the dominant-negative OsJAZ8 variant. The result concluded that, more efficient activation of OsJAZ8 was accompanied by improved salt tolerance of the transgenic seedlings and demonstrates the impact of temporal signatures of jasmonate signalling for stress tolerance.