Peethambaran PK, Glenz R, Höninger S, Shahinul Islam SM, Hummel S, Harter K, Kolukisaoglu Ü, Meynard D, Guiderdoni E, Nick P, Riemann M.
BMC Plant Biol. 2018 Nov 29;18(1):311. doi: 10.1186/s12870-018-1521-0.
Abstract
BACKGROUND:
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.
RESULTS:
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.
CONCLUSIONS:
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.
See: https://www.ncbi.nlm.nih.gov/pubmed/30497415
Figure 1: Localization of ZOS3–11 and ZOS3–12 in cells of rice coleoptile. GFP (left) and the fusion constructs ZOS3–11-GFP (centre) and ZOS3–12-GFP (right) were transiently expressed under the control of the CaMV 35S promoter. Shown are DIC (top) and fluorescence images (bottom) of each transformed cell 12–20 h after the biolistic transformation (scale bar represents 50 μm). The position of the nucleus is shown by an arrow. Three biological replicates were tested for each line.
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