Abstract
Lycopene ε-cyclase (ε-LCY) functions at a branch point of the carotenoid biosynthesis pathway and modulates the ratio of lutein to the β-carotenoids. RNA interference (RNAi) and overexpression (OE) of Ntε-LCY were used to evaluate the physiological roles of ε-LCY in Nicotiana tobacum. In leaves, strong accumulation of β-branch carotenoids and high expression of carotenoid biosynthesis genes resulted from suppression of Ntε-LCY expression. RNAi plants showed enhanced salt and drought tolerance, while overexpression of the Ntε-LCY gene weakened tolerance to salt and drought stress, as compared to control. Further analysis revealed that RNAi plants exhibited less water loss and had lower reactive oxygen species levels than did WT plants after both the salt and drought treatments. Further, higher levels of ABA accumulated in the RNAi lines than in the WT lines under stress conditions. These results suggest that reduced Ntε-LCY expression can improve drought and salinity tolerance in Nicotiana tabacum by enhancing their ROS scavenging ability.
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Acknowledgments
This work was supported by the Science Project of the Zhengzhou Tobacco Research Institute (902013CZ0620). We also thank Dr. John Hugh Snyder for his kind help in revising the manuscript.
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Communicated by R. Wang.
Y. Shi, P. Liu, Y. Xia, P. Wei contributed equally to this work.
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Shi, Y., Liu, P., Xia, Y. et al. Downregulation of the lycopene ε-cyclase gene confers tolerance to salt and drought stress in Nicotiana tabacum . Acta Physiol Plant 37, 210 (2015). https://doi.org/10.1007/s11738-015-1958-9
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DOI: https://doi.org/10.1007/s11738-015-1958-9