NDLI: Endogenous Salicylic Acid Levels and Signaling Positively Regulate Arabidopsis Response to Polyethylene Glycol-Simulated Drought Stress

Content Provider	Springer Nature Link
Author	He, Qingqing Zhao, Shiyang Ma, Qunfei Zhang, Yiyan Huang, Linli Li, Guangzhe Hao, Lin
Copyright Year	2014
Abstract	Salicylic acid (SA) functions in the plant response to drought stress were assessed using SA-altering Arabidopsis mutants, including snc1 (with constitutively high levels of SA) and its nahG-transformed plants (named as snc1/nahG, with a comparable SA level to the wild type), sid2 and transgenic line nahG (both with SA deficiency), and npr1-1 (with SA signaling blockage). The drought stress was simulated by polyethylene glycol (PEG)-6000 treatment. Compared with wild-type (wt) plants, the snc1 plants displayed obvious easing of PEG-induced growth inhibition, leaf water loss, and photosynthesis-related impairment, whereas in nahG, sid2, and npr1-1 mutants the effect was more severe. PEG stress reduced stomatal conductance, to a higher extent in the snc1 line, whereas it was lower in nahG, sid2, and npr1-1 lines as compared with the wt. The snc1 plants accumulated higher levels of H2O2 than the other genotypes tested. PEG stress increased activities of superoxide dismutase and peroxidase, but decreased activities of catalase in all lines tested, to a greater extent in snc1 and less in sid2, nahG, and npr1-1 relative to wt. Proline was significantly increased, especially in snc1 line at 6 % and higher PEG stress. Noticeably, the performance of snc1 under PEG stress was dependent on SA levels, as the expression of nahG in snc1 plants did not only significantly reduce SA levels, but largely reversed the above-mentioned parameters, as well as eliminated the drought tolerance. Based on these data, it was concluded that endogenous SA levels and signaling provided a protective role in the Arabidopsis response to PEG-simulated drought.
Starting Page	871
Ending Page	880
Page Count	10
File Format	PDF
ISSN	07217595
Journal	Journal of Plant Growth Regulation
Volume Number	33
Issue Number	4
e-ISSN	14358107
Language	English
Publisher	Springer US
Publisher Date	2014-06-21
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arabidopsis thaliana Salicylic acid Polyethylene glycol Drought Relative water content Stomata Plant Sciences Plant Anatomy/Development Plant Physiology Agriculture
Content Type	Text
Resource Type	Article
Subject	Plant Science Agronomy and Crop Science

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