期刊
JOURNAL OF PLANT GROWTH REGULATION
卷 35, 期 2, 页码 330-344出版社
SPRINGER
DOI: 10.1007/s00344-015-9536-3
关键词
Diethyl aminoethyl hexanoate; Salinity stress; Seed germination; Cassia obtusifolia L.
资金
- National Natural Science Foundation of China [31300222, 81302744]
- Natural Science Foundation of Jiangsu Province [BK20130214]
- Natural Science Foundation of the Colleges and Universities in Jiangsu Province [13KJB180025]
- Natural Science Foundation Project of CQ CSTC [cstc2013jcyjA50012]
- Scientific and Technological Research Program of Chongqing Municipal Education Commission [KJ130820]
- New Teacher Foundation of Chongqing University of Technology [2012ZD24]
The purpose of the present study was to investigate the mechanism of DA-6 in alleviating the salinity inhibition of Cassia obtusifolia L. seeds and seedlings. NaCl (100 mM) was used to mimic salinity stress in a series of experiments. Varying combinations of DA-6 were added to seeds and seedlings under salinity stress. Seed germination indices and seedling parameters were investigated. Seed germination and seedling growth were significantly inhibited under salinity stress. NaCl-induced inhibitory effects on seed germination and seedling growth were ameliorated by DA-6 with different concentrations. Addition of DA-6 to seeds (50 A mu M) and seedlings (100 A mu M) significantly alleviated damage to the plant cells under salinity stress. DA-6 (regardless of the presence or absence of NaCl) enhanced chlorophyll concentration, total soluble sugars, free proline, and soluble protein, and improved photosystem II (PSII) photochemical efficiency levels (F (v)/F (m)), PSII actual photochemical efficiency (I broken vertical bar PSII), and the photochemical quench coefficient. In contrast, the initial fluorescence (F (o)) and the non-photochemical quenching coefficient decreased. Application of DA-6 also enhanced the activities of superoxide dismutase (SOD; EC 1.15.1.1), peroxidase (POD; EC 1.11.1.7), catalase (CAT; EC 1.11.1.6), ascorbate peroxidase (APX; EC 1.11.1.11), and glutathione reductase (GR; EC 1.6.4.2), thus alleviating oxidative damage, as indicated by decreases in thiobarbituric acid-reactive substances, hydrogen peroxide concentration (H2O2), relative conductivity, and lipoxygenase activity (LOX; EC 1.13.11.12). Based on the experimental results, we conclude that DA-6 induces advantageous effects on the attenuation of salt-stress inhibition of C. obtusifolia seeds and seedlings and alleviates oxidative damage by conferring beneficial cytoprotection and activating antioxidant enzymes. DA-6 can be used as an effective plant growth regulator to alleviate salinity stress.
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