Key Laboratory of Plant Biotechnology in Universities of Shandong

Qingdao, China

Key Laboratory of Plant Biotechnology in Universities of Shandong

Qingdao, China
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Wang G.,Key Laboratory of Plant Biotechnology in Universities of Shandong | Xiao Q.,Key Laboratory of Plant Biotechnology in Universities of Shandong | Yi Y.-J.,Key Laboratory of Plant Biotechnology in Universities of Shandong | Yang H.-B.,Key Laboratory of Plant Biotechnology in Universities of Shandong | And 2 more authors.
Zhiwu Shengli Xuebao/Plant Physiology Journal | Year: 2014

The sweet potato (Ipomoea batatas Lam.) variety 'Xushu 22' was used in this study. The effects of different concentration of NaCl on seedling root growth, leaf antioxidant capacity, osmotic adjustment substance content, photosynthetic gas exchange parameters, fluorescence parameters, ion content of leaves, and the alleviatory effect of different concentrations of Ca2+ on 300 mmol·L-1NaCl stress were analyzed. The results showed that the seedling root growth, the relative conductivity and MDA content of leaves were less affected under low concentrations (50 and 100 mmol·L-1) of NaCl. With the increasing of salinity, the superoxide dismutase (SOD) activity was increased firstly and decreased thereafter, the proline and soluble sugar contents increased, the Pn, Tr, Gs, Fv/Fm, RC/CS0, TR0/CS0, ET0/CS0 and ΣE0 of leaves decreased, while the ΣD0 of leaves increased. The leaf Na+content was increased, but the K+, Ca2+ and K+/Na+ decreased. Under high concentration (300 mmol·L-1) of NaCl, the sweet potato seedling motebolism was significantly inhibited. Interestingly, it was found that application of appropriate exogenous Ca2+ could significantly abate the poison of NaCl stress in sweet potato seedlings, and 12 mmol·L-1Ca2+ had the best abating effect, which significantly promoted the root growth, osmoregulation ability of sweet potato seedlings, reduced the membrane lipid oxidation, and kept higher values of Fv/Fm, RC/CS0, TR0/CS0, ET0/CS0, ΣE00 but lower ΣE00 in sweet potato leaves under salt stress. In turn, photosynthesis and transpiration were improved. These observations suggested that the application of exogenous Ca2+ was an effective method to improve the salt tolerance of sweet potato.


Yang H.-B.,Key Laboratory of Plant Biotechnology in Universities of Shandong | Sun P.,Qingdao Agricultural University
Zhiwu Shengli Xuebao/Plant Physiology Journal | Year: 2012

Buckwheat (Fagopyrum esculentum) seedlings of salt sensitive variety 'TQ-0808' were treated as materials. Through the treatment of 100 mmol·L-1 NaCl and adding different concentrations of salicylic acid (SA) and jasmonic acid (JA) to determine physiological indexes of salt tolerance and to make sure the effects of exogenous SA and JA on physiological traits of salt tolerance in buckwheat. The results showed that the exogenous SA and JA could significantly reduce the plasmalemma permeability and malondialdehyde (MDA) content of buckwheat leaves under salt stress, and the exogenous SA reduced slightly more than the exogenous JA did. The optimal concentration of exogenous SA was 0.6 mmol·L-1. The exogenous SA and JA could significantly increase the activities of superoxide dismutase (SOD) and ascorbate peroxidase (APX) and the net photosynthetic rate of buckwheat leaves under salt stress, and the exogenous JA increased significantly greater than the exogenous SA did. The optimal concentration of exogenous JA was 40 μmol·L-1. Exogenous SA and JA could significantly improve the physiological characteristics of buckwheat and had better mitigation under salt stress. It indicates that improving salt tolerance of buckwheat is feasible through the appropriate concentration treatment of exogenous SA and JA.

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