| 作 者 |
Hongmei Zhai（翟红梅）, Baodi Dong（董宝娣）,Yunzhou Qiao（乔云周），Changhai Shi（师长海）,Jing Yang,Dongxiu Li,Yueyan Liu,Tianwei Zhang,Mengyu Liu（刘孟雨）; |
| 论文摘要 |
In order to diminish environmental stresses of saline water, it is essential to increase soil porosity. One pot experiment with three levels of water salinity (3, 35 and 85 mM NaCl) and two levels of oxygen concentration (Control: about 3.0 mg.L-1; Aeration: 7.0-9.0 mg.L-1) in water was conducted on tomato plants. The results showed that with increased water salinity, plant height, leaf area, biomass and fruit yield were reduced. However, aeration could minimize the impact of salinity, especially at 85 mM water salinity. Leaf water potential was higher under aeration treatment compared to the control. The rates of photosynthesis (Pn) and transpiration (Tr) were elevated by 2.33 mu mol.m(-2).s(-1) and 0.69 mmol.m(-2).s(-1), respectively, under aeration at 85 mM water salinity, while transpiration efficiency (the ratio of Pn/Tr) was increased by 51.2%. Aeration improved the absorption of K+ and increased the ratio of K+/Na+ in the leaf. At 35 mM and 85 mM salinity levels under aeration, the activity of superoxide dismutase in the leaf was up-regulated by 40.8% and 19.2%, the activity of catalase was increased by 38.3% and 61.2%, while the malondialdehyde concentration was reduced by 15.2% and 17.7%, and the electrolyte leakage ratio decreased by 8.9% and 14.7%, respectively. Based on these results, it was concluded that under aeration, the water status and membrane integrity of the plant was improved, with higher antioxidant enzyme activities and greater K+ absorption, which led to a higher salt tolerance, higher Pn and more efficient use of water by the plant. |
