[Objective] In order to study the effects of brassinosteroid on salinity toler- ance of cotton. [Method] Three application modes （leaf application, root application and leaf/root application） of brassinosteroid for ...[Objective] In order to study the effects of brassinosteroid on salinity toler- ance of cotton. [Method] Three application modes （leaf application, root application and leaf/root application） of brassinosteroid for cotton under NaCI stress were de- signed to understand the effects of brassinosteroid on Na＋ and CI- accumulation, osmotic adjustment substance （proline） and biomass accumulation of cotton under NaCI stress. [Result] NaCI inhibited the growth of cotton seedlings. Compared with the control group, the biomass of cotton seedlings was decreased, Na＋ and CI- contents, MDA content and proline content were increased in cotton under NaCI stress. Under the NaCI stress, three application modes of brassinosteroid significant- ly improved the biomass, chlorophyll content in leaves, root activity and proline content; while Na~ and CI- content, MDA content were decreased. The enhancement of root activity and root physiological functions were more marked in root application and leaf/root application treatments than in leaf/root application treatment. [Conclu- sion] Three application modes of brassinosteroid all could alleviate the NaCI injuries on cotton, but root application and root/leaf application modes of brassinosteroid for cotton under NaCI stress are superior to the leaf application.展开更多
[Objective] This study was conducted to reveal the effect of exogenous calcium （Ca） in mitigating the damage caused by NaCI stress to watermelon seedlings. [Method] To the liquid medium containing 100 mmol/L NaCI, C...[Objective] This study was conducted to reveal the effect of exogenous calcium （Ca） in mitigating the damage caused by NaCI stress to watermelon seedlings. [Method] To the liquid medium containing 100 mmol/L NaCI, CaSO4 was added to the final concentrations of 4, 6, 10 and 14 mmol/L. The morphological and physiological indices including plant height, stem diameter, number of leaves per plant, maximum leaf length, maximum leaf width, seedling fresh weight and dry weight, malondialdehyde （MDA） content, relative permeability of plasma membrane, ascorbic acid （AsA） content, free proline content, soluble sugar content and soluble protein content in leaves of the seedlings treated with above media for 10 d were measured. [Result] NaCI stress significantly inhibited the growth of watermelon seedlings. The membrane permeability and MDA content in leaves were significantly increased under NaCI stress, and the contents of proline, soluble sugar, soluble protein and AsA were increased to different extents. Exogenous CaSO4 influenced the morphological and physiological indices of seedlings under NaCI stress in a manner. Treated with 6 mmol/L CaSO4, the growth of seedlings under salinity was significantly improved; membrane permeability and MDA content were drastically reduced, the contents of proline, soluble sugar, soluble pro- tein and AsA in leaves were significantly increased. [Conclusion] Exogenous CaSO＋ alleviates lipid peroxidation and inhibition of seedling growth under NaCI stress by improving the abilities of antioxidation and osmotic adjustment, and 6 mmol/L CaSO4 showed the best effect.展开更多
The effects of different concentrations of NaCl stresses on seed germina- tion and seedling growth of Canavium album （Lour.） Raeuseh. were investigated. In addition, the amylase activity was measured. The results sh...The effects of different concentrations of NaCl stresses on seed germina- tion and seedling growth of Canavium album （Lour.） Raeuseh. were investigated. In addition, the amylase activity was measured. The results showed that the four Canavium album Raeuseh cultivars were sensitive to NaCI stress in varying de- grees. When the NaCI concentration was less than 0.8%, the seed germination rates of the four Canavium album Raeuseh cultivars were all higher than 90%. However, with the increased NaCI concentration, the water intake by seed germina- tion was inhibited, the amylase activity was decreased, and the germination rate, germination index and vigor index were all trended to be decreased, which differed among the four test cultivars. When the NaCl concentration was less than 0.4%, the seedling growths of the four Canavium album Raeuseh cultivars were not af- fected. But when the NaCI concentration was increased, the critical salinities inhibit- ing radicle growth were different among the four cultivars （Huiyuan, 1.0%; Chayao No.1, 1.2%; Sanfang, 1.4%; Frantoio, 1.6%）. Among the four test cuttivars, the sen- sitivities to NaCl stress ranked as Huiyuan 〉 Chayao No.1 〉 Sanfang 〉 Frantoio.展开更多
基金Supported by National Science Foundation of China(31201139)National R&D Project of Transgenic Crops of Ministry of Science and Technology of China(2011ZX08005001)Fund for Independent Innovation of Agricultural Sciences in Jiangsu Province(CX(14)2065)~~
文摘[Objective] In order to study the effects of brassinosteroid on salinity toler- ance of cotton. [Method] Three application modes （leaf application, root application and leaf/root application） of brassinosteroid for cotton under NaCI stress were de- signed to understand the effects of brassinosteroid on Na＋ and CI- accumulation, osmotic adjustment substance （proline） and biomass accumulation of cotton under NaCI stress. [Result] NaCI inhibited the growth of cotton seedlings. Compared with the control group, the biomass of cotton seedlings was decreased, Na＋ and CI- contents, MDA content and proline content were increased in cotton under NaCI stress. Under the NaCI stress, three application modes of brassinosteroid significant- ly improved the biomass, chlorophyll content in leaves, root activity and proline content; while Na~ and CI- content, MDA content were decreased. The enhancement of root activity and root physiological functions were more marked in root application and leaf/root application treatments than in leaf/root application treatment. [Conclu- sion] Three application modes of brassinosteroid all could alleviate the NaCI injuries on cotton, but root application and root/leaf application modes of brassinosteroid for cotton under NaCI stress are superior to the leaf application.
基金Supported by Agricultral Science and Technology Development Program of Shanxi Pvince(20150311010-1)Agricultral Science and Technology Development Program of Datong City(201468-2,2015099)~~
文摘[Objective] This study was conducted to reveal the effect of exogenous calcium （Ca） in mitigating the damage caused by NaCI stress to watermelon seedlings. [Method] To the liquid medium containing 100 mmol/L NaCI, CaSO4 was added to the final concentrations of 4, 6, 10 and 14 mmol/L. The morphological and physiological indices including plant height, stem diameter, number of leaves per plant, maximum leaf length, maximum leaf width, seedling fresh weight and dry weight, malondialdehyde （MDA） content, relative permeability of plasma membrane, ascorbic acid （AsA） content, free proline content, soluble sugar content and soluble protein content in leaves of the seedlings treated with above media for 10 d were measured. [Result] NaCI stress significantly inhibited the growth of watermelon seedlings. The membrane permeability and MDA content in leaves were significantly increased under NaCI stress, and the contents of proline, soluble sugar, soluble protein and AsA were increased to different extents. Exogenous CaSO4 influenced the morphological and physiological indices of seedlings under NaCI stress in a manner. Treated with 6 mmol/L CaSO4, the growth of seedlings under salinity was significantly improved; membrane permeability and MDA content were drastically reduced, the contents of proline, soluble sugar, soluble pro- tein and AsA in leaves were significantly increased. [Conclusion] Exogenous CaSO＋ alleviates lipid peroxidation and inhibition of seedling growth under NaCI stress by improving the abilities of antioxidation and osmotic adjustment, and 6 mmol/L CaSO4 showed the best effect.
基金Supported by Major New Product Development Project of Department of Science and Technology of Yunnan Province(2013-2016,1601006030)~~
文摘The effects of different concentrations of NaCl stresses on seed germina- tion and seedling growth of Canavium album （Lour.） Raeuseh. were investigated. In addition, the amylase activity was measured. The results showed that the four Canavium album Raeuseh cultivars were sensitive to NaCI stress in varying de- grees. When the NaCI concentration was less than 0.8%, the seed germination rates of the four Canavium album Raeuseh cultivars were all higher than 90%. However, with the increased NaCI concentration, the water intake by seed germina- tion was inhibited, the amylase activity was decreased, and the germination rate, germination index and vigor index were all trended to be decreased, which differed among the four test cultivars. When the NaCl concentration was less than 0.4%, the seedling growths of the four Canavium album Raeuseh cultivars were not af- fected. But when the NaCI concentration was increased, the critical salinities inhibit- ing radicle growth were different among the four cultivars （Huiyuan, 1.0%; Chayao No.1, 1.2%; Sanfang, 1.4%; Frantoio, 1.6%）. Among the four test cuttivars, the sen- sitivities to NaCl stress ranked as Huiyuan 〉 Chayao No.1 〉 Sanfang 〉 Frantoio.
