Nanotechnology has greatly expanded the applications of nanoparticles(NPs)domain in the scientific field.In this context,the zinc oxide nanoparticles(ZnO-NPs)and 24-epibrassinolide(EBL)has been revealed to positively ...Nanotechnology has greatly expanded the applications of nanoparticles(NPs)domain in the scientific field.In this context,the zinc oxide nanoparticles(ZnO-NPs)and 24-epibrassinolide(EBL)has been revealed to positively regulate plant metabolism and growth.In the present study,we investigated the role of ZnO-NPs and EBL in the regulation of plant growth,photosynthetic efficiency,enzymes activities and fruit yield in tomato.Foliar treatment of ZnO-NPs at three levels(10,50 or 100 ppm)and EBL(10^(−8) M)were applied separately or in combination to the foliage of plant at 35-39 days after sowing(DAS);and the control plants were treated with double distilled water(DDW)only at the same time interval.Among different tested concentrations of ZnO-NPs and/or EBL,the combined spray of 50 ppm of ZnO-NPs and 10^(−8) M of EBL proved to be best,and considerably increased the growth,photosynthetic efficiency,biochemical enzymes activities as well as fruit yield.Besides,the performance of the antioxidant enzymes viz catalase,peroxidase and superoxide dismutase were also increased after the combined application of ZnO-NPs and EBL in Lycopersicon esculentum.Therefore,it is suggested that combined application of 50 ppm of ZnO-NPs and 10−8 M of EBL is the best combination can be applied to increase the performance and yield of L.esculentum.展开更多
Seeds of Indian mustard （Brassicajuncea （L.） Czern. et Coss.） were exposed to 0, 50, 100 and 150 mmol/L NaCI for 8 h and seeds were sown in an earthen pot. These stressed seedlings were subsequently sprayed with 1...Seeds of Indian mustard （Brassicajuncea （L.） Czern. et Coss.） were exposed to 0, 50, 100 and 150 mmol/L NaCI for 8 h and seeds were sown in an earthen pot. These stressed seedlings were subsequently sprayed with 10μmol/L salicylic acid （SA） at 30 d and were sampled at 60 d to assess the changes in growth, photosynthesis and antioxidant enzymes. The seedlings raised from the seeds treated with NaCI had significantly reduced growth and the activities of carbonic anhydrase, nitrate reductase and photosynthesis, and the decrease was proportional to the increase in NaCI concentration. However, the antioxidant enzymes （catalase, peroxidase and superoxide dismutase） and proline content was enhanced in response to NaCI and/or SA treatment, where their interaction had an additive effect. Moreover, the toxic effects generated by the lower concentration of NaCI （50 mmol/L） were completely overcome by the application of SA. It was, therefore, concluded that SA ameliorated the stress generated by NaCl through the alleviated antioxidant system.展开更多
基金supported by National Natural Science Foundation of China(3197140894)A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.
文摘Nanotechnology has greatly expanded the applications of nanoparticles(NPs)domain in the scientific field.In this context,the zinc oxide nanoparticles(ZnO-NPs)and 24-epibrassinolide(EBL)has been revealed to positively regulate plant metabolism and growth.In the present study,we investigated the role of ZnO-NPs and EBL in the regulation of plant growth,photosynthetic efficiency,enzymes activities and fruit yield in tomato.Foliar treatment of ZnO-NPs at three levels(10,50 or 100 ppm)and EBL(10^(−8) M)were applied separately or in combination to the foliage of plant at 35-39 days after sowing(DAS);and the control plants were treated with double distilled water(DDW)only at the same time interval.Among different tested concentrations of ZnO-NPs and/or EBL,the combined spray of 50 ppm of ZnO-NPs and 10^(−8) M of EBL proved to be best,and considerably increased the growth,photosynthetic efficiency,biochemical enzymes activities as well as fruit yield.Besides,the performance of the antioxidant enzymes viz catalase,peroxidase and superoxide dismutase were also increased after the combined application of ZnO-NPs and EBL in Lycopersicon esculentum.Therefore,it is suggested that combined application of 50 ppm of ZnO-NPs and 10−8 M of EBL is the best combination can be applied to increase the performance and yield of L.esculentum.
文摘Seeds of Indian mustard （Brassicajuncea （L.） Czern. et Coss.） were exposed to 0, 50, 100 and 150 mmol/L NaCI for 8 h and seeds were sown in an earthen pot. These stressed seedlings were subsequently sprayed with 10μmol/L salicylic acid （SA） at 30 d and were sampled at 60 d to assess the changes in growth, photosynthesis and antioxidant enzymes. The seedlings raised from the seeds treated with NaCI had significantly reduced growth and the activities of carbonic anhydrase, nitrate reductase and photosynthesis, and the decrease was proportional to the increase in NaCI concentration. However, the antioxidant enzymes （catalase, peroxidase and superoxide dismutase） and proline content was enhanced in response to NaCI and/or SA treatment, where their interaction had an additive effect. Moreover, the toxic effects generated by the lower concentration of NaCI （50 mmol/L） were completely overcome by the application of SA. It was, therefore, concluded that SA ameliorated the stress generated by NaCl through the alleviated antioxidant system.
