Yuzhan Li1, Luxin Liang1, Wu Li2, Umair Ashraf3, Lin Ma1, Xiangru Tang4,5, Shenggang Pan1,6, Hua Tian1,6, Zhaowen Mo7,8. 1. State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Agriculture, South China Agricultural University, 510642, Guangzhou, China. 2. Crop Research Institute, Guangdong Academy of Agricultural Sciences, Guangdong Provincial Key Laboratory of Crop Genetic Improvement, Guangdong, 510640, Guangzhou, China. 3. Department of Botany, Division of Science and Technology, University of Education, 54770, Lahore, Punjab, Pakistan. 4. State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Agriculture, South China Agricultural University, 510642, Guangzhou, China. tangxr@sacu.edu.cn. 5. Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture and Rural Affairs, 510642, Guangzhou, China. tangxr@sacu.edu.cn. 6. Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture and Rural Affairs, 510642, Guangzhou, China. 7. State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Agriculture, South China Agricultural University, 510642, Guangzhou, China. scaumozhw@126.com. 8. Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture and Rural Affairs, 510642, Guangzhou, China. scaumozhw@126.com.
Abstract
BACKGROUND: Cadmium (Cd) is amongst the most toxic heavy metals that severely affects crop growth, whereas application of nanoparticles (NPs) to negate the toxic effects of heavy metals could be an effective management approach. In the present study, the seeds of two fragrant rice varieties i.e., Yuxiangyouzhan and Xiangyaxiangzhan under normal and Cd stress conditions i.e., 0 and 100 mg L- 1 applied with four levels of ZnO NPs i.e., 0, 25, 50, and 100 mg L- 1. RESULTS: Seed priming with ZnO NPs had no significant effect on the seed germination (p > 0.05) however, it substantially improved the seedling growth and other related physiological attributes under the Cd stress. The mean fresh weight of the shoot, and whole seedling was increased by 16.92-27.88% and by 16.92-27.88% after ZnO NPs application. The root fresh weight, root-shoot length was also substantially improved under ZnO NPs treatment. Moreover, application of ZnO NPs induced modulations in physiological and biochemical attributes e.g., the superoxide dismutase (SOD) activity in root and shoot, the peroxidase (POD) activity and metallothionein contents in root were increased under low levels of ZnO NPs. The α-amylase and total amylase activity were improved by ZnO NPs application under Cd Stress. Besides, modulation in Zn concentration and ZnO NPs uptake in the seedling were detected. The metabolomic analysis indicated that various pathways such as alanine, aspartate and glutamate metabolism, phenylpropanoid biosynthesis, and taurine and hypotaurine metabolism were possibly important for rice response to ZnO NPs and Cd. CONCLUSION: Overall, application of ZnO NPs substantially improved the early growth and related physio-biochemical attributes in rice. Our findings provide new insights regarding the effects of ZnO NPs on seed germination, and early growth of rice, and its potential applications in developing crop resilience against Cd contaminated soils.
BACKGROUND:Cadmium (Cd) is amongst the most toxic heavy metals that severely affects crop growth, whereas application of nanoparticles (NPs) to negate the toxic effects of heavy metals could be an effective management approach. In the present study, the seeds of two fragrant rice varieties i.e., Yuxiangyouzhan and Xiangyaxiangzhan under normal andCdstress conditions i.e., 0 and 100 mg L- 1 applied with four levels of ZnO NPs i.e., 0, 25, 50, and 100 mg L- 1. RESULTS: Seed priming with ZnO NPs had no significant effect on the seed germination (p > 0.05) however, it substantially improved the seedling growth and other related physiological attributes under the Cdstress. The mean fresh weight of the shoot, and whole seedling was increased by 16.92-27.88% and by 16.92-27.88% after ZnO NPs application. The root fresh weight, root-shoot length was also substantially improved under ZnO NPs treatment. Moreover, application of ZnO NPs induced modulations in physiological and biochemical attributes e.g., the superoxide dismutase (SOD) activity in root and shoot, the peroxidase (POD) activity and metallothionein contents in root were increased under low levels of ZnO NPs. The α-amylase and total amylase activity were improved by ZnO NPs application under CdStress. Besides, modulation in Zn concentration andZnO NPs uptake in the seedling were detected. The metabolomic analysis indicated that various pathways such asalanine, aspartateandglutamate metabolism, phenylpropanoid biosynthesis, andtaurineandhypotaurine metabolism were possibly important for rice response to ZnO NPsandCd. CONCLUSION: Overall, application of ZnO NPs substantially improved the early growth and related physio-biochemical attributes in rice. Our findings provide new insights regarding the effects of ZnO NPs on seed germination, and early growth of rice, and its potential applications in developing crop resilience against Cd contaminated soils.
Authors: Michael G Palmgren; Stephan Clemens; Lorraine E Williams; Ute Krämer; Søren Borg; Jan K Schjørring; Dale Sanders Journal: Trends Plant Sci Date: 2008-08-11 Impact factor: 18.313
Authors: Rubina Khanam; Anjani Kumar; A K Nayak; Md Shahid; Rahul Tripathi; S Vijayakumar; Debarati Bhaduri; Upendra Kumar; Sangita Mohanty; P Panneerselvam; Dibyendu Chatterjee; B S Satapathy; H Pathak Journal: Sci Total Environ Date: 2019-09-07 Impact factor: 7.963