Effect of Bio-fabricated Selenium Nanoparticles in Morphological Growth Parameters of Rice (Oryza sativa L.) Seedlings at Early Growth Stage

The present study highlights the effect of Bio-fabricated Selenium Nanoparticles in Morphological Growth Parameters of Rice (Oryza sativa L.) Seedlings at Early Growth Stage. On plant growth, selenium (Se) exhibits both positive and negative effects. Lower sodium selenite concentrations promoted the growth of rice (Oryza sativa L.) seedlings, while greater sodium selenite concentrations inhibited seedling growth. Physiological studies indicated that Se (sodium selenite) at a concentration between 2 and 6mg/L can promote rice seedling growth; however higher concentration (>6mg/L) became inhibitory. Se treatments activated antioxidative system to enhance stress resistance in plants. Besides, proteins involved in photosynthesis in shoot, as well as carbohydrate and protein metabolism in root were up-regulated under lower Se treatment. When taken as a whole, these facts support the growth of seedlings. Higher Se treatment, however, may result in the production of excessive reactive oxygen species (ROS) and selenoproteins, which suppress photosynthesis and primary metabolism and impede seedling growth. In order to analyze the Se response pathways in higher plants and create Se-enriched rice cultivars in the future, our study offered new insights into the Se response in rice at the morphological level.