Stimulatory Effect of Fe3O4 Nanoparticles on the Growth and Yield of Pseudostellaria heterophylla via Improved Photosynthetic Performance

Nanomaterials have recently been used as growth stimulants to promote the production of crops in saline-alkali through root application. However, if applied leaves, little is known about effect Fe 3 O 4 nanoparticles (NPs) on and yield, especially for medicinal crops. To fill this gap, a single factor experiment was conducted explore effects NPs growth, dry matter distribution, chlorophyll content, photosynthetic characteristics, fluorescence parameters, polysaccharide content Pseudostellaria heterophylla by foliar spraying under field conditions. (20–50 mg·L –1 ) significantly promoted distribution tuber yield per unit area. enhanced net rate ( P n increasing content. And increased daily mean peak value , alleviated phenomenon “midday depression” improving nonstomatal limitation. Chlorophyll parameters indicating that photochemical activity PSII photoinhibition enhancing use excess excitation energy. Gray correlation analysis showed adaptability . photosynthesis high temperatures strong light. Of note, tuber. Phytotoxic recorded at (100 doses. Collectively, could performance performance, its environment, ratio photosynthates underground part.