Abstract:

To study the effects of perylene diimide photosensitizers and its compound with nitrogen, phosphorus and potassium foliar fertilizers on the growth and development of rapeseed. N,N’-dicyclohexyl-1,7-dicyclohexylamine-3,4,9,10-perylenediimide (PDI-4CHA) was prepared using 1,7-dibromo-3,4,9,10-perylenetetracarboxylic dianhydride (PDI-2Br) as the acceptor and cyclohexylamine as the donor, and subsequently, PDI-4CHA composite nanocapsules (Photosensitizer, PS) were obtained by coating nanosilica on its surface. Rapeseed was used as the experimental material. Five treatments of CK, 0.4% PS, 1.2% PS, 2% PS and 3% PS were set up to investigate the optimal spraying concentration of PS, and six treatments of CK, foliar fertilizer W, 2% PS, 0.4% PS&W, 1.2% PS&W and 2% PS&W were set up to investigate the effects of the photosensitizer and nitrogen, phosphorus, and potassium foliar fertilizer W complex (PS&W) on the growth and development of rapeseed. The results showed that PDI-4CHA composite nanocapsules were successfully synthesized. 2% PS treatment had the best promotion effect on rapeseed when the spraying concentration ranged from 0% to 3%, and the SPAD value, dry weight, and fresh weight of rapeseed were increased by 21.93%, 60.72% and 44.93%, respectively, compared with CK in the last sampling. The experiments on the effect of PS&W treatment on the growth of rapeseed showed that, compared with CK, W and PS treatments, 1.2% PS&W treatment increased fresh weight by 161.43%, 173.90% and 105.46%, and dry weight was increased by 163.98%, 173.92% and 107.64%, respectively. What’s more, the quality of rapeseed treated with PS&W was not worse than that of the control treatment. The experiment proved that perylene diimide photosensitizer and its combination spraying with NPK foliar fertilizer had an efficient effect on rapeseed.

Key words: perylene diimide, photosensitizer, synergistic effect, rapeseed