Vida de vaso e parâmetros bioquímicos de rosa cv. Avalanche são afetados pela aplicação foliar de nitroprussiato de sódio e putrescina

Abstract

Abstract The effects of foliar spraying of sodium nitroprusside (SNP) and putrescine (Put) on rose cv. Avalanche were investigated. This experiment was conducted in a factorial trial with two factors, including SNP at four levels of 0, 50, 100 and 200 μM and putrescine at four concentrations of 0, 1, 2, and 4 mM with three replications in hydroponic conditions in the greenhouse. Some of the recorded traits included the number of leaves plant-1, leaf area, fresh and dry leaf weight, as well as determination of soluble sugars, and total protein. Also, in the post-harvest stage, the recoded traits included malondialdehyde (MDA) content, relative fresh weight, and vase life. SNP at a concentration of 100 μM was found to improve morphological traits including fresh and dry weight of leaf (4.3 and 1.4 g, respectively) compared to the control. It also increased total protein (0.85 mg g-1 FW), decreased postharvest MDA content (0.32 µM g-1 FW), and increased vase life (23.66 days) at 100 μM level, and increased leaf area (7671 mm2) and flower relative fresh weight (27.65%) at 200 μM level. Among different rates of putrescine, 4 mM putrescine was associated with higher leaf area (8056.7 mm2), fresh and dry leaf weight (4.3 and 1.3 g, respectively), soluble sugars (4.63 mg g-1 FW), lower post-harvest MDA content (0.32 µM g-1 FW), and increased duration of vase life (26 days). In general, SNP and putrescine improved rose growth parameters and post-harvest traits.