The polyamine spermine in retarding salinity-induced stress in canola
Middle East Journal of Applied Sciences
Salinity is one of the most heightened threats to global agriculture and sustainable development, which is expected to exacerbate by climate change. The current study aims at assessing the effect of a number of salinity concentrations (250 ppm as tap water, 3000 and 6000 ppm) under the use of spermine (0, 50 and 100 ppm) on canola plant, including the oxidative adaptations, growth and yield productivity. A greenhouse experiment was conducted in this context during winter season of (2015/16) in
... randomized complete block design with nine treatments and three replicates. The use of spermine alone promoted greater vegetative growth and efficient crop production. Under salinity treatment plants appeared stressed, resulting in decadent vegetative growth and poor productivity in particular at the high concentration. Exogenous application of spermine compensated for the low vegetative growth of salt stressed plants, and resulted in more robust plants for seed formation by adjusting the homeostatic equilibrium at cellular and molecular levels. The reversal of inhibitory effect of salinity stress was conferred by triggering the activity of enzymatic [i.e., glutathione reductase (GR), ascorbate peroxidise (APX), phenylalanine ammonia lyase (PAL)] and non-enzymatic [i.e., glutathione (GSH) and ascorbate (AsA), total phenols] antioxidant systems as well as reducing oxidants of the detrimental reactive oxygen species (ROS). The greatest values were obtained under the use of spermine at 100 ppm concentration with a conspicuous impact in reducing electrolytes leaked from affected tissues. It follows from this that spermine is significant in neutralizing salinity-induced harmful impacts, and that using it at the proper rate can be quite beneficial in the exploitation of saltwater to irrigate important crops such as canola.