Mitigation of Salinity Stress in Maize by Silicon Nutrition

Muhammad Ozair, . (2015) Mitigation of Salinity Stress in Maize by Silicon Nutrition. Doctoral thesis, University of Agriculture Faislabad ,Pakistan.

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Salinity stress is a serious threat to crop production around the globe and about 6.3 m ha lands in Pakistan is salt affected. Maize is an important cereal crop having significant impact on Pakistan's economy and food security. Being glycophyte, maize yield is seriously affected if grown on salt affected soils. Nutrition management can improve salinity tolerance in crop. Silicon (Si) is a beneficial element having many beneficial effects, such as improving water use efficiency and enhancement of salt tolerance. We hypothesized that silicon nutrition management can increase growth, yield and production of maize crop under salt stress conditions. To explore the role of Si in alleviating salinity stress in maize and to identify the mechanism responsible for improved growth, a project was proposed with six independent studies to screen maize germplasm for salinity tolerance and response of selected genotypes to applied Si under salinity stress. Various growth and physiological parameters were studied in petri plates, pots, hydroponics and field experiments. The attributes related to maize germination and early vegetative growths were significantly reduced by salinity stress while Si application improved germination parameters and ionic concentration under salt stress. Then vegetative growth was tested in hydroponics where the toxic effects of salt stress on different physiological (chlorophyll contents, chlorophyll fluorescence, gaseous exchange), ionic (Na, K concentration in shoots and roots) and biochemical (enzyme activity assays and phenolic contents) parameters were studied, while Si application minimized both osmotic and oxidative stresses under salt stress. In the field study, grain yield, straw yield, harvest index, number of grains per cob and other parameters related to maize crop production were evaluated in saline and non-saline conditions. Cultivars showed significant genotypic variation and foliar Si application suggested to be a viable strategy for maize growth under saline and non-saline fields. This study implies that Si application could enhance maize growth on every growth stage by manipulating the deleterious effects of salinity.

Item Type: Thesis (Doctoral)
Uncontrolled Keywords: Mitigation , Salinity, Stress, Maize ,Nutrition
Subjects: Q Science > QA Mathematics
Depositing User: Unnamed user with email
Date Deposited: 25 Oct 2017 10:57
Last Modified: 25 Oct 2017 10:57

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