Kamar M. Abd El-Hai, Abeer Abdulkhalek Ghoniem, Ayman Y. El-Khateeb and Ayman EL-Ghamry( 2019). Mitigation of salinity stress and alternaria leaf spot disease in faba bean by nicotinamidePlantArchivesVol.19,Supplement1,2019pp.823-839e-ISSN:2581-6063 (online),ISSN:0972-5210
Abstract: Vicia faba is one of the most important leguminous crops, where it represents a major constituent of daily food for most of populations. The present investigation aimed to study the influence of salinity stress and Alternaria leaf spot on faba bean cultivars during thresholds of nicotinamide and fungicide Tridex-80. Obtained data pointed out that both of nicotinamide and Tridex-80 had inhibitory effect against Alternaria leaf spot pathogen in vitro. The germination percentage decreased significantly with increasing soil salinity. However, increasing percentage of germination was associated with nicotinamide and Tridex- 80%. Interestingly, low threshold of nicotinamide (200mg/l) was superior to another one, where affected on plant growth parameters. Both of disease incidence and severity of Alternaria leaf spot in faba bean were significantly decreased in the presence of thresholds of nicotinamide and Tridex-80. Likewise, increasing of chlorophyll a, b, polysaccharides, free amino acids, proline and antioxidant enzymes as response to nicotinamide thresholds. Ultimately, the yield productivity was consequently increased as the nicotinamide and Tridex-80 doses against salinity stress and Alternaria leaf spot disease.
Keywords: (Faba bean, Alternaria alternata, nicotinamide, salinity stress, Antioxidant enzymes.)
