Effects of putrescine and bio fertilizers on yield and grain filling components of wheat ‎‎(Triticum aestivum L.) under salinity condition‎

In order to study the effects of putrescine and bio fertilizers on grain filling ‎components of wheat under salinity condition, a factorial ‎experiment was conducted based on RCBD with three ‎replications in research greenhouse of Faculty of Agriculture and Natural Resources, ‎University of Mohaghegh Ardabili in 2018. Experimental factors were included salinity ‎in four levels [no-salinity as control, salinity 40, 80 and 120 mM NaCl], application of ‎bio fertilizers at four levels [no bio fertilizer, application of both Psedomunas and ‎Flavobacterim, mycorrhiza with Psedomunas and ‎Flavobacterim, mycorrhiza application] and putrescine foliar application ‎‎(foliar application with water as control, foliar application of 0.5 and 1 mM putrescine. ‎Results showed that application of both mycorrhiza with Psedomunas and ‎Flavobacterim and foliar application of 1 mM putrescine increased chlorophyll index ‎‎, yield and yield components under salinity conditions. Maximum of grain filling rate (0.00217 g.day), grain filling period and effective grain ‎filling period (24.1 and 35.57 days respectively), root volume and weight (0.71 g per ‎plant and 1.317 cm3 per plant) were obtained in application of mycorrhiza with ‎Pseudomonas and Flowobacterium under no salinity condition and the minimum of ‎values were obtained in the highest salinity level, no application of bio fertilizers and ‎foliar application of putrescine. Application of mycorrhiza with Pseudomonas and ‎Flavobacterium and foliar application of 1 mM putrescine at the highest salinity level ‎increased grain yield by 28.57% compared to no application of bio fertilizers and no ‎foliar application at the same salinity level. ‎