Volume 2, Issue 4, 2020, Page 38 - 57
Author(s) :
dariush safari *1 , Fatemeh Jamali 2 , Hamid-Reza Nooryazdan 3 , Fereshteh Bayat 4
1 M.Sc Student Plant Breeding Department, Persian Gulf University, Bushehr, Iran
2 Assistant Professor, Plant Protection Department, Persian Gulf University, Bushehr, Iran
3 Assistant Professor, Plant Breeding Department, Persian Gulf University, Bushehr, Iran
4 Assistant Professor, Plant Breeding Department, Persian Gulf University, Bushehr, Iran


Abstract :
The aim of this study was to evaluate the effect of Pseudomonas fluorescence strains with ACC deaminase and IAA activity enhancing plant growth isolated from rhizosphere of wheat plants and to evaluate the effect of Rhizobacterium isolated (PGPR) on growth and yield of five wheat cultivars under salinity stress. Before evaluating the effectiveness of 5 wheat cultivars, we detected ACC deaminase activity, siderefore production, IAA and solubilization of phosphate strains under salinity stress. The best isolate results in ACC deaminase activity, produce IAA, Phosphate Solubization and Siderefore revealed that inoculation with bacterial strains had considerable positive impacts on several growth parameters and yield of wheat cultivars including plant height, peduncle length, spike length, weight and number, number of grains per spike, 1000 -grain weight and grain yield under various levels of salinity (50, 100 and 150 mM NaCl), as compared to uninoculated control. Inoculation with ACC deaminase-producing strains reduced the negative effects of salinity stress and increased wheat growth and yield. In addition, with increasing salinity levels, growth and yield of wheat cultivars decreased, however, cultivars showed different responses to salinity stress. This study demonstrates the effectiveness of growth-promoting rhizobacteria containing ACC deaminase and IAA to increase salt tolerance and thus enhance the growth and yield of wheat cultivars under salinity stress.

Keywords :
ACC Deaminase, IAA, Siderophore, Salt Stress, PGPR