Effects of Arbuscular Mycorrhizal Fungus and Plant Growth Promoting Rhizobacterium Interaction on Growth Indices and Leaf Proline Concentration of Tomato under Salinity Levels

Authors

1 Former M.Sc Student of Soil Biol. and Biotechnol., Faculty of Agric., Univ. of Tabriz, Iran

2 Prof., Dept. of Soil Sci., Faculty of Agric., Univ. of Tabriz, Iran

Abstract

The soil and water salinity are usually crucial factors in diminishing the growth and production of crops in arid and semiarid areas. Inoculation of plant with plant growth promoting rhizobacteria particularly Pseudomonas andmycorrhizal fungi are helpful ways to facilitate plant growth in saline soils. In this research, the effects of two strains of Pseudomonas fluorescens (P. fluorescens Tabriz(PFT) and P. fluorescens Cha0(PFC))and the mycorrhizal fungus, Rhizophagus irregularis on proline concentration in plant leaves as well as some growth indices of tomato (var. Super strain B) under 4 different levels of salinity (1.56, 3, 6 and 9 dS m-1 S1, S2, S3 and S4, respectively) were studied, The results showed that plant fresh weight was significantly (17.36%) higher in non mycorrhizal plant (-AM) than mycorrhizal plant (+AM) (p<0.05). The bacteria had significant effect on measured parameters. The dry and fresh weight of the root and shoot and chlorophyll index of leaves at the presence of PFC were significantly (p<0.05) higher than those at the presence of PFT and PF0 (non-bacterial control) and application of both bacteria increased root mycorrhizal colonization percentage compared to the PF0 (PFC 34.88% and PFT 31.22%). Root fresh weight and chlorophyll index of the plant increased with the increase of salinity levels up to S3 but at S4 level these two parameters decreased (p<0.05). Also, the root mycorrhizal colonization percentage significantly decreased by increasing the salinity levels while the proline concentration of leaves significantly increased (p<0.05) with enhancement of the salinity.

Keywords


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