Influence of plant growth promoting microorganisms on growth and antioxidant enzymes activities in strawberry under water stress condition
摘要
Water stress is one of the most harmful abiotic stresses alters the activity of soil microorganisms including enzyme production leading to a decrease in soil fertility. The present investigation aimed to examine the effect of plant growth promoting microorganisms on the performance of strawberry under water stress condition. The results showed that, maximum growth characteristics were recorded with untreated control (T1) where no microbial application and no water stress was given. Among the water stress treatments, the combined application of Azotobacter + Phosphorous solubilizing bacteria + Trichoderma (T8) produced highest plant height (11.90 cm), number of leaves per plant (5.73), shoot length (10.62 cm), root length (13.11 cm after harvest), shoot fresh weight (23.73 g after harvest), root fresh weight (6.18 g after harvest), shoot dry weight (4.51 g), root dry weight (0.95 g), leaf chlorophyll content (41.21 SPAD unit), number of crowns per plant (7.07), relative water content (67.88%), catalase activity (39.29 µmol of H2O2 oxidized min− 1), ascorbate peroxidase activity (0.22 µmol ascorbate oxidized/ min/ mg protein), superoxidase dismutase activity (2.85 units/mg protein), lowest lipid peroxidation (57.86 nmol TBARS/ g fresh weight), lowest hydrogen peroxide content (25.14 nmoles/ g fresh weight), proline content (59.90 µmoles/g tissue), leaf carbohydrates content (30.22 mg/100 g) and ascorbic acid content (40.68 mg/100 g) under water stress condition. Overall, the combined application of microorganisms (T8) was observed to be the most efficient treatment in improving all the morphological, biochemical traits and decreased the accumulation of reactive oxygen species due to the production of antioxidant enzymes as compared to the application of individual microbes under water stress condition.