Abstract
Plant growth promoting rhizobacteria (PGPR) are associated with rhizosphere as well as non-rhizosphere. PGPR are involved
in plant growth promotion through different direct and indirect mechanisms. The excessive and imbalanced use of chemical
fertilizers is a burning issue. The scientists are emphasizing on reducing the use of chemical fertilizers and moving towards
biological approaches. The current study includes isolation, screening, and characterization of bacteria isolated from potato
rhizosphere. The bacterial isolates were characterized for siderophore production, iron solubilization, phosphate solubilization,
auxin production, catalase and chitinase activity. All the bacterial isolates were found positive for phosphorous solubilization,
indole acetic acid (IAA), siderophore and catalase activity. Further, bacterial isolates were tested in a growth chamber for their
growth promoting potential in potato. Out of eleven bacterial isolates, two bacterial isolates (O-13 and K-10) significantly
improved the agronomic and physiological parameters (SPAD, chlorophyll a, b and carotenoids) under axenic condition. It
was concluded that bacterial isolates can be used to improve growth and yield of potato. However, there is a dire need to
explore the character involved in growth promotion of selected rhizobacteria under field conditions to verify their response in
growth promotion and to reduce the use of chemical fertilizers. The current experiment leads towards interactive approach of
microbial inoculation and chemical fertilizers, ultimately reducing the use of chemical fertilizers
Zain Mushtaq, Hafiz Naeem Asghar, Zahir Ahmad Zahir, Muhammad Maqsood. (2021) CHARACTERIZATION OF RHIZOBACTERIA FOR GROWTH PROMOTING TRAITS AND THEIR POTENTIAL TO INCREASE POTATO YIELD, Pakistan Journal of Agricultural Sciences, Volume 58, Issue 1.
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