Endophytic bacteria (Sphingomonassp. LK11) and gibberellin can improveSolanum lycopersicumgrowth and oxidative stress under salinity

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Abstract
This study aims to understand the effects of salinity on the growth and oxidative stress enzymes of endophytic bacteria (Sphingomonas sp. LK11) and tomato plants. In response to salinity and gibberellic acid (GA4), catalase (CAT), superoxide dismutase, and reduced glutathione were significantly regulated in LK11 as compared to peroxidase (POD) and polyphenol oxidase (PPO). Salinity stress to tomato plants caused significant cessation in growth and biomass, which was accompanied by threefold increase in lipid peroxidation and decrease in glutathione, CAT, POD, and PPO activities. In contrast, sole and combined treatment of LK11 and GA4 rescued plant growth and biomass production whilst exhibited lower lipid peroxidation and higher glutathione content under salinity stress. The activities of CAT, POD, and PPO were either lower or nonsignificant as compared to control. In conclusion, inoculation of bacterial endophytes offers a relative stress counteracting potentials as evidenced by the known plant growth regulators.
Funding Information
  • FURAP-2 University of Nizwa Research Fund (A/13-14-UoN/01/Chair MPMNP/IF)
  • Basic Science Research Program of National Research Foundation, Ministry of Education, Republic of Korea (2014R1A1A2A10058022)

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