Pseudomonas monteilii PN1: a great potential P-nitrophenol degrader with plant growth promoting traits under drought and saline-alkali stresses.

Affiliation

College of Plant Sciences, Jilin University, 5333 Xi'an Road, Changchun, Jilin, 130062, People's Republic of China. [Email]

Abstract

OBJECTIVE : To evaluate Pseudomonas monteilii strain PN1 for the removal efficiency of P-nitrophenol (PNP) in soils and its growth promotion of maize (Zea mays L.) seedlings under drought and saline-alkali stress.
RESULTS : PN1 can survive in soils contaminated with PNP dosage between 90 and 155 mg/kg and considerably improved the removal PNP efficiency in soils. Drought and saline-alkali stress reduced maize seedling growth (root length, shoot height and dry or fresh weight) and improved the antioxidant enzyme activities and malondialdehyde (MDA) and proline (PRO) contents. However, maize seedlings treated with PN1 remarkably promoted their growth compared with the control. The reduction in antioxidant enzyme activities and MDA and PRO contents was significant. This result may be correlated to the increased tolerance of maize seedlings to drought and saline-alkali stress.
CONCLUSIONS : Application of P. monteilii PN1 can be an extremely useful approach for the development of bioinoculants in improving plant tolerance to several abiotic stresses and removing PNP in soils to ensure secure crop production.

Keywords

Degradation,Drought stress,P-nitrophenol,Plant growth promotion,Pseudomonas monteilii PN1,Saline–alkali stress,