Evaluation of ACC-deaminase-producing rhizobacteria to alleviate water-stress impacts in wheat (Triticum aestivum L.) plants

• Published in: Canadian journal of microbiology Vol. 65; no. 5; pp. 387 - 403
• Main Authors: Chandra, Dinesh, Srivastava, Rashmi, Gupta, Vadakattu V.S.R, Franco, Christopher M.M, Sharma, Anil Kumar
• Format: Journal Article
• Language: English
• Published: Canada NRC Research Press 01.05.2019; Canadian Science Publishing NRC Research Press
• Subjects: 1-aminocyclopropane-1-carboxylate (ACC) deaminase; 1-aminocyclopropane-1-carboxylate (ACC) désaminase; Achromobacter; Agricultural research; Agriculture; antioxidant properties; Antioxidants; Antioxidants (Nutrients); Bacteria; bactéries promotrices de la croissance végétale; blé (Triticum aestivum L.); Carboxylic acids; Consortia; drought; Droughts; Experiments; Fixation; foliar nutrients; Greenhouses; Inoculation; Irrigation; Microbiology; Nitrogenation; Nutrient concentrations; nutriments foliaires; Ochrobactrum; Phosphates; Plant growth; Plant growth promoting substances; plant-growth-promoting bacteria; Plant-water relationships; pluvial; propriétés antioxydantes; Pseudomonas; Rain; rain-fed; Rainfed farming; Rhizobium; Soils; Solubilization; stress hydrique; sécheresse; Triticum aestivum; Water; Water resources; Water stress; Wheat; wheat (Triticum aestivum L.); India; plant-growth-promoting bacteria; 1-aminocyclopropane-1-carboxylate (ACC) désaminase; foliar nutrients; stress hydrique; propriétés antioxydantes; antioxidant properties; blé ( L.); drought; nutriments foliaires; water stress; bactéries promotrices de la croissance végétale; pluvial; sécheresse; 1-aminocyclopropane-1-carboxylate (ACC) deaminase; wheat ( L.); rain-fed
• ISSN: 0008-4166; 1480-3275
• DOI: 10.1139/cjm-2018-0636

Application of plant-growth-promoting rhizobacteria (PGPR) is an environmentally sustainable option to reduce the effects of abiotic and biotic stresses on plant growth and productivity. Bacteria isolated from rain-fed agriculture field soils in the Central Himalaya Kumaun region, India, were evaluated for the production of 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase. Those producing ACC deaminase in high amounts were evaluated for their potential to improve wheat (Triticum aestivum L.) plant growth under irrigated and water-stress conditions in two glasshouse experiments. Some of the isolates also showed other plant-growth-promoting (PGP) traits, e.g., N 2 fixation, siderophore production, and phosphate solubilization; however, strains with higher ACC deaminase activity showed the greatest effects. These were Variovorax paradoxus RAA3; Pseudomonas spp. DPC12, DPB13, DPB15, DPB16; Achromobacter spp. PSA7, PSB8; and Ochrobactrum anthropi DPC9. In both simulated irrigated and water-stress conditions, a single inoculation of RAA3 and a consortium of DPC9 + DPB13 + DPB15 + DPB16 significantly improved wheat plant growth and foliar nutrient concentrations and caused significant positive changes in antioxidant properties compared with noninoculated plants especially under water stress. These findings imply that PGPB having ACC deaminase activity together with other PGP traits could potentially be effective inoculants to improve the growth of wheat plants in water-stressed rain-fed environments.