Plant growth promoting Streptomyces strains are selectively interacting with the wheat cultivars especially in saline conditions

Heliyon

Akram Sadeghi¹  Parisa Koobaz²  Shahrokh Gharanjik³  Alireza Akbari³ 

[1] Corresponding author.;Department of Molecular Physiology, Agricultural Biotechnology Research Institute of Iran (ABRII), Education and Extension Organization (AREEO), Karaj, Iran;Department of Plant Breeding and Biotechnology, Faculty of Agricultural Engineering, Shahrood University of Technology, Shahrood, Iran;

关键词: Plant biology;    Streptomyces;    Salt stress;    Wheat;    Antioxidant enzymes;   

DOI  :  

来源: DOAJ

【 摘 要 】

Plant growth promoting (PGP) effect of Streptomyces on wheat growth in different conditions has been mostly reported although mechanisms which caused wheat cultivars differently response to a PGP Streptomyces has been less studied. In this study, the effect of two Streptomyces strains, previously reported as PGPR, on the growth of four salt-sensitive commercial wheat cultivars under normal and saline conditions was investigated. Strain C-2012 differently affected the growth of the cultivars in the normal and stress conditions. Cultivars Gonbad with the highest (63%) and Zarin without increased dry biomass upon C-2012 treatments were selected for further study. Salinity significantly decreased seedling fresh and dry weight, K+ and chlorophyll content and glutathione S-transferase activity. Moreover, the stress increased proline and Na+ content and peroxidase (POX) and ascorbate peroxidase (APX) activity in both cultivars. Strain C-2012, generally, ameliorated the negative effect of the stress with increased chlorophyll and carotenoid and reduced Na+ content and APX and SOD activity in both cultivars, however, its effect on biomass was different. Increase in SOD, APX and POX activities in bacterial inoculated-Zarin, but not Gonbad, under normal conditions suggested that this cultivar may recognize strain C-2012 as a gentle stressor and not as a PGPR. These results showed that the responses of the wheat cultivars to a defined PGPR is different in the physiological, phenotypic and molecular level. Based on the results, the evaluation of the effect of a bio-fertilizer on each wheat cultivar is necessary prior to use in a commercial field.

【 授权许可】

Unknown