Combination of endophytic and rhizospheric plant growth promoting rhizobacteria in Oryza sativa shows higher accumulation of osmoprotectant against saline stress

Abstract

The effect of endophytic and rhizospheric bacteria was studied on salt stress in a local paddy rice (Oryza sativa L.) variety GJ-17. Plants inoculated with endophytic bacterium Pseudomonas pseudoalcaligenes showed significantly higher concentration of glycine betaine-like quaternary compounds and higher shoot biomass at lower salinity levels. While at higher salinity levels, mixture of both P. pseudoalcaligenes and Bacillus pumilus showed better response against the adverse effects of salinity. However, accumulation of proline showed an opposite trend against plant growth promoting rhizobacteria (PGPR) treatment in salinity stress. Proline concentration increased with salinity but decreased in plants inoculated with either of the PGPRs or mixture of both P. pseudoalcaligenes and B. pumilus. The present study shows that inoculation of paddy rice (Oryza sativa L.) with a mixture of endophytic and rhizospheric bacteria could serve as a useful tool for alleviating salinity stress.

Characterisation of endophytic bacteria from a desert plant Lepidium perfoliatum L.

“…Currently, endophytic bacteria are attracting increasing attention not only for their promotion of plant growth and control of plant diseases (Hallmann et al 2011), but also for their stress tolerance and improvement of plant growth in an extreme environmen (Forchetti et al 2010;Jha et al 2011;Karthikeyan et al 2012;Ali et al 2014;Naveed et al 2014a, b;Qin et al 2014;Cherif et al 2015). Phoenix dactylifera L. root endophytic bacteria that were isolated from the environment of desert oasis promoted plant growth under drought conditions (Cherif et al 2015).…”

“…The endophytic bacterium A. xylosoxidans that was isolated from the root tissue of Catharanthus roseus was able to mitigate salt stress in C. roseus (Karthikeyan et al 2012). Inoculation of rice (Oryza sativa L.) with the endophytic bacterium P. pseudoalcaligenes that was isolated from the root tissue could increase shoot biomass at lower saline levels ( Jha et al 2011).…”

Microbial Inoculants for Soil Quality and Plant Health

“…The crop plants inoculated had a better developed root and a better K + : Na + ratio in the shoot (Shilev et al 2012). In the same vein, Jha et al (2011) discovered that the inoculation of a local paddy rice with Pseudomonas pseudoacaligenes and Bacillus pumilus in saline soil resulted in a decrease in growth suppression evident by an increased dry weight. The microbial inoculants also induced some osmoprotectants which help to overcome the deleterious effects of salt stress.…”

Exploring the Potential of Endophytes in Agriculture: A Minireview

“…Endophytes show similar effects due to drought stress [57]. Likewise, plants deal with salinity stress by accumulating endophyte mediated glycine betain-like compounds [58]. Also, abscisic acid (ABA) secreted by Azospirillum lipoferum alleviate water-stress of maize plants.…”