Studies Using Mutant Strains of Reveal That Atmospheric Nitrogen Fixation and Auxin Production Are Light Dependent Processes.

As the use of microbial inoculants in agriculture rises, it becomes important to understand how the environment may influence microbial ability to promote plant growth. This work examines whether there are light dependencies in the biological functions of , a commercialized prolific grass-root colonizer. Though classically defined as non-phototrophic, possesses photoreceptors that could perceive light conducted through its host's roots.

Bacteria Promotes Mn Uptake in Maize with Benefits to Leaf Photosynthesis.

is a prolific grass-root colonizing bacteria well-known for its ability to promote plant growth in several cereal crops. Here we show that one of the mechanisms of action in boosting plant performance is through increased assimilation of the micronutrient manganese by the host. Using radioactive Mn (t 5.

Examining effects of rhizobacteria in relieving abiotic crop stresses using carbon-11 radiotracing.

In agriculture, plant growth promoting bacteria (PGPB) are increasingly used for reducing environmental stress-related crop losses through mutualistic actions of these microorganisms, activating physiological and biochemical responses, building tolerances within their hosts. Here we report the use of radioactive carbon-11 (t 20.4 min) to examine the metabolic and physiological responses of Zea mays to Azospirillum brasilense (HM053) inoculation while plants were subjected to salinity and low nitrogen stresses.

Examining the Effects of the Nitrogen Environment on Growth and N-Fixation of Endophytic in Maize Seedlings by Applying C Radiotracing.

as an endophyte and prolific root colonizer of numerous cereal crops, occupies an important ecological niche in agriculture because of its ability to promote plant growth and potentially improve crop yield. More importantly, there exists the untapped potential to harness its ability, as a diazotroph, to fix atmospheric N as an alternative nitrogen resource to synthetic fertilizers. While mechanisms for plant growth promotion remain controversial, especially in cereal crops, one irrefutable fact is these microorganisms rely heavily on plant-borne carbon as their main energy source in support of their own growth and biological functions.

Plant-Growth-Promoting Bacteria Can Impact Zinc Uptake in : An Examination of the Mechanisms of Action Using Functional Mutants of .

Among the PGPB, the genus -with an emphasis on -is likely the most studied microorganism for mitigation of plant stress. Here, we report the investigation of functional mutants HM053, and FP10 of to understand how the biological functions of these microorganisms can affect host Zn uptake. HM053 is a constitutively expressed strain that hyper-fixes N and produces high levels of the plant's relevant hormone auxin.