The role of Plant Growth Promoting Bacteria in improving nitrogen use efficiency for sustainable crop production: a focus on wheat

Abstract

Due to the increase in both human population growth and environmental pressure, it is necessary to raise agricultural productivity without enhancing environmental footprint. Within this context, soil inoculation with PGPB (Plant Growth Promoting Bacteria) may be considered a promising tool of integrated management systems. In particular, PGPB may improve plant growth either directly, by facilitating resource use or modulating plant hormone levels, or indirectly by decreasing the inhibitory effects of various pathogenic agents. PGPB comprise different functional and taxonomic groups of bacteria like Pseudomonas, Bacillus, Rhizobium and others. Their ability to either mobilize mineral or organic bound nutrients from the pedosphere or to fix atmospheric N 2 and make it available to the plants, is a crucial feature in their application. In literature some data are available on the use of commercial PGPB, while less efforts have been made on the study of the effect of autochthonous PGPB isolated from soils on sustainability of cropping systems; thus a literature survey on these aspects was carried out with special focus on wheat, a staple food for a large part of world population. In particular, the main topic of this review is the potential of PGPB to enhance use efficiency of agro-environmental resources focusing on the interaction PGPB-wheat for improving nitrogen use efficiency.

Nitrogen availability and genotype affect major nutritional quality parameters of tef grain grown under irrigation

“…Numerous reasons may account for the observed variety effects, including inherent genetic variation in N-use efficiency as was previously reported for tef 33 , 36 , possibly due to a rhizobacteria effects, as was indicated for wheat 72 and tef 73 . Moreover, tef varieties may differ in N-utilization through biosynthetic pathways, e.g.…”

Effect of Plant Growth Promoting Bacteria on the Growth of Wheat Seedlings Subjected to Phosphate Starvation

“…Although both isolates are equally capable of solubilizing inorganic forms of phosphorous, 12A is also able to produce IAA and furthermore has a superior P mineralizing capacity compared to 25A [32]. The IAA production represents an important selection criterion for bacteria with regards to their application as bio-fertilizer for cultivated plants [1,36,37]. Bacteria that produce IAA and promote plant growth were described for different crops such as maize, wheat, soybean and rice [37][38][39][40].…”

“…The IAA production represents an important selection criterion for bacteria with regards to their application as bio-fertilizer for cultivated plants [1,36,37]. Bacteria that produce IAA and promote plant growth were described for different crops such as maize, wheat, soybean and rice [37][38][39][40]. It is known that high levels of bacterial IAA are associated with lateral and adventitious root formation [38,40,41].…”

Microbial Monitoring in the EDEN ISS Greenhouse, a Mobile Test Facility in Antarctica

“…Overall, the quantity and quality of the identified microorganisms from the EDEN ISS container, as well from the plants themselves are part of a normal plant microbiome. Moreover, this microbiome can counteract to plant pathogenic outbreaks, and some of these bacteria are known as growth enhancer (Berg et al, 2014;Di Benedetto et al, 2017). From the point of view to get more food out of the greenhouse, it is desirable for these organisms to be present there.…”