Based on a finding made by farmers who noticed a good growth and a reduced incidence of phytopathogenic infections of wheat grown between the rows of olive trees, we have screened diazotrophic endophytic PGPB associated with olive tree for plant stress tolerance improving capability. Strains were selected following a biochemical characterization of plant growth promotion activities such as ability of antimicrobial production, azote fixation,… Among the selected strains, BCLRB2 was the strain that shown the most efficient capacity to fix atmospheric nitrogen, which is the most prominent factor of all plant growth parameters under stressful environments. The strain BCLRB2, identified as Bacillus sp, had ACC deaminase, and highly stimulatory effect in vitro associated with high production of hydrolytic enzymes, AIA, and solubilization of tricalcium phosphate. The efficiency of BCLRB2 strain was explored for in vivo pot plant growth. As a result, inoculated plants with Bacillus sp. BCLRB2, showed the best growth of durum wheat seedlings compared to a control under salt stress and natural conditions. Total length, fresh weight, and total dry weight were significantly higher in inoculated plants compared to uninoculated ones.
The present study was conducted to isolate and identify PGPB associated with two halophyte plants from coastal saline site. These strains were tested for improved crop productivity under salinity conditions. Four strains namely MA9, MA14, MA17 and MA19 were selected The PGPB-inoculated plants were relatively healthy and hydrated, whereas the uninoculated plant leaves were desiccated in the presence of 125 mM NaCl. The percentage of water content (PWC) in the plant was also significantly higher in inoculated plants compared to uninoculated ones. Under greenhouse experiments, our data revealed that experiments using seed biopriming on non-sterile soil supplemented with NaCl permitted to identify the most efficient isolates which offered the best vegetable criteria by significantly increasing root and shoot length, root and shoot dry weights, area of the root system and thousand seed mass in plant growth trials. The benefic effect of seed biopriming was more pronounced in soil samples added with NaCl than that of untreated soil. Seed biopriming by efficient PGPB strains induced salinity tolerance of wheat and therefore enhanced their productivity under salinity.
Background and aim: Improved crop productivity under stressful conditions is a major asset of global agriculture. Salinity is one of the most severe abiotic stresses limiting crop yield. Further, a saltaffected area in Tunisia is fast escalating due to intrusion of saline water on arable land and the use of chemical fertilizers and pesticides. Moreover, climate change scenarios showed the increased risk of salinization at different latitudes. Therefore, a great effort is required for maintaining crop production under limiting factors. The present study was conducted to isolate and identify PGPB associated with the halophyte Salicornia brachiata from the coastal saline sites and evaluation their bacterization effect of durum wheat seeds with "Biopriming" technology. Methods:The selection parameters of PGPB strains were based on the ability to promote the growth of plants under stressful conditions. On the other hand, the effect of selected isolates on germination of durum wheat (Triticum durum) was assessed in vivo conditions. The treatment with bacteria was applied on purified and combined strain under 25 and 125 mM NaCl.Results: A total of 22 isolates were selected in-vitro for studying their plant growth-promoting (PGPB) ability including, tolerance with salt concentration, ACC deaminase activity, N 2 fixation, phosphorus solubilization, and indole-3-acetic acid (IAA), out of which, three strains (MA9, MA32, and SA62) were selected. Our data revealed that experiments using treated with NaCl and bioprimed seed permitted us to identify the most efficient isolates in a combined culture which offered the best rate of germination and the highly vegetable growth of explants (roots and shoots). In fact, the benefic effect of seed biopriming was more pronounced in samples added with NaCl than that of untreated samples. Conclusion:Seed biopriming with efficient PGPB strains induced salinity tolerance of wheat and therefore enhanced their rate of germination and growth of explants under salinity.
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