The ability of tested rhizomicrobial isolates (Serratia marcescens and Trichoderma
harzianum) along with a strain of root nodule bacteria (Bradyrhizobium spp.) to exhibit some
PGP-properties was evaluated in vitro conditions. The main PGP-properties, namely the ability
to solubilize-P and production of IAA, as well as production of siderophores and HCN were examined.
Additionally, field trials were conducted on sandy loam soil at El-Tahrir Province during two
successive summer seasons to study the effect of co-inoculation with Bradyrhizobium either individually
or together with S. marcescens and/or T. harzianum on nodulation, some plant growth characters,
peanut yield and its yield components. The in vitro experiment revealed that all of the tested
microorganisms were apparently able to trigger PGP-properties. Phosphate solubilization was the
common feature of the employed microorganisms. However, T. harzianum appeared to be superior
to other microorganisms, and Bradyrhizobium displayed the lowest capacity. The ability of the
microorganisms to produce indole compounds showed that S. marcescens was more effective in
IAA production and followed by Bradyrhizobium. Capacity of S. marcescens and T. harzianum
to excrete ferric-specific ligands (siderophores) and HCN was detected, while Bradyrhizobium failed
to produce such compounds. Results of field trials showed that the uninoculated peanut had the
least nodulation status, N2-ase activity and all vegetative growth characters in both studied seasons.
Bacterization of peanut seeds with bradyrhizobia exerted considerable improvement in number and
mass of root nodules, increased the rate of acetylene reduction and all growth characters in
The ability of tested rhizomicrobial isolates (Serratia marcescens and Trichodermaharzianum) along with a strain of root nodule bacteria (Bradyrhizobium spp.) to exhibit somePGP-properties was evaluated in vitro conditions. The main PGP-properties, namely the abilityto solubilize-P and production of IAA, as well as production of siderophores and HCN were examined.Additionally, field trials were conducted on sandy loam soil at El-Tahrir Province during twosuccessive summer seasons to study the effect of co-inoculation with Bradyrhizobium either individuallyor together with S. marcescens and/or T. harzianum on nodulation, some plant growth characters,peanut yield and its yield components. The in vitro experiment revealed that all of the testedmicroorganisms were apparently able to trigger PGP-properties. Phosphate solubilization was thecommon feature of the employed microorganisms. However, T. harzianum appeared to be superiorto other microorganisms, and Bradyrhizobium displayed the lowest capacity. The ability of themicroorganisms to produce indole compounds showed that S. marcescens was more effective inIAA production and followed by Bradyrhizobium. Capacity of S. marcescens and T. harzianumto excrete ferric-specific ligands (siderophores) and HCN was detected, while Bradyrhizobium failedto produce such compounds. Results of field trials showed that the uninoculated peanut had theอย่างน้อย nodulation สถานะ N2-ase กิจกรรม และอักขระเติบโตผักเรื้อรังทั้งหมดทั้งศึกษาซีซั่นBacterization ของเมล็ดถั่วลิสงมี bradyrhizobia นั่นเองพอสมควรปรับปรุงจำนวน และโดยรวมของราก nodules ลดกับอะเซทิลีนและอักขระทั้งหมดของการเจริญเติบโตในอัตราที่เพิ่มขึ้น
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