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The Effect of Plant Growth Promoting Rhizobacteria on Barley Seedling Growth, Nutrient Uptake, Some Soil Properties, and Bacterial Counts

Cakmakci, Ramazan; Donmez, M.Figen and Erdogan, Ummugulsum (2007) The Effect of Plant Growth Promoting Rhizobacteria on Barley Seedling Growth, Nutrient Uptake, Some Soil Properties, and Bacterial Counts. [Bitki Geliflmesini Teflvik Eden Bakterilerin Arpa geliflimi, Besin Al›m›, Baz› Toprak Özellikleri ve Bakteri Say›s›na Etkisi.] TURKISH JOURNAL OF AGRICULTURE AND FORESTRY Turk J Agric For, 31, pp. 189-199.

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Online at: http://journals.tubitak.gov.tr/agriculture/index.htm;jsessionid=F3495617EF07EFA31ACF22592F549A18

Summary

This study was conducted with barley in greenhouse conditions in order to investigate seed inoculation with 5 different
N2-fixing (Bacillus licheniformis RC02, Rhodobacter capsulatus RC04, Paenibacillus polymyxa RC05, Pseudomonas putida RC06, and
Bacillus OSU-142) and 2 different phosphate-solubilising (Bacillus megaterium RC01 and Bacillus M-13) bacteria in comparison to
control and mineral fertiliser (N and P) application. Among the strains used in the present study, 6 plant growth promoting
rhizobacteria (PGPR) stimulated indole acetic acid (IAA) production and 3 of them stimulated phosphate solubilisation; all bacterial
strains fixed N2 and significantly increased the growth of barley. Available phosphate in soil was significantly increased by seed
inoculation with Bacillus M-13 and B. megaterium RC01. Maximum NO3-N was found in soil after inoculation with N2-fixing Bacillus
OSU-142, followed by P. polymyxa RC05 and R. capsulatus RC04. Total culturable bacteria count increased in all treatments with
time, whereas N2-fixing bacteria decreased with time, except with B. megaterium RC01 inoculation. The data suggest that seed
inoculation of barley with plant PGPR increased root weight by 17.9%-32.1% as compared to the control, and increased shoot
weight by 28.8%-54.2%, depending on the species. N2-fixing bacterial inoculation significantly increased uptake of N, Fe, Mn, and
Zn by barley. The production of hormones is suggested to be one of the mechanisms by which PGPR stimulate barley growth.
Effective Bacillus species, such as OSU-142, RC07, M-13, P. polymyxa RC05, P. putida RC06, and R. capsulatus RC04, may be used
in agriculture.

Summary translation

Bu araflt›rmada befl azot fikseri (Bacillus licheniformis RC02, Rhodobacter capsulatus RC04, Paenibacillus polymyxa RC05,
Pseudomonas putida RC06 ve Bacillus OSU-142) ve iki fosfat çözücü (Bacillus megaterium RC01 ve Bacillus M-13) bakteri
afl›lamas›n›n kontrol, N ve P gübresi ile karfl›laflt›rmal› olarak sera koflullar›nda arpa bitkisinin geliflimi üzerine etkisi test edilmifltir.
Test edilen bitki geliflimini teflvik edici bakterilerin (PGPR) alt›s›n›n indol asetik asit üretti¤i, üçünün fosfat çözebildi¤i ve bütün
izolatlar›n azot fiksetti¤i ve arpa geliflimini teflvik etti¤i belirlenmifltir. Bacillus M-13 ve B. megaterium RC01 afl›lamas› toprakta
al›nabilir P miktar› önemli ölçüde art›rm›flt›r. Toprakta en yüksek NO3-N miktar› Bacillus OSU-142 afl›lamas›yla elde edilirken, bunu
P. polymyxa RC05 ve R. capsulatus RC04 takip etmifltir. Bütün uygulamalar toprakta toplam bakteri say›s›n› art›rm›fl, topraktaki
azot fikseri say›s› B. megaterium RC01 d›fl›ndaki uygulamalarla zamanla azalm›flt›r. Bitki geliflimini teflvik edici bakteri afl›lamalar›,
bakteri sufllar›na ba¤l› olarak, arpa kök a¤›rl›¤›n› %17.9-32.1, gövde a¤›rl›¤›n› ise % 28.8- 54.2 oran›nda art›rm›flt›r. Azot fikseri
bakteri afl›lamalar› arpa N, Fe, Mn ve Zn al›m›n› önemli düzeyde art›rm›fl ve bakterilerce hormon üretiminin bitkisel geliflimi teflvik
mekanizmalardan biri oldu¤u belirlenmifltir. Bacillus OSU-142, RC07 ve M-13 gibi etkin Bacillus türlerinin ve P. polymyxa RC05, P.putida RC06 ve R. capsulatus RC04 izolatlar›n›n tar›mda kullan›labilece¤i sonucuna var›lm›flt›r.

EPrint Type:Journal paper
Keywords:Plant growth-promoting bacteria, IAA, nitrogen fixation, phosphate solubilisation, barley,Bitki gelişimini teşvik edici bakteri, ‹AA, azot fiksasyonu, fosfat çözücülü¤ü, arpa
Subjects:"Organics" in general
Soil > Nutrient turnover
Soil
Research affiliation: Turkey > Erzurum Atatürk University
Turkey
Deposited By: VURAL, Dr. Aysen ALAY
ID Code:31215
Deposited On:20 Feb 2017 08:38
Last Modified:20 Feb 2017 08:38
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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