Influence of plant growth promoting bacteria and Cr6+ on the growth of Indian mustard.
The Cr(6+) resistant plant growth promoting bacteria (PGPB), Pseudomonas sp. PsA4 and Bacillus sp. Ba32 were isolated from heavy metal contaminated soils and their plant growth promoting activity on the Indian mustard (Brassica juncea) were assessed with different concentrations of Cr(6+) in soil. Production of siderophores and the solubilization of phosphate were observed in both strains, PsA4 and Ba32. Production of IAA was only observed in strain PsA4. Inoculation of PsA4 or Ba32 promoted the growth of plants at 95.3 and 198.3 microg of Cr(6+)g(-1) soil. The maximum growth was observed in the plants inoculated with strain PsA4. Both strains, PsA4 and Ba32 did not influence the quantity of accumulation of chromium in root and shoot system. The present observations showed that the strains PsA4 and Ba32 protect the plants against the inhibitory effects of chromium, probably due to the production of IAA, siderophores and solubilization of phosphate.
Rajkumar
M
M
Division of Bioresources Science, College of Agriculture, Chonbuk National University, Jeonju 561-756, Republic of Korea. mraaj13@yahoo.com
Nagendran
R
R
Lee
Kui Jae
KJ
Lee
Wang Hyu
WH
Kim
Sung Zoo
SZ
D001407:Bacillus / Q000187:drug effects / Q000302:isolation & purification / Q000378:metabolism*; D002857:Chromium / Q000493:pharmacokinetics / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D024881:Drug Resistance, Bacterial; D007210:Indoleacetic Acids / Q000378:metabolism; D009149:Mustard Plant / Q000187:drug effects / Q000254:growth & development* / Q000382:microbiology*; D010710:Phosphates / Q000378:metabolism; D011549:Pseudomonas / Q000187:drug effects / Q000302:isolation & purification / Q000378:metabolism*; D012995:Solubility
D007210:Indoleacetic Acids; D010710:Phosphates; D002857:Chromium; C030737:indoleacetic acid