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Variable responses on early development of shallot (Allium ascalonicum) and mustard (Brassica juncea) plants to Bacillus cereus inoculation


Citation

Ab. Aziz, Zakry Fitri and Mohd Saud, Halimi and Abdul Rahim, Khairuddin and Ahmed, Osumanu Haruna (2012) Variable responses on early development of shallot (Allium ascalonicum) and mustard (Brassica juncea) plants to Bacillus cereus inoculation. Malaysian Journal of Microbiology, 8 (1). pp. 47-50. ISSN 1823-8262; ESSN: 2231-7538

Abstract

Aim: Auxin, a phytohormone secreted by plant growth-promoting rhizobacteria is one of the direct mechanisms vital for plant growth promotion. A laboratory experiment was conducted to observe the effect of IAA-producing and non-IAA-producing diazotroph Bacillus cereus strains on early growth of shallot (Allium ascalonicum) and mustard (Brassica juncea) plants. Methodology and Results: Treatments evaluated were as follows: Control = uninoculated, no inoculation, UPMLH1 = IAA-producing B. cereus UPMLH1, and UPMLH24 = non-IAA-producing B. cereus UPMLH24. Inoculation with IAA-producing B. cereus UPMLH1 significantly increased shallot adventitious roots (root number and length) and shoot growth (19 to 54% increment). Inoculation of non-IAA-producing B. cereus UPMLH24 did not significantly improve growth of adventitious roots of shallot as compared to uninoculated control, except its shoot (up to 40% increase). However, primary roots and shoot growth of mustard plants significantly increased through inoculation with IAA-producing and non-IAA-producing strains (14 to 73% increment). Conclusion, Significance and Impact of Study: The results indicated that exogenous IAA secreted by B. cereus UPMLH1 might have play an important role in inducing roots of shallot bulbs and it may have a variable promotional effect depending on plant species.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Agriculture
Faculty of Agriculture and Food Sciences
Institute of Tropical Agriculture
DOI Number: https://doi.org/10.21161/mjm.33711
Publisher: Malaysian Society for Microbiology
Keywords: Indole-3-acetic acid; Inoculation; Mustard; Plant growth-promoting rhizobacteria; Shallot
Depositing User: Nabilah Mustapa
Date Deposited: 08 Jun 2018 00:25
Last Modified: 08 Jun 2018 00:25
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.21161/mjm.33711
URI: http://psasir.upm.edu.my/id/eprint/63947
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