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    Plant Growth Promoting Rhizobacteria and Silicon Synergistically Enhance Salinity Tolerance of Mung Bean

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    Type
    Article
    Authors
    Mahmood, Sajid
    Daur, Ihsanullah
    Al-Solaimani, Samir G.
    Ahmad, Shakeel
    Madkour, Mohamed H.
    Yasir, Muhammad
    Hirt, Heribert cc
    Ali, Shawkat cc
    Ali, Zahir cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Desert Agriculture Initiative
    Plant Science
    Plant Science Program
    Date
    2016-06-17
    Permanent link to this record
    http://hdl.handle.net/10754/614898
    
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    Abstract
    The present study explored the eco-friendly approach of utilizing plant-growth-promoting rhizobacteria (PGPR) inoculation and foliar application of silicon (Si) to improve the physiology, growth, and yield of mung bean under saline conditions. We isolated 18 promising PGPR from natural saline soil in Saudi Arabia, and screened them for plant-growth-promoting activities. Two effective strains were selected from the screening trial, and were identified as Enterobacter cloacae and Bacillus drentensis using matrix-assisted laser desorption ionization-time-of-flight mass spectrometry and 16S rRNA gene sequencing techniques, respectively. Subsequently, in a 2-year mung bean field trial, using a randomized complete block design with a split-split plot arrangement, we evaluated the two PGPR strains and two Si levels (1 and 2 kg ha−1), in comparison with control treatments, under three different saline irrigation conditions (3.12, 5.46, and 7.81 dS m−1). The results indicated that salt stress substantially reduced stomatal conductance, transpiration rate, relative water content (RWC), total chlorophyll content, chlorophyll a, chlorophyll b, carotenoid content, plant height, leaf area, dry biomass, seed yield, and salt tolerance index. The PGPR strains and Si levels independently improved all the aforementioned parameters. Furthermore, the combined application of the B. drentensis strain with 2 kg Si ha−1 resulted in the greatest enhancement of mung bean physiology, growth, and yield. Overall, the results of this study provide important information for the benefit of the agricultural industry.
    Citation
    Plant Growth Promoting Rhizobacteria and Silicon Synergistically Enhance Salinity Tolerance of Mung Bean 2016, 7 Frontiers in Plant Science
    Sponsors
    This article was funded by the Deanship of Scientific Research (DSR), King Abdulaziz University, Jeddah. The author, therefore, acknowledge with thanks DSR technical and financial support.
    Publisher
    Frontiers Media SA
    Journal
    Frontiers in Plant Science
    DOI
    10.3389/fpls.2016.00876
    PubMed ID
    27379151
    Additional Links
    http://journal.frontiersin.org/article/10.3389/fpls.2016.00876
    ae974a485f413a2113503eed53cd6c53
    10.3389/fpls.2016.00876
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Plant Science Program; Desert Agriculture Initiative

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