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Effect of salt-tolerant bacterial inoculations on rice seedlings differing in salt-tolerance under saline soil conditions


Citation

Shultana, Rakiba and Tan, Ali Kee Zuan and Yusop, Mohd Rafii and Mohd Saud, Halimi and Fatai, Arolu (2020) Effect of salt-tolerant bacterial inoculations on rice seedlings differing in salt-tolerance under saline soil conditions. Agronomy, 10 (7). pp. 1-22. ISSN 2073-4395

Abstract

Salt-tolerant plant growth-promoting rhizobacteria (PGPR) could be an alternative to alleviate salinity problems in rice plants grown in the coastal areas. This study was conducted to isolate and characterize salt-tolerant PGPR and observe their effects on the physiological and biochemical properties of rice plants grown under non-saline and saline glasshouse conditions. Three strains were selected based on their salt-tolerance and plant growth-promoting properties under in vitro saline conditions. These strains were identified as Bacillus tequilensis (UPMRB9), Bacillus aryabhattai (UPMRE6), and Providencia stuartii (UPMRG1) using a 16S rRNA technique. The selected strains were inoculated to three different rice varieties, namely BRRI dhan67 (salt-tolerant), Putra-1 (moderate salt-tolerant), and MR297 (salt-susceptible) under glasshouse conditions. Results showed that the MR297 rice variety inoculated with UPMRB9 produced the highest total chlorophyll content, with an increment of 28%, and lowest electrolyte leakage of 92%. The Putra-1 rice variety also showed a 156% total dry matter increase with the inoculation of this bacterial strain. The highest increase of relative water content and reduction of Na/K ratio were found upon inoculation of UPMRE6 and UPMRB9, respectively. The biggest significant effects of these bacterial inoculations were on relative water content, electrolyte leakage, and the Na/K ratio of the BRRI dhan67 rice variety under saline conditions, suggesting a synergistic effect on the mechanisms of plant salt-tolerance. This study has shown that the application of locally-isolated salt-tolerant PGPR strains could be an effective long-term and sustainable solution for rice cultivation in the coastal areas, which are affected by global climate change.


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Official URL or Download Paper: https://www.mdpi.com/2073-4395/10/7/1030

Additional Metadata

Item Type: Article
Divisions: Faculty of Agriculture
Institute of Tropical Agriculture and Food Security
DOI Number: https://doi.org/10.3390/agronomy10071030
Publisher: Multidisciplinary Digital Publishing Institute
Keywords: PGPR; Salt-tolerant; Rice; Salinity; Dry matter
Depositing User: Ms. Nuraida Ibrahim
Date Deposited: 03 Nov 2021 07:03
Last Modified: 03 Nov 2021 07:03
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/agronomy10071030
URI: http://psasir.upm.edu.my/id/eprint/88634
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