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Author Kakar K.U., Ren X.L., Nawaz Z., Cui Z., Li B., Xie G., Hassan M.A., Ali E., Sun G.
Title Consortium of rhizobacterial strains and biochemical growth elicitors improve cold and drought stress tolerance in rice (Oryza sativa L.).
Abstract:
In present study, a consortium of two rhizobacteria Bacillus amyloliquefaciens Bk7 and Brevibacillus laterosporus B4 termed as "BB", biochemical elicitors salicylic acid and beta-aminobutyric acid (SB), and their mixture (BBSB) were investigated for cold and drought stress tolerance in rice plants. After withholding water for 16 days, rice plants treated with BBSB showed 100% survival rates; improved seedling heights (35.4 cm), shoot numbers (6.12); and showed minimum symptoms of chlorosis (19%), wilting (4%), necrosis (6%) and rolling of leaves. Likewise, BB inoculation enhanced the plant growth and reduced overall symptoms in rice seedlings subjected to 0 ± 5 °C for 24 h. Our results also implicated numbers of mechanisms underlying BB and BBSB-elicited stress tolerance. In contrast to control, both treatments significantly decreased the leaf monodehydroascorbate (MDA) content and electrolyte leakage, and increased the leaf proline and cholorophyll contents. Moreover, the activities of antioxidant enzymes, superoxide dismutase (SOD) and catalase (CAT) were increased by 3.0 and 3.6-folds respectively. Moreover, the expression of OsMYB3R-2, OsDIL, OsDREB1A and OsCDPK13 genes were significantly up-regulated, suggesting that these genes play important role in abiotic stress tolerance of rice plants. In addition, bacterial strains Bk7 and B4 were able to produce high amounts of IAA and siderophores, and colonize the rice plant roots, while, only strain Bk7 exhibited the capability to form biofilm and solubilize inorganic phosphate. This study indicated that the BB and BBSB bio-formulations can be used to confer induced systematic tolerance and improve the health of rice plants in chilling and drought stress. This article is protected by copyright. All rights reserved.
Journal Plant Biol (Stuttg)
Country China
Volume
Pages
Year 2015
PubMed ID 26681628
PubMed Central ID -
DOI 10.1111/plb.12427
URL -
Relation
Gene CDPK7 CNGC2 CNGC5 CNGC8 DREB1A GOLS1 NAC6 WRKY11 _ _
INSD -
Strain Wild Core Collection -
Induced Mutation Lines(NIG Collection) -
Sterile Seed Strain -
Lethal Embryo
Mutantion Strain
-
Stages in Each Organ
- Muant Lines (Gene)
-
Cultivated Varieties(NIG Collection) -
Stages in Each Organ -
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