Screening of Rice Endophytic Biofertilizers with Fungicide Tolerance and Plant Growth-Promoting Characteristics

Fo-Ting Shen, Jui-Hung Yen, Chien-Sen Liao, Wen-Ching Chen and Yi-Ting Chao
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Fo-Ting Shen: Department of Soil and Environmental Sciences, National Chung-Hsing University, Taichung 40227, Taiwan
Jui-Hung Yen: Department of Agricultural Chemistry, National Taiwan University, Taipei 10617, Taiwan
Chien-Sen Liao: Department of Civil and Ecological Engineering, I-Shou University, Kaohsiung 84001, Taiwan
Wen-Ching Chen: International Bachelor Program of Agribusiness, National Chung-Hsing University, Taichung 40227, Taiwan
Yi-Ting Chao: International Bachelor Program of Agribusiness, National Chung-Hsing University, Taichung 40227, Taiwan

Sustainability, 2019, vol. 11, issue 4, 1-13

Abstract: The application of pesticides is unavoidable in conventional agricultural practice. To develop effective biofertilizers, bacterial strains with both pesticide tolerance and plant growth-promoting (PGP) traits were isolated for further testing. Seedlings of rice ( Oryza sativa ) were planted in soil with 1, 5, or 10 times the recommended rates of the fungicides etridiazole, metalaxyl, and tricyclazole. Endophytic bacteria were isolated from roots of rice seedlings. The bacterial 16S rDNA sequences and related PGP characteristics including potential nitrogen fixation, phosphorus-solubilizing and indole acetic acid (IAA) production ability were further examined. In all, 17 different strains were obtained from rice seedling roots; five strains with both nitrogen fixation potential and IAA production ability included Rhizobium larrymoorei E2, Bacillus aryabhattai E7, Bacillus aryabhattai MN1, Pseudomonas granadensis T6, and Bacillus fortis T9. Except for T9, all strains could tolerate two or more fungicides. We inoculated rice roots with the endophytic bacteria and all conferred rice growth-promoting ability. Bacillus aryabhattai MN1 was further tested and showed high tryptophan dose-dependent IAA production ability, tolerance towards etridiazole and metalaxyl application and should be considered a potential bacterial biofertilizer.

Keywords: endophyte; plant growth promoting; fungicide; indoleacetic acid; Oryza sativa (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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