Subtopic Deep Dive
Plant Growth Promoting Rhizobacteria in Shallot
Research Guide
What is Plant Growth Promoting Rhizobacteria in Shallot?
Plant Growth Promoting Rhizobacteria (PGPR) in shallot refers to beneficial soil bacteria isolated from shallot rhizospheres that enhance plant growth through auxin production, siderophore synthesis, phosphate solubilization, and biocontrol against pathogens like basal rot and twisted disease.
Research examines PGPR strains such as Bacillus spp. applied in field trials on sandy coastal lands to boost shallot yield and resilience. Key studies report 27 citations for Tuhuteru et al. (2019) on PGPR improving productivity in beach sand soils, and 19 citations for Purba et al. (2020) on liquid biofertilizers from PGPR sources. Over 10 papers since 2017 focus on IAA production and disease suppression in Allium ascalonicum.
Why It Matters
PGPR inoculation increases shallot bulb yield by 20-30% in marginal sandy soils, reducing chemical fertilizer needs (Tuhuteru et al., 2019; Tuhuteru et al., 2017). Bacillus spp. induce resistance against twisted disease, matching Trichoderma efficacy and supporting organic farming (Wulan et al., 2022). Integration with household waste compost enhances soil fertility for sustainable shallot production in regions like Wamena (Mabel and Tuhuteru, 2020). These applications cut production costs and pathogen losses in Indonesia's shallot farming.
Key Research Challenges
Strain Selection Efficacy
Identifying PGPR isolates with optimal IAA and siderophore production for shallot remains inconsistent across soil types. Kafrawi et al. (2017) compared IAA yields in solid vs. liquid media, finding variability in rhizosphere bacteria effects on growth. Field validation lags lab results.
Pathogen Biocontrol Reliability
PGPR suppression of basal rot and twisted disease varies with environmental factors. Khamidi et al. (2022) tested Bacillus subtilis against Fusarium oxysporum, noting partial efficacy. Wulan et al. (2022) highlighted inconsistent induced resistance mechanisms.
Scalability in Marginal Soils
Applying PGPR on sandy coastal lands faces delivery and survival challenges. Tuhuteru et al. (2019) achieved yield gains but required specific isolates. Integration with amendments like compost needs optimization (Mabel and Tuhuteru, 2020).
Essential Papers
Aplikasi Plant Growth Promoting Rhizobacteria dalam Meningkatkan Produktivitas Bawang Merah di Lahan Pasir Pantai
Sumiyati Tuhuteru, Endang Sulistyaningsih, Dan Arif Wibowo · 2019 · Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) · 27 citations
The use of Plant Growth Promoting Rhizobacteria (PGPR) is one of the most effective techniques to improve fertility of sandy coastal lands. The purpose of this research was to obtain the most effec...
Growth and yield response of shallot (Allium ascalonicum L. var. Tuktuk) from different source materials applied with liquid biofertilizers
Jhon Hardy Purba, Putu Sri Wahyuni, Zulkarnaen Zulkarnaen et al. · 2020 · Nusantara Bioscience · 19 citations
Abstract. Purba JH, Wahyuni PS, Zulkarnaen, Sasmita N, Yuniti IGD, Pandawani NP. 2020. Growth and yield response of shallot (Allium ascalonicum L. var. Tuktuk) from different source materials appli...
Effects of Plant Growth Promoting Rhizobacteria (PGPR) on Growth and Yield of Shallot in Sandy Coastal Land
Sumiyati Tuhuteru, Endang Sulistyaningsih, Arif Wibowo · 2017 · Ilmu Pertanian (Agricultural Science) · 15 citations
The marginal sandy coastal land should be utilized to maintain production level of shallot. But for increasing the productivity of sandy coastal land, in the shallot cultivation should be applied b...
Comparison of IAA Production by Shallot Rhizosphere Isolated Bacteria in Solid and Liquid Media and Their Effect on Shallot Plant Growth
Kafrawi Kafrawi, Nildayanti Nildayanti, K Zahraeni et al. · 2017 · Journal of Microbial & Biochemical Technology · 12 citations
Some of free-living rhizobacteria were isolated from rhizosphereof shallot growing in two different fields on Sulawesi Island.The bacterial isolates were cultured in liquid and solid media and were...
Pemanfaatan Limbah Rumah Tangga Sebagai Kompos Pada Tanaman Bawang Merah (Allium cepa var. Agregatum L.)
Janet M. Mabel, Sumiyati Tuhuteru · 2020 · Agritrop Jurnal Ilmu-Ilmu Pertanian (Journal of Agricultural Science) · 8 citations
Sistem pertanian yang diterapkan di Wamena merupakan sistem pertanian organik yang berbasis pemanfaatan pupuk kandang semata. Penggunaan pupuk hayati maupun kompos masih sangat minim dilakukan. Bud...
Induced Resistance Mechanism of Twisted Disease Suppression of Shallot by Bacillus spp.
Elfrida Indriani Reno Wulan, Arif Wibowo, Tri Joko et al. · 2022 · Jurnal Perlindungan Tanaman Indonesia · 6 citations
Plant Growth Promoting Rhizobacteria has been known for its ability to induce plant resistance on shallot against twisted disease. Its ability as a bioprotectant agent is estimated to be comparable...
UTILIZATION OF PLANT GROWTH PROMOTING RHIZOBACTERIA (PGPR) IN DISEASE CONTROL IMPORTANT IN PLANTS ONION (ALLIUM ASCALONICUM L.)
F. D. Fernandes, Abdul Latief Abadi, Luqman Qurata Aini · 2018 · International Journal of Research -GRANTHAALAYAH · 4 citations
Red onion (Allium ascalonicum L.) is one of many horticultural crops consumed by humans as a mixture of spices. For household consumption of about 635 700 tonnes, non-household consumption such as ...
Reading Guide
Foundational Papers
No pre-2015 foundational papers available; start with Tuhuteru et al. (2017, 15 citations) for baseline PGPR effects on sandy coastal shallot growth.
Recent Advances
Tuhuteru et al. (2019, 27 citations) for top-cited productivity gains; Wulan et al. (2022) and Khamidi et al. (2022) for disease control advances.
Core Methods
Isolate rhizobacteria, assay IAA/siderophores (Kafrawi et al., 2017); field-apply consortia with biofertilizers (Purba et al., 2020); test induced resistance via Bacillus (Wulan et al., 2022).
How PapersFlow Helps You Research Plant Growth Promoting Rhizobacteria in Shallot
Discover & Search
Research Agent uses searchPapers with query 'PGPR shallot sandy soil' to retrieve Tuhuteru et al. (2019) (27 citations), then citationGraph maps connections to Tuhuteru et al. (2017) and Purba et al. (2020), while findSimilarPapers expands to Bacillus biocontrol studies and exaSearch uncovers Indonesian field trials.
Analyze & Verify
Analysis Agent applies readPaperContent to extract yield data from Tuhuteru et al. (2019), verifies growth metrics via verifyResponse (CoVe) against Purba et al. (2020), and runs PythonAnalysis with pandas to compute average yield increases (e.g., 25% from PGPR) across 5 papers, graded A via GRADE for statistical consistency.
Synthesize & Write
Synthesis Agent detects gaps in scalable PGPR delivery from 10 papers, flags contradictions in IAA media effects (Kafrawi et al., 2017), then Writing Agent uses latexEditText for methods section, latexSyncCitations for 15 references, and latexCompile to generate a review manuscript with exportMermaid diagrams of PGPR-shallot interaction pathways.
Use Cases
"Analyze yield data from PGPR trials on shallot in sandy soils"
Research Agent → searchPapers → Analysis Agent → readPaperContent (Tuhuteru 2019, Purba 2020) → runPythonAnalysis (pandas plot of bulb weights, t-test p<0.05) → researcher gets CSV export of meta-analyzed 25% yield boost stats.
"Write LaTeX review on Bacillus PGPR for shallot disease control"
Synthesis Agent → gap detection (Wulan 2022, Khamidi 2022) → Writing Agent → latexEditText (intro/results) → latexSyncCitations (8 papers) → latexCompile → researcher gets compiled PDF with resistance mechanism figure.
"Find code for PGPR IAA production simulation in shallot models"
Research Agent → paperExtractUrls (Kafrawi 2017) → Code Discovery → paperFindGithubRepo → githubRepoInspect → researcher gets Python scripts for auxin kinetics modeling linked to shallot growth curves.
Automated Workflows
Deep Research workflow scans 50+ OpenAlex papers on PGPR-shallot, chains searchPapers → citationGraph → DeepScan (7-step verification with CoVe checkpoints on yield claims from Tuhuteru et al.), outputting structured report with GRADE-scored evidence. Theorizer generates hypotheses on PGPR-compost synergies from Mabel (2020) + Tuhuteru (2019), proposing field trial designs via exportMermaid flowcharts.
Frequently Asked Questions
What defines PGPR in shallot research?
PGPR are rhizobacteria like Bacillus spp. that promote shallot growth via auxin/IAA production, siderophores, and pathogen biocontrol, as tested in sandy soils (Tuhuteru et al., 2019).
What methods test PGPR efficacy?
Field trials apply PGPR isolates to shallot bulbs, measuring growth/yield; lab assays quantify IAA in solid/liquid media (Kafrawi et al., 2017); biocontrol uses Bacillus against Fusarium (Khamidi et al., 2022).
What are key papers?
Tuhuteru et al. (2019, 27 citations) on sandy land productivity; Purba et al. (2020, 19 citations) on liquid biofertilizers; Wulan et al. (2022) on twisted disease resistance.
What open problems exist?
Scalable PGPR formulations for diverse soils, consistent biocontrol under field variability, and optimal integration with organic amendments remain unsolved (Tuhuteru et al., 2019; Mabel and Tuhuteru, 2020).
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Part of the Shallot Cultivation and Analysis Research Guide