Subtopic Deep Dive

Strigolactone Effects on Shoot Branching
Research Guide

What is Strigolactone Effects on Shoot Branching?

Strigolactones inhibit shoot branching in plants by modulating auxin transport and interacting with cytokinin signaling, as demonstrated in mutants like d14 and max.

This subtopic examines how strigolactones (SLs) regulate axillary bud outgrowth through hormonal crosstalk. Key studies use rice d14 mutants (Arite et al., 2009, 635 citations) and pea PsBRC1 (Braun et al., 2011, 450 citations) to show SLs act downstream of auxin. Over 10 high-citation papers (2009-2018) detail SL biosynthesis genes like DWARF27 (Lin et al., 2009, 632 citations) and transport mechanisms (Kohlen et al., 2010, 490 citations).

Curated Papers

Key Challenges

Why It Matters

Strigolactone-mediated branching control enables breeding of high-tillering rice varieties for increased grain yield, as shown in DWARF27 mutants (Lin et al., 2009). SL-auxin antagonism (Brewer et al., 2009) informs crop architecture optimization under phosphate deficiency (Kohlen et al., 2010). PsBRC1 downregulation by SLs (Braun et al., 2011) provides targets for engineering ideal shoot patterns in cereals, enhancing productivity in agriculture.

Key Research Challenges

SL-Auxin Transport Mechanisms

Unclear how SLs rapidly deplete PIN1 from bud plasma membranes to inhibit outgrowth (Shinohara et al., 2013). Mutants like max show disrupted auxin flux but exact signaling steps remain unresolved. Quantifying transport dynamics in vivo poses technical hurdles.

Cytokinin-SL Antagonism

SLs counteract cytokinin promotion of bud outgrowth, but interaction sites need clarification (Dun et al., 2011). d14 mutants exhibit excessive tillering despite cytokinin changes. Dissecting dual hormone roles requires precise temporal assays.

Mutant Phenotype Variability

Rice d14 and DWARF27 mutants vary in tiller response under stress (Arite et al., 2009; Lin et al., 2009). Environmental factors like phosphate alter SL effects (Kohlen et al., 2010). Standardizing mutant analyses across species challenges reproducibility.

Essential Papers

Genetic Regulation of Shoot Architecture

Bing Wang, Steven M. Smith, Jiayang Li · 2018 · Annual Review of Plant Biology · 747 citations

Shoot architecture is determined by the organization and activities of apical, axillary, intercalary, secondary, and inflorescence meristems and by the subsequent development of stems, leaves, shoo...

Strigolactone Signaling and Evolution

Mark T. Waters, Caroline Gutjahr, Tom Bennett et al. · 2017 · Annual Review of Plant Biology · 637 citations

Strigolactones are a structurally diverse class of plant hormones that control many aspects of shoot and root growth. Strigolactones are also exuded by plants into the rhizosphere, where they promo...

d14, a Strigolactone-Insensitive Mutant of Rice, Shows an Accelerated Outgrowth of Tillers

Tomotsugu Arite, Mikihisa Umehara, Shinji Ishikawa et al. · 2009 · Plant and Cell Physiology · 635 citations

Recent studies using highly branched mutants of pea, Arabidopsis and rice have demonstrated that strigolactones, a group of terpenoid lactones, act as a new hormone class, or its biosynthetic precu...

DWARF27, an Iron-Containing Protein Required for the Biosynthesis of Strigolactones, Regulates Rice Tiller Bud Outgrowth

Hao Lin, Renxiao Wang, Qian Qian et al. · 2009 · The Plant Cell · 632 citations

Abstract Tillering in rice (Oryza sativa) is one of the most important agronomic traits that determine grain yields. Previous studies on rice tillering mutants have shown that the outgrowth of till...

Strigolactones Are Transported through the Xylem and Play a Key Role in Shoot Architectural Response to Phosphate Deficiency in Nonarbuscular Mycorrhizal Host Arabidopsis

Wouter Kohlen, Tatsiana Charnikhova, Qing Liu et al. · 2010 · PLANT PHYSIOLOGY · 490 citations

Abstract The biosynthesis of the recently identified novel class of plant hormones, strigolactones, is up-regulated upon phosphate deficiency in many plant species. It is generally accepted that th...

Antagonistic Action of Strigolactone and Cytokinin in Bud Outgrowth Control

Elizabeth A. Dun, Alexandre de Saint Germain, Catherine Rameau et al. · 2011 · PLANT PHYSIOLOGY · 460 citations

Abstract Cytokinin (CK) has long been implicated as a promoter of bud outgrowth in plants, but exactly how this is achieved in coordination with other plant hormones is unclear. The recent discover...

The Pea TCP Transcription Factor PsBRC1 Acts Downstream of Strigolactones to Control Shoot Branching

Nils Braun, Alexandre de Saint Germain, Jean‐Paul Pillot et al. · 2011 · PLANT PHYSIOLOGY · 450 citations

Abstract The function of PsBRC1, the pea (Pisum sativum) homolog of the maize (Zea mays) TEOSINTE BRANCHED1 and the Arabidopsis (Arabidopsis thaliana) BRANCHED1 (AtBRC1) genes, was investigated. Th...

Reading Guide

Foundational Papers

Start with Arite et al. (2009) for d14 mutant discovery and Lin et al. (2009) for DWARF27 biosynthesis, establishing SL as branching inhibitors in rice; add Brewer et al. (2009) for auxin upstream role.

Recent Advances

Study Waters et al. (2017, 637 citations) for SL signaling evolution and Wang et al. (2018, 747 citations) for integrated shoot architecture regulation.

Core Methods

Mutant screens (d14, max), GR24 applications, PIN1-GFP imaging, qPCR for PsBRC1, radiolabel transport assays.

How PapersFlow Helps You Research Strigolactone Effects on Shoot Branching

Discover & Search

Research Agent uses citationGraph on Arite et al. (2009) to map 635-citation cluster of SL mutants, then findSimilarPapers reveals DWARF27 links (Lin et al., 2009). exaSearch queries 'strigolactone PIN1 depletion rice pea' for 428-citation Shinohara et al. (2013) and downstream works.

Analyze & Verify

Analysis Agent runs readPaperContent on Kohlen et al. (2010) to extract xylem transport data, then verifyResponse with CoVe cross-checks SL-phosphate claims against Dun et al. (2011). runPythonAnalysis plots tiller outgrowth stats from d14 mutant figures using pandas, with GRADE scoring evidence strength for hormonal crosstalk.

Synthesize & Write

Synthesis Agent detects gaps in SL-cytokinin models from Braun et al. (2011) and Waters et al. (2017), flagging contradictions in bud repression. Writing Agent applies latexEditText to revise branching diagrams, latexSyncCitations for 10-paper bibliography, and latexCompile for publication-ready review; exportMermaid visualizes auxin-SL pathways.

Use Cases

"Extract tiller outgrowth data from d14 and DWARF27 rice mutants for meta-analysis"

Research Agent → searchPapers 'd14 DWARF27 rice tillering' → Analysis Agent → readPaperContent (Arite 2009, Lin 2009) → runPythonAnalysis (pandas meta-analysis of bud lengths, matplotlib plots) → CSV export of quantified phenotypes.

"Write LaTeX review on SL inhibition of pea shoot branching with PsBRC1 focus"

Synthesis Agent → gap detection across Braun 2011 + Brewer 2009 → Writing Agent → latexGenerateFigure (branching diagram) → latexSyncCitations (450+ papers) → latexCompile → PDF with integrated tiller mutant schematics.

"Find GitHub code for modeling strigolactone auxin transport in Arabidopsis"

Research Agent → searchPapers 'strigolactone PIN1 model' (Shinohara 2013) → Code Discovery → paperExtractUrls → paperFindGithubRepo → githubRepoInspect → Python scripts for PIN1 depletion simulations.

Automated Workflows

Deep Research workflow scans 50+ SL papers via searchPapers on 'strigolactone shoot branching mutants', chains citationGraph → DeepScan 7-step verification on Arite (2009) and Lin (2009) abstracts → structured report with tiller yield impacts. Theorizer generates hypotheses on SL-phosphate-xylem links from Kohlen (2010), testing via runPythonAnalysis simulations. DeepScan applies CoVe checkpoints to validate cytokinin antagonism in Dun (2011).

Try Doxa for Strigolactone Effects on Shoot Branching Research

Frequently Asked Questions

What defines strigolactone effects on shoot branching?

Strigolactones inhibit axillary bud outgrowth by acting downstream of auxin and upstream of PsBRC1, as shown in rice d14 (Arite et al., 2009) and pea mutants (Braun et al., 2011).

What methods study SL branching control?

Researchers use max/d14 mutants, GR24 SL analogs, and PIN1 localization assays; xylem transport tracked via radiolabeled SLs (Kohlen et al., 2010; Shinohara et al., 2013).

What are key papers on this topic?

Arite et al. (2009, 635 citations) identifies d14; Lin et al. (2009, 632 citations) details DWARF27; Braun et al. (2011, 450 citations) positions PsBRC1 downstream.

What open problems exist?

Precise SL-PIN1 depletion kinetics, cytokinin interaction nodes (Dun et al., 2011), and field performance of mutants under varying phosphate remain unresolved.