Brassica napus
Enable an AI agent to recognise Brassica napus, assess its development and condition, and determine evidence-supported options for cultivation, propagation, harvest or containment.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex + Grok
Purpose and description
Enable an AI agent to recognise Brassica napus, assess its development and condition, and determine evidence-supported options for cultivation, propagation, harvest or containment.
Brassica napus is an amphidiploid crucifer (AACC genome, 2n=38) formed by hybridisation of Brassica rapa (AA) and Brassica oleracea (CC), and is the cultivated species that includes oilseed rape/canola, forage rape, leaf rape, and the swollen-hypocotyl vegetable swede/rutabaga.
It can be Identify or sample a suspected B. napus plant and retain unresolved alternatives.; Select planting or propagation material using cultivar, viability and seasonal-growth evidence.; Monitor development and diagnose abnormal growth before choosing an intervention.; Assess flowering overlap and organise controlled pollination or reproductive isolation.; Assess the intended harvest organ and direct it to an evidence-supported use.; Locate volunteers, assess reproductive status and choose an authorised containment action..
Distinguishing features
Against B. rapa, examine upper stem leaves: partial clasping and a bluish, waxy appearance support B. napus; use several characters together. [CFIA botanical description](https://inspection.canada.ca/en/plant-health/plant-varieties/novel-traits/applicants/directive-94-08/biology-documents/brassica-napus)
Against flowering B. rapa, inspect the raceme: unopened buds above open flowers support B. napus. [CFIA botanical description](https://inspection.canada.ca/en/plant-health/plant-varieties/novel-traits/applicants/directive-94-08/biology-documents/brassica-napus)
For ambiguous material, test genomic identity: typical B. napus has AACC constitution and 2n=38, distinguishing it from its diploid progenitors and B. juncea; chromosome count alone cannot exclude unusual hybrids. [CFIA genetics](https://inspection.canada.ca/en/plant-health/plant-varieties/novel-traits/applicants/directive-94-08/biology-documents/brassica-napus)
Check botanical evidence behind crop labels: canola can belong to multiple species, while rutabaga and some leafy forms belong within B. napus; neither an oilseed label nor a swollen root establishes species. [CFIA identity](https://inspection.canada.ca/en/plant-health/plant-varieties/novel-traits/applicants/directive-94-08/biology-documents/brassica-napus)
Scope
+ Species identification, including ambiguous specimens and suspected hybrids
+ Cultivar identity and oilseed, root, leafy or forage form
+ Establishment, vegetative growth, flowering and reproductive maturity
+ Plant condition, stress symptoms and diagnostic evidence
+ Reproductive compatibility, seed release and volunteer establishment
+ Biological suitability of particular organs for intended harvest or propagation
- Independent models of Brassica rapa, Brassica oleracea and other neighbouring taxa
- Field, soil and weather systems, except their measured effects on the plant
- Pathogen and pest biology, except observed host interactions
- Processed oil, meal, food and feed products and their manufacturing processes
- Commodity lot logistics, certification and market grading
- Farm operations, pesticide authorisations and land-management policies
Characteristics
- Species determination
- unexamined | provisional | supported | conflicting Controls whether B. napus-specific decisions are justified.
- Cultivar and parentage
- Named cultivar, accession or parental records, with evidence and confidence Connects claimed traits to the actual plant rather than its common name.
- Crop form
- oilseed | swollen-root | leafy | forage | other | unresolved Determines which organs and developmental outcomes matter.
- Seasonal growth habit
- spring | winter | intermediate | unresolved; retain supplier terminology Frames expectations for establishment and flowering.
- Developmental stage
- Declared staging system and version, stage code, observation date and organ Supports stage-dependent sampling and intervention.
- Cold exposure
- Temperature in degrees Celsius over time; any accumulated exposure must declare its calculation Helps evaluate flowering readiness against cultivar-specific requirements.
- Affected plant fraction
- Percent of a defined sample, separated by symptom and organ Distinguishes isolated injury from a population-level problem.
- Pollen fertility
- fertile | male-sterile | partially fertile | untested, with assay or pedigree evidence Supports propagation and pollen-source decisions.
- Seed maturity and moisture
- Percent seed colour change and percent moisture on a stated basis, sampled by plant position Supports harvest assessment without treating all pods as equally mature.
- Harvest-organ composition
- Analyte, organ and assay basis; oil percent dry mass, erucic acid percent total fatty acids, glucosinolates in micromoles per gram of specified material Tests suitability for the intended use without inferring quality from species identity.
- Resistance or tolerance evidence
- Trait linked to a named herbicide, pathogen or stress, evidence source and applicable conditions Prevents unsupported assumptions about treatment response.
- Occurrence status
- sown | volunteer | feral | unresolved, with location and observation date Distinguishes intended production from unwanted persistence.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 18 findings · 28 questions.
Species and crop form Establish what Brassica material is present and which cultivated form it represents.
Common crop names and similar Brassica morphology can otherwise lead to incorrect identification and use.
Species evidence
Combine specimen observations with documentary or laboratory support.
Supported napus identification
Record the identification argument, its supporting material and unresolved alternatives.
- Which observed leaf and flowering characters support B. napus over B. rapa or another local Brassica? definition
- Which voucher, expert determination or genomic assay supports the identification, and does any evidence conflict? provenance
Cultivated form
Separate species membership from cultivar and intended harvest organ.
Form and lineage
Record the claimed crop form and cultivar without treating either as a separate species.
- Is this material intended for oilseed, swollen-root, leafy or forage production, and which organ is the target? definition
- What seed, accession or breeding record supports the cultivar and parentage claim? provenance
Establishment and development Track whether the plant is progressing toward its intended vegetative or reproductive outcome.
The meaning of bolting, delayed flowering and maturity depends on seasonal habit and crop form.
Seasonal readiness
Relate establishment and environmental exposure to documented cultivar requirements.
Growth habit fit
Record evidence that the planting history can support the required development.
- What evidence establishes this cultivar's seasonal habit and flowering requirements? provenance
- What emergence date, cold exposure and day-length history have these plants actually experienced? measurement
Organ development
Assess growth by organ and observation scale.
Development relative to use
Interpret rosette growth, bolting, root enlargement and pod development against the intended harvest.
- What developmental stages occur across the sampled plants, branches and target organs? measurement
- Does observed bolting or organ maturity support the intended harvest, or require changing its timing? action
Condition and response Connect organ-level injury and growth limitations to defensible management choices.
Similar visible damage may require different responses, and cultivar claims do not establish the cause of current symptoms.
Host diagnostics
Describe symptoms before assigning pest, pathogen or environmental causes.
Injury and causal evidence
Keep observed root, stem, leaf and pod abnormalities separate from diagnostic conclusions.
- What root swellings, stem lesions, leaf feeding or pod damage are present, and how extensive are they? measurement
- Which tests support or exclude suspected clubroot, blackleg, Sclerotinia, insect injury or abiotic stress? provenance
Intervention fit
Evaluate proposed responses against cultivar evidence, stage and local conditions.
Supported management response
Record what supports intervention and what requires further diagnosis.
- What measured water or nutrient limitation, or confirmed damaging organism, is the proposed intervention addressing? measurement
- Does the proposed action fit this cultivar's documented traits, developmental stage and linked local authorisation? action
Reproduction and persistence Assess pollen contribution, seed production and establishment beyond the intended planting.
Propagation decisions must account for parentage, nearby compatible material and the fate of released seed.
Pollination context
Record fertility and potential pollen exchange for the observed planting.
Pollen and parentage control
Identify the reproductive evidence needed for seed production or isolation.
- What evidence establishes pollen fertility or a claimed male-sterility and fertility-restoration system? provenance
- Which nearby B. napus or potentially compatible Brassica populations overlap in flowering, and what isolation is justified? action
Seed escape and return
Track released seed and subsequent plants without assuming their origin.
Volunteer establishment
Connect seed-loss observations to monitoring and control of later emergence.
- How much seed release or spillage was observed, where did it occur, and what later emergence was measured? measurement
- Should these volunteers be retained, sampled or removed before reproduction, considering their identity and documented tolerance traits? action
Harvest and use suitability Determine whether the intended organ is ready and supported for its proposed destination.
Species identity alone does not establish harvest readiness, canola quality or suitability of roots and foliage.
Harvest readiness
Evaluate the target organ rather than imposing oilseed criteria on every crop form.
Organ-specific harvest decision
Record maturity evidence and the consequences of harvesting or waiting.
- For the intended organ, what seed moisture and colour change, root dimensions or leaf condition have been measured? measurement
- Do those observations support harvest now, considering uneven maturity, pod opening or declining organ quality? action
Destination evidence
Separate proposed use from analytically demonstrated suitability.
Composition-supported use
Link representative organ samples to composition results and the destination's acceptance criteria.
- Which representative assays establish relevant oil content, erucic acid, glucosinolates or other destination-specific properties? measurement
- Which linked specification determines acceptance for the proposed use, and what remains untested? boundary
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Winter oilseed rape (autumn-sown, vernalisation-requiring rapeseed)
- Spring oilseed rape / spring canola
- Canola / double-low (00) types: low erucic acid in the oil and low glucosinolates in the meal
- High-erucic-acid rapeseed (HEAR) grown for industrial oils rather than food
- Swede / rutabaga (B. napus subsp. rapifera / var. napobrassica)
- Leaf rape / Siberian kale / Hanover kale (var. pabularia)
- Forage rape used for grazing, silage or cover cropping
- Specialty fatty-acid cultivars (high-oleic and related oil-profile types)
- Which of these kinds and varieties hold for the sense of Brassica napus this model covers, and on what evidence? provenance
Identifiers and schemes
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Wikidata - Q177932 - Item for Brassica napus L.
- NCBI Taxonomy - 3708 - taxid for Brassica napus
- ITIS TSN - 23059 - Taxonomic Serial Number for Brassica napus
- EPPO Code - BRSNN - Plant-protection code for Brassica napus
- USDA PLANTS - BRNA - PLANTS symbol for Brassica napus
- Scientific name (Linnaean) - Brassica napus L. - Sp. Pl. 2: 666 (1753); the botanical species, not the canola quality class
- Harmonized System - 1205 - Heading for rapeseed or colza seeds; low-erucic seed is often split as 1205.10
- Which of these identifiers and schemes hold for the sense of Brassica napus this model covers, and on what evidence? provenance
Standards and regulation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Codex Alimentarius CXS 210-1999 Standard for Named Vegetable Oils (FAO/WHO Codex Alimentarius Commission) - compositional identity of rapeseed oil and low-erucic-acid rapeseed (canola) oil
- ISO 9167 Rapeseed - Determination of glucosinolate content (International Organization for Standardization)
- UPOV TG/36 DUS Test Guidelines for rape seed (International Union for the Protection of New Varieties of Plants)
- OECD Seed Schemes for the Varietal Certification of Crucifer and other Oil or Fibre Species Seed (OECD)
- ISTA International Rules for Seed Testing (International Seed Testing Association)
- Canola quality definition used by the Canola Council of Canada and applied in Canadian grain/seed regulation: <2% erucic acid in the oil and <30 µmol glucosinolates/g air-dried oil-free meal
- Commission Regulation (EU) 2019/1870 amending Regulation (EC) No 1881/2006 - maximum levels of erucic acid in vegetable oils, foods and infant formula (European Commission)
- USDA Agricultural Marketing Service canola grade standards (United States Department of Agriculture)
- Which of these standards and regulation hold for the sense of Brassica napus this model covers, and on what evidence? provenance
Real-world use
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Crushed for edible oil sold as rapeseed oil in Europe and as canola oil in Canada, the United States and Australia
- High-erucic cultivars crushed for industrial oils, erucamide plastics slip agents and other oleochemicals
- Major European biodiesel feedstock as rapeseed methyl ester (RME)
- Defatted meal used as a protein feed for cattle, pigs and poultry, subject to glucosinolate limits
- Swede/rutabaga grown as a root vegetable; leaf rape grown as a leafy green
- Forage and cover-crop rape in livestock and arable rotations, and as a break crop before cereals
- Mass flowering used as a nectar and pollen source for bees, and as a landscape crop in temperate farming regions
- Which of these real-world use hold for the sense of Brassica napus this model covers, and on what evidence? provenance
Typical measurements
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Seed oil content - 40-48 - % of seed dry mass
- Erucic acid in the oil (C22:1) - canola/00: <2; traditional/HEAR: about 40-55 - % of total fatty acids
- Glucosinolates in defatted meal - canola: <30; older high-glucosinolate types often 60-150 - µmol/g air-dried oil-free meal
- Thousand-seed mass - 3.5-6.5 - g
- Farm seed yield (temperate oilseed crops) - 2-4.5 - t/ha
- Somatic chromosome number - 38 - 2n count
- Crude protein in defatted meal - 35-40 - % of meal mass
- Which of these typical measurements hold for the sense of Brassica napus this model covers, and on what evidence? provenance
Failure modes and hazards
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Clubroot (Plasmodiophora brassicae) can make infested fields uneconomic for brassicas for years
- Blackleg (Leptosphaeria maculans) and Sclerotinia stem rot are major yield-reducing diseases of oilseed crops
- Pod shatter before or at harvest spills seed and creates volunteer populations in following crops
- High-erucic oil was withdrawn from food use after animal studies linked it to myocardial lipidosis; food oils are therefore held to low-erucic limits
- High-glucosinolate meal is goitrogenic and unpalatable in livestock, which is why double-low canola/00 types dominate feed markets
- Insect damage from flea beetles, pollen beetles and cabbage seedpod weevil
- Frost or heat at flowering reduces seed set
- Pollen can cause seasonal allergic rhinitis in people living next to large flowering fields
- Feral and volunteer plants, and hybridisation with Brassica rapa, complicate identity preservation and transgenic confinement
- Which of these failure modes and hazards hold for the sense of Brassica napus this model covers, and on what evidence? provenance
Regional variation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Canada, the United States and Australia market double-low B. napus as canola; industrial or high-erucic seed is still called rapeseed
- United Kingdom and Ireland call the oilseed crop oilseed rape (OSR) and the vegetable a swede
- North America calls the same vegetable a rutabaga
- France uses colza; Germany uses Raps or Winterraps for the dominant winter oilseed crop
- India often names B. napus gobhi sarson, while toria and many sarson types are Brassica rapa
- In Chinese farming, 油菜 (youcai) covers B. napus, B. rapa and B. juncea oilseeds; winter B. napus dominates the Yangtze basin
- Northern Europe is dominated by winter types; the Canadian Prairies are almost entirely spring canola
- Which of these regional variation hold for the sense of Brassica napus this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Brassica rapa (turnip rape, Polish canola, many Asian oilseeds and vegetables) - Diploid AA, 2n=20 rather than 38; generally smaller seed and earlier maturity; no C genome. Chromosome count or genome-specific markers separate them; field plants also differ in leaf clasping, beak and silique proportions used in DUS keys.
- Brassica oleracea (cabbage, kale, broccoli and related vegetables) - Diploid CC, 2n=18; usually a vegetable biennial rather than an oilseed. Lacks the A genome and does not form the napus swollen hypocotyl of swede.
- Brassica juncea (brown/oriental mustard) - Allotetraploid AABB, 2n=36; seed is pungent (allyl glucosinolate) and the plant has a mustard rather than rapeseed flavour and silique shape. Chromosome number and glucosinolate profile separate it from napus.
- Brassica carinata (Ethiopian mustard) - Allotetraploid BBCC, 2n=34; typically more heat-tolerant and often higher in erucic acid. Chromosome number and B-genome markers separate it from napus.
- Sinapis alba (white/yellow mustard) - Pale seeds and short, hairy siliques unlike the long dehiscent Brassica silique; different glucosinolate chemistry (sinalbin). Fruit morphology is the field test.
- Raphanus raphanistrum (wild radish) - Fruit is a constricted lomentaceous pod that breaks into bead-like segments, not a two-valved Brassica silique.
- Camelina sativa (false flax / gold-of-pleasure) - Much smaller seed and pear-shaped siliculae rather than long siliques; not a Brassica and has a different oil and glucosinolate profile.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of Brassica napus this model covers, and on what evidence? provenance
Sources
- Species Plantarum, vol. 2 (original publication of Brassica napus L.) - Nomenclatural origin of the species name and the Linnaean circumscription.
- Consensus Document on the Biology of Brassica napus L. (Oilseed Rape) - Allotetraploid origin (U's triangle), 2n=38, crop types, outcrossing and feral/volunteer behaviour used in the definition, neighbours and hazards.
- The Biology of Brassica napus L. (Canola/Rapeseed) - Canadian crop biology, canola quality class versus botanical species, agronomic types and gene-flow context.
- Standard for Named Vegetable Oils (CXS 210-1999) - Codex identity of rapeseed oil and low-erucic-acid rapeseed (canola) oil, including fatty-acid composition limits.
- Official definition of canola - Market definition used in North America: oil with less than 2% erucic acid and meal with less than 30 µmol glucosinolates per gram of air-dried oil-free meal.
- Guidelines for the Conduct of Tests for Distinctness, Uniformity and Stability: Rape Seed (Brassica napus L. oleifera) TG/36 - UPOV distinctness traits that separate oilseed-rape varieties and neighbouring Brassica crops in official testing.
- NCBI Taxonomy Browser: Brassica napus (taxid 3708) - Stable taxonomic identifier 3708 for the species.
- Wikidata item Brassica napus (Q177932) - Crosswalk among taxonomic, bibliographic and identifier schemes for the species.
What the second pass must settle
- Which taxonomic authority and diagnostic protocol should govern difficult specimens, introgressed material and cultivated forms within this registry entry?
- Which cultivar-specific cold-exposure and flowering criteria are validated for the regions where this model will be used?
- Which sampling methods and action thresholds are supported separately for oilseed, swollen-root, leafy and forage forms?
- What local evidence establishes compatible neighbouring populations, appropriate reproductive isolation and the required duration of volunteer monitoring?
- Which destination-specific composition standards and analytical methods should govern use suitability, especially when canola terminology varies between authorities?