Lessons complete0/10
0% complete
THC Living Plant Atlas system
Seed & Germination
Achene and true-seed anatomy, imbibition, reserve mobilization, radicle emergence, cotyledon establishment, thermal response, water potential, salinity, vigor, aging, storage, pericarp effects, priming, and failure patterns.
10 structured lessons6 learning goals16 indexed topics
System progress
Open dashboardKeep this system connected to your Atlas record.
Knowledge mastered0/10
0% mastered
Next unfinished lessonSeed anatomy
Continue learningConnected biology
This system does not work alone.
Early establishment links seed hydration, root emergence, vascular continuity, cotyledon function, and environmental conditions.
Follow the connection
Root SystemRoot architecture, root-tip growth zones, lateral-root initiation, root hairs, rhizosphere exchange, radial water transport, aquaporins, oxygen availability, water and nutrient uptake, microbiomes, exudates, mycorrhizal interfaces, and root stress.Stem & Vascular SystemStem anatomy, support, xylem, phloem, vascular cambium, secondary growth, transport, source-sink allocation, internodal spacing, hydraulics, damage response, and recovery.LeavesLeaf tissue anatomy, morphogenesis, leaflet complexity, photosynthesis, stomata, transpiration, leaf age, energy balance, inspection, and observation-first symptom interpretation.Environment OverlayCoupled whole-plant environment overlay for PPFD, DLI, photoperiod, CO2, temperature, humidity, VPD, airflow, leaf energy balance, canopy light acclimation, water, root-zone supply, nutrients, pH, EC, and interacting limitations.
Developmental context
Measure or record with it
- Media moisture
- Root-zone temperature
- Time to radicle emergence
- Seedling establishment rate
Interactive visual lab
Seed-to-Seedling Sequence Lab
Germination is a developmental sequence driven by hydration, metabolism, embryo growth, and emergence. Stage is more informative than elapsed time alone.
Developmental stage
Dry seed
Visible
Intact seed coat; no radicle visible.
Biology
The mature seed is metabolically quiet compared with active germination. Viability depends on embryo condition and storage history.
ObserveSeed coat integrity, storage history, obvious damage or mold.
Learning objectives
What this system should teach
Visual curriculum
Seed & Germination lesson sequence
Each lesson is structured around a visual reference so the Atlas can replace dry text-first learning with observation and diagrams.Lesson 01
Seed anatomy
Distinguish the whole cannabis achene from the true seed and locate the pericarp, seed coat, residual peripheral endosperm, cotyledons, radicle, hypocotyl region, and plumule.
Open visual lessonAchene and true-seed longitudinal cutaway
Lesson 02
Imbibition
See how water uptake rehydrates seed tissues and restarts metabolic activity before visible germination.
Open visual lessonHydration sequence diagram
Lesson 03
Radicle emergence
Follow the radicle as the first root organ emerges and establishes the direction of early seedling growth.
Open visual lessonTime-sequence germination strip
Lesson 04
Cotyledon transition
Track emergence from the seed shell through cotyledon opening and the first true leaves.
Open visual lessonSeedling transition timeline
Lesson 05
Germination failure patterns
Compare stalled seeds, damping-off risk, shell retention, excessive moisture, and temperature-related delays without assuming one cause from appearance alone.
Open visual lessonFailure-pattern comparison card
Lesson 06
Reserve mobilization
Follow stored lipids, proteins, and other seed reserves as germination restarts metabolism and supports embryo growth before expanding leaves become the dominant current carbon source.
Open visual lessonSeed reserve mobilization cutaway and flow map
Lesson 07
Thermal limits & germination rate
Separate final germination percentage from the speed of germination, then use hemp seed studies to show how temperature can alter both while keeping published cardinal-temperature estimates specific to the tested cultivar, seed lot, and method.
Open visual lessonTemperature-response curve with germination percentage and rate separated
Lesson 08
Water potential, salinity & osmotic stress
Trace how reduced external water potential and dissolved salts can slow or suppress water uptake and emergence, while recognizing genotype, seed lot, salt composition, and experimental conditions as important sources of variation.
Open visual lessonSeed-to-radicle water-potential and salinity stress sequence
Lesson 09
Seed vigor, aging & storage
Distinguish viability from vigor and connect storage time, seed moisture, temperature, dockage or contamination, and initial seed-lot quality to later germination performance instead of assigning one universal storage lifespan.
Open visual lessonSeed storage condition to vigor-loss matrix
Lesson 10
Pericarp resistance, priming & low-vigor germination
Compare intact and experimentally altered achenes to understand how the pericarp can contribute to poor emergence in some low-germinating lots and how priming may change speed or uniformity without being presented as a guaranteed treatment for every seed lot.
Open visual lessonIntact pericarp, pericarp-removal, and priming comparison workflow
Reference index
Topics connected to this system
Seed anatomyAchene pericarpImbibitionReserve mobilizationRadicle emergenceCotyledonsGermination rateThermal responseWater potentialSalinitySeed vigorSeed agingSeed storagePericarp resistancePrimingGermination failures