The seed multiplication gap: Why better potato genetics still struggle to reach the grower

Potato breeders are producing varieties with improved disease resistance, climate resilience, storability and market quality. Yet across much of the world, the real bottleneck begins after a variety is released: multiplying enough healthy planting material and delivering it to growers at a price they can afford.

By Lukie Pieterse, Editor and Publisher, Potato News Today

A newly released potato variety may have survived more than a decade of crossing, selection, disease screening, field trials and quality evaluation.

It may tolerate heat better than established varieties, resist late blight, require less crop protection, store for longer or produce the shape, dry matter and colour required by processors.

Scientifically, the achievement can be considerable.

Commercially, however, the variety has accomplished very little until sufficient quantities of healthy planting material reach growers.

This is one of the least appreciated limitations on potato innovation.

The international potato sector invests heavily in genetics, breeding, biotechnology and variety trials. Yet it often invests less effectively in the multiplication systems needed to convert a few clean plantlets, minitubers or breeder’s tubers into thousands of tonnes of dependable commercial seed.

Unlike cereals, maize or oilseeds, conventional potatoes are propagated largely through tubers. Those tubers are bulky, perishable and expensive to store and transport. They can also carry viruses, bacteria, fungi, nematodes and physiological problems from one generation to the next.

The result is a crop with an unusually difficult seed system.

In well-developed seed-producing regions, sophisticated certification, testing, multiplication and traceability systems help control these risks. In many emerging production regions, growers continue recycling potatoes from their own harvests or purchasing planting material whose health and identity may be uncertain.

The difference between those systems helps explain some of the enormous yield disparities found across the global potato industry.

The problem is not simply that some growers lack access to improved varieties. They often lack access to healthy, affordable and locally adapted seed of those varieties.

A variety release is the beginning, not the end

The public announcement of a new variety creates the impression that it is ready for widespread use.

In reality, variety release is followed by another lengthy process.

A small quantity of pathogen-tested starting material must be multiplied through controlled environments and field generations. Each stage must produce enough material for the next without allowing disease, varietal mixing or quality decline to undermine the system.

Depending on the country and production method, this progression may include:

Tissue-culture plantlets.
Microtubers or laboratory-produced starting material.
Greenhouse or screenhouse plantlets.
Minitubers produced through soil, substrate, hydroponic or aeroponic systems.
Early-generation field seed.
Foundation or equivalent classes.
Certified commercial seed.
One or more farmer-saved generations.

Every step takes time, land, infrastructure, testing and technical competence.

A breeder may identify an exceptional clone, but the multiplication rate of tubers is relatively low compared with crops propagated through botanical seed. One potato plant produces a limited number of daughter tubers suitable for further multiplication.

This creates a mathematical bottleneck. Moving from a few pathogen-tested plantlets to enough seed for thousands of commercial hectares cannot happen in one season.

If multiplication begins only after the variety has completed every regulatory and market-acceptance stage, several additional years may pass before growers can obtain meaningful volumes.

The seed tuber carries opportunity—and risk

A seed potato is both planting material and a living biological package.

It contains stored energy that supports early crop establishment. It also carries the genetic identity of the parent plant, allowing a successful commercial variety to be reproduced clonally.

But the same biological continuity allows diseases to move through generations.

Viruses such as potato virus Y may accumulate when infected tubers are replanted. Bacterial diseases can travel in apparently acceptable planting material. Fungal and oomycete pathogens may infect tubers in the field, during harvest or in storage.

Physiological quality matters as well. Seed that is too young, too old, poorly stored, dehydrated or excessively sprouted may establish unevenly even when it is free from important pathogens.

Seed quality therefore has several dimensions:

Genetic identity and varietal purity.
Pathogen and pest status.
Physiological age.
Tuber size and condition.
Storage history.
Sprouting behaviour.
Mechanical damage.
Traceability and generation history.

Calling planting material “certified” does not mean that every tuber is perfect or completely pathogen-free. Certification establishes that the crop and lot were produced, inspected and tested according to defined standards and tolerances.

Its purpose is risk reduction—not biological perfection.

Seed degeneration quietly erodes productivity

One of the defining challenges in potato systems is seed degeneration.

When growers repeatedly save tubers from the previous harvest, virus and other disease levels may increase. Varietal mixtures, physiological ageing and poor storage can further weaken planting quality.

The decline is not always dramatic in a single season. A crop may emerge, grow and produce potatoes while gradually yielding less than its genetic potential.

This makes degeneration easy to underestimate.

A grower may attribute poor performance to soil fertility, weather or management without recognising that the seed itself has become an important yield constraint.

The impact also varies by environment. High aphid pressure can accelerate the spread of viruses. Warmer climates may permit vector activity for longer periods. In some high-altitude or cooler seed zones, lower vector pressure helps preserve seed health for additional generations.

Varieties differ too. Some show conspicuous virus symptoms that make infected plants easier to remove, while others can carry infection with few obvious signs.

There is consequently no universal answer to how many times a grower can safely recycle seed.

The decision should reflect the crop’s intended market, regional disease pressure, variety, testing availability and the health of the starting material.

Advanced seed systems face their own pressures

The seed challenge is not confined to lower-income countries.

North America and Europe possess some of the world’s most developed seed potato industries, yet their systems face increasing pressure from disease, regulation, production costs and international trade requirements.

Seed-producing regions depend on strict generation control, field inspection, laboratory testing, post-harvest evaluation, sanitation and traceability. Maintaining those systems is expensive.

Seed growers also assume unusual commercial risk. They must multiply varieties before final demand is known, carry inventory through storage and meet standards that may differ between domestic and export markets.

If a seed lot exceeds a virus or disease tolerance, its value can fall sharply. A detection of a regulated pathogen may trigger investigation, movement restrictions or destruction.

International seed trade introduces another layer of complexity.

The exporting country may certify a lot according to its national standards, while the importing country applies different sampling procedures, pest tolerances or class terminology. Disagreement can lead to rejected consignments even when exporters believe the seed complied with the agreed requirements.

Europatat reported growing difficulties involving European seed potato exports to Türkiye, including inconsistent results between consignments and high rejection rates reported by some exporters. The organisation called for closer alignment between plant-protection authorities, testing procedures and international standards.

The issue illustrates a broader problem: seed trade depends not only on plant health but on trust between regulatory systems.

Without predictable protocols, companies may avoid a market rather than assume the risk of rejection after seed has already been produced and shipped.

New genetics can arrive faster than seed systems can respond

Breeding is accelerating.

Genomic selection, marker-assisted breeding, gene editing, diploid breeding and improved phenotyping allow researchers to identify useful traits more efficiently. Digital catalogues are also making breeding material and performance information more accessible.

In July 2026, the International Potato Center launched its Digital Potato Catalogue, featuring improved varieties and advanced breeding clones. The platform is intended to support breeders and research partners across Africa, Asia, Latin America and the Caribbean by making it easier to identify and access useful germplasm.

This is an important step. Breeders cannot use material they do not know exists, and countries should not have to duplicate work unnecessarily when suitable resistance or adaptation traits are already available.

But digital access to information does not create physical seed.

A catalogue may identify a variety with the right maturity, disease resistance and market quality. The material must still pass through phytosanitary transfer, quarantine, national evaluation, registration and multiplication.

The digital and biological pipelines must therefore be connected.

Otherwise, the industry may become very good at identifying solutions that remain unavailable to the farmers who need them.

Mozambique demonstrates the importance of local multiplication

Mozambique’s approval of five new potato varieties in 2026 offers a useful example.

According to the International Potato Center, the varieties were selected to improve productivity, disease resistance and adaptation while strengthening food security. Mozambique has been spending close to US$3 million annually on imported seed potatoes, according to CIP.

Importing seed can provide rapid access to high-quality material, particularly when domestic production capacity is limited. But continuing dependence creates exposure to freight costs, exchange rates, border requirements and external supply availability.

Approving locally adapted varieties is only the first step. Mozambique must now develop sufficient early-generation material, seed multipliers, inspection capacity, storage and distribution to place those varieties in growers’ fields.

If domestic multiplication remains inadequate, the country may possess approved genetics without achieving meaningful seed independence.

The same pattern occurs elsewhere. National variety lists may contain promising cultivars that occupy little commercial acreage because the seed pipeline never developed sufficiently.

Rapid multiplication is changing early-generation seed

Several technologies are being used to accelerate the production of healthy starter material.

Tissue culture allows pathogen-tested plants to be multiplied under controlled laboratory conditions. These plantlets can then produce minitubers in screenhouses, hydroponic systems, aeroponic units or specialised substrates.

Aeroponics suspends plant roots in a protected environment and supplies nutrients through a mist. Under suitable management, plants can produce multiple minitubers that are harvested progressively.

The system can deliver high multiplication rates and reduce exposure to soilborne pathogens. It also requires reliable power, water quality, nutrient management, sanitation, skilled operators and substantial capital.

A technologically impressive aeroponic unit that cannot be maintained locally will not strengthen a seed system.

Sand hydroponics and other substrate systems may offer a more practical balance in some regions. They can provide clean, controlled minituber production with less technical complexity than sophisticated aeroponics.

The right technology is not necessarily the one with the highest theoretical multiplication rate. It is the one that can operate reliably, produce seed at a competitive cost and maintain health standards over time.

Rooted apical cuttings can shorten the pathway

Rooted apical cuttings are gaining attention, particularly in African and Asian seed systems.

In this approach, cuttings are taken from pathogen-tested mother plants, rooted in a nursery or screenhouse and sold as transplant material. Seed producers plant the cuttings to produce tubers that enter the multiplication chain.

The International Potato Center describes the system as having two main stages: production of cuttings under protected conditions, followed by field production of seed tubers.

The potential advantages include:

Faster multiplication from clean mother plants.
Lower cost per plant compared with some minituber systems.
Reduced reliance on large quantities of imported seed tubers.
Opportunities for specialised nurseries and decentralised multipliers.
Faster introduction of newly released varieties.

A 2026 FAO innovation entry reported that rooted apical cutting systems could reduce early-generation seed production costs substantially compared with conventional tissue-culture pathways in sub-Saharan Africa.

However, cuttings require careful handling.

They are living transplants with less stored energy than seed tubers. Nursery quality, transport, hardening, planting moisture, field establishment and grower training become critical.

A seed tuber can tolerate a degree of handling and delayed planting that may seriously damage a young cutting.

The technology therefore shifts some risk from the tuber multiplication stage to nursery management and transplant establishment.

Decentralisation can improve access—but complicate quality control

Traditional seed systems often concentrate early-generation production in government facilities, research stations or large specialist companies.

This centralisation supports technical oversight, but seed may remain expensive or geographically distant from smaller growers.

Decentralised multiplication brings seed closer to farming communities. Trained growers, cooperatives or local businesses can purchase early-generation material, multiply it and sell quality seed within the region.

This can reduce transport costs, create rural enterprises and improve access to locally preferred varieties.

But decentralisation increases the number of people and sites responsible for maintaining seed health and varietal identity.

Without training, inspection and traceability, local multiplication can become another informal system with a more modern starting point.

Successful decentralisation requires:

Reliable access to tested early-generation material.
Clear multiplication protocols.
Field inspection and disease identification.
Isolation and sanitation practices.
Appropriate storage.
Lot identification and record-keeping.
Regular testing.
A market willing to pay for improved seed.
A realistic quality-assurance category.

The final point is important. Full formal certification may be too expensive for every small local multiplier, while completely unregulated multiplication creates unacceptable risk.

Some countries have introduced quality-declared seed or similar intermediate categories. These systems apply defined minimum standards without requiring every element of a highly centralised certification programme.

Such models can be useful, but the quality claim must remain credible. Lower administrative cost should not become an excuse for weak biological standards.

True potato seed could transform logistics

Hybrid true potato seed represents one of the most potentially disruptive developments in potato multiplication.

True potato seed is the botanical seed produced in potato berries. It should not be confused with conventional seed potatoes, which are tubers.

A hectare planted with tubers may require several tonnes of seed potatoes. Botanical seed requirements can be measured in grams.

This creates obvious logistical advantages.

True seed is light, compact and comparatively easy to store and transport. It does not carry most of the tuber-borne disease burden associated with vegetative seed, although seed health, testing and phytosanitary controls remain necessary.

Hybrid diploid breeding aims to produce genetically uniform parental lines whose offspring combine desirable traits more predictably than traditional open-pollinated potato seed.

If successful at scale, hybrid true potato seed could:

Accelerate distribution of new genetics.
Reduce transport and storage costs.
Simplify international movement.
Improve access in regions without established seed-tuber systems.
Reduce dependence on repeated imports of bulky tubers.
Enable more rapid replacement of varieties.

But the technology should not be presented as a universal replacement for seed potatoes.

Commercial production from botanical seed requires either direct seeding, transplanting seedlings or producing seedling tubers for later planting. Each route introduces agronomic requirements unfamiliar to many potato growers.

Challenges include seedling vigour, establishment uniformity, crop duration, tuber uniformity, nursery management, mechanisation and adaptation to existing production systems.

Processing industries also require extremely consistent raw material. Hybrid true-seed varieties must demonstrate not only genetic promise but dependable commercial performance across large acreages and storage seasons.

True potato seed may be transformative in some markets and less attractive in others. The future is likely to contain several parallel planting systems rather than one replacing all the rest.

Seed affordability is as important as seed availability

A grower can know that certified seed would improve productivity and still be unable to purchase it.

Conventional seed tubers represent a large share of potato establishment costs. Transport can increase the price further because the buyer is moving several tonnes of perishable material per hectare.

Smallholders may therefore recycle their own crop even when its health is declining.

This is not necessarily ignorance or resistance to innovation. It may be a rational response to cash-flow constraints.

Quality seed requires payment before the crop generates income. Growers without affordable credit may be unable to make that investment.

Seed-system development consequently needs financial as well as technical solutions:

Smaller trial quantities.
Forward purchase agreements.
Cooperative purchasing.
Seasonal credit.
Staged payment.
Processor-supported seed programmes.
Demonstration plots showing realistic economic returns.
Local multiplication that reduces freight.

Subsidising seed can accelerate initial adoption, but permanent dependence on subsidies may conceal an unviable supply chain.

The objective should be a market in which seed producers can operate profitably and growers can recover the cost through improved marketable yield and quality.

Processors have a direct interest in seed systems

Processors sometimes view seed supply as primarily a grower or breeder issue. That is shortsighted.

A processing plant depends on varieties with specific dry matter, sugar behaviour, shape, size, defect resistance and storage characteristics.

If growers cannot obtain enough healthy seed of those varieties, factory raw-material quality becomes inconsistent.

Processors can help strengthen seed systems by:

Forecasting variety demand several years ahead.
Supporting early multiplication of promising material.
Conducting transparent variety trials.
Sharing processing-quality data.
Offering contracts that justify grower adoption.
Coordinating seed availability with commercial acreage.
Avoiding abrupt variety changes that leave seed producers with stranded inventory.

The seed pipeline needs predictable signals.

A seed company cannot multiply large volumes of a variety based only on informal interest. Conversely, processors cannot expect immediate commercial acreage if they wait until final approval before communicating demand.

Earlier coordination distributes risk more fairly.

Seed multiplication must be considered during breeding

Breeders traditionally select varieties for agronomic, disease, market and quality traits. Multiplication performance deserves greater attention.

Some varieties produce many suitably sized seed tubers, while others have poor multiplication characteristics. Dormancy, tuber number, size distribution, storage behaviour and susceptibility to mechanical damage can all affect seed economics.

A variety that performs brilliantly as a ware or processing crop but multiplies inefficiently may be slow and expensive to commercialise.

True potato seed introduces additional multiplication traits, including flowering, fertility, berry formation, parental seed yield and seedling uniformity.

The future breeding target is therefore not only a high-performing commercial potato. It is a potato that can also move through the intended seed system efficiently.

Traceability is becoming a digital function

Seed traceability has traditionally relied on field records, certification tags, lot numbers and paper movement documents.

Digital systems can connect tissue-culture batches, nursery production, field generations, inspections, tests, storage lots and final buyers.

CIP-supported work in West Bengal, India, has explored digital traceability for tissue-culture laboratories, rooted-cutting nurseries and seed producers. The proposed system follows planting material across stages while providing customised advice to participants.

A good digital system could help answer:

Where did the starting material originate?
How many multiplication cycles has it completed?
Which tests were conducted?
Where was it planted?
Which lots were combined or separated?
Who purchased the resulting seed?
Was a disease problem linked to related lots?

This becomes especially valuable when multiplication is decentralised.

Technology, however, cannot make false data accurate. Digital traceability works only when participants record activities consistently and when physical lot identity is preserved.

A sophisticated app attached to poorly labelled seed piles creates an illusion of control rather than real traceability.

Local adaptation remains essential

A healthy seed tuber of an unsuitable variety is still a poor investment.

Varieties must fit the climate, day length, growing season, disease environment, storage system and intended market.

A potato bred for long northern days may not tuberise or mature appropriately in a tropical highland environment. A variety popular with fresh-market consumers may fail a processor’s dry-matter or fry-colour requirements.

Local trials must evaluate more than yield.

They should include:

Maturity and crop duration.
Heat and drought response.
Disease and pest resistance.
Tuber size and shape.
Marketable yield.
Dormancy and storability.
Consumer preference.
Cooking or processing quality.
Seed multiplication performance.
Economic return under local management.

Seed-system investment should follow validated market demand. Multiplying large quantities of a variety before growers, traders, processors or consumers accept it can produce a technically successful but commercially stranded seed crop.

Genetic diversity must not be narrowed carelessly

Commercial seed systems favour uniformity. Growers, packers and processors want varieties that perform consistently.

That uniformity brings efficiency but can increase vulnerability when large areas depend on a narrow genetic base.

The Andes contain thousands of native potato varieties and numerous wild relatives carrying traits related to disease, pests, heat, drought, frost and nutritional quality.

The International Potato Center’s germplasm resources and the farmer-managed diversity of Andean communities are therefore strategically important to the entire industry.

Digital catalogues can improve awareness and use of these resources. But conservation cannot be reduced to a database.

Living material must be maintained safely in genebanks, fields and communities. Indigenous and farming communities that have conserved potato diversity over generations should be recognised as knowledge holders and partners, not merely as sources of genetic material.

The commercial seed of tomorrow may depend on traits preserved for centuries outside formal breeding programmes.

The real innovation is a functioning chain

No single multiplication technology will solve the global seed problem.

Aeroponics can produce large numbers of minitubers, but it requires technical infrastructure. Rooted cuttings can accelerate multiplication, but they need capable nurseries and careful field establishment. True potato seed can transform logistics, but it introduces a different production system. Conventional certified seed remains highly effective where established infrastructure and markets support it.

The correct question is not which technology is most impressive.

It is which combination creates a reliable chain from clean starting material to the grower.

That chain includes:

Germplasm and breeding.
Variety evaluation and registration.
Pathogen-tested starting material.
Rapid early-generation multiplication.
Field multiplication.
Quality assurance.
Storage and transport.
Finance.
Market demand.
Grower training.
Traceability.
Planned seed renewal.

If one link fails, the value of all the others is reduced.

A country can build an advanced tissue-culture laboratory and still have poor commercial seed if field multiplication collapses. It can certify seed rigorously but produce too little for most growers. It can distribute subsidised seed without establishing a sustainable replacement system.

Seed success must be measured in healthy commercial hectares—not plantlets produced, varieties registered or laboratories opened.

The potato industry’s missing middle

The global industry often concentrates on two ends of the innovation system.

At one end are breeders, geneticists and researchers developing better potatoes. At the other are growers expected to plant them.

Between those groups lies the missing middle: laboratories, nurseries, minituber producers, seed farmers, inspectors, diagnostic services, storage operators, distributors, financiers and advisers.

These professionals determine whether genetic progress travels—or remains trapped in research stations and catalogues.

The seed multiplication gap is consequently not a narrow technical problem. It is a structural constraint on climate adaptation, disease management, food security and commercial competitiveness.

The world does not lack promising potato genetics.

What it lacks in many regions is a sufficiently fast, trusted and affordable system for delivering those genetics in a form the grower can plant.

Closing that gap may be less glamorous than announcing a breakthrough variety.

But until it is closed, many of the industry’s most important breakthroughs will remain possibilities rather than crops.