Plant Tissue Culture During the Rainy Season: Risks, Management, and Production Opportunities
selecting younger tissues, reducing the time between cutting and culture initiation, applying antioxidants, transferring explants to fresh medium early, or using adsorbent materials where appropriate.
For example, shoots collected from a mother plant exposed to heavy rainfall and physical injury may release more phenolic compounds than shoots collected from a sheltered plant on a dry day.
Stronger Sterilization Is Not Always Better
Increasing the concentration or exposure time of disinfectants may appear to be the most direct solution to rainy-season contamination. However, stronger treatments can also damage buds and meristematic tissues.
The most useful sterilization protocol is therefore not the one that produces the highest percentage of visibly clean vessels. It is the protocol that produces the highest number of explants that are both clean and alive.
For example, one treatment may reduce contamination to 10% but cause 70% tissue mortality. Another may result in 20% contamination while producing 60% clean, surviving explants with active shoot growth. From a production perspective, the second treatment may be more effective.
Seasonal Influence Declines After Stable Cultures Are Established
Once contamination-free cultures have been established and entered the multiplication stage inside a controlled growth room, the direct influence of the rainy season becomes much smaller.
If temperature, lighting, sanitation, and humidity remain stable, production can generally continue as normal. Remaining risks are more likely to come from power failures, temperature fluctuations, condensation inside culture vessels, or latent contamination introduced with the original explants.
For example, during several consecutive rainy days, an air-conditioning system may struggle to control humidity. This can increase condensation inside culture vessels and contribute to hyperhydricity, even when the culture medium remains unchanged.
Acclimatization Brings Both Advantages and Risks
The acclimatization stage is where rainy-season conditions can be either beneficial or harmful.
High external humidity can reduce water loss from newly deflasked plantlets. This may help plantlets adjust more gradually to the outside environment. However, if the growing medium remains waterlogged, leaves stay wet for long periods, and air circulation is poor, the risks of root rot, foliar disease, algae growth, and weak elongated plants increase.
Plantlets should therefore be acclimatized under a rain-protected structure using raised benches and clean, well-draining substrates. Humidity should be reduced gradually while ventilation and light are increased.
Watering should be based on the actual moisture level of the substrate rather than on a fixed schedule. During continuous rainfall, the medium may remain wet much longer than expected, even when no additional water has been applied.
Commercial Production Requires Seasonal Data
For commercial production, performance data should be recorded separately for each cultivar and mother plant line. Useful records include:
Cultivar and mother plant code
Explant collection date
Bud or node position
Rainfall conditions
Sterilization treatment
Operator
Early contamination
Delayed contamination
Shoot multiplication
Rooting success
Acclimatization survival
Final number of marketable plants
The most important measurement is not simply the percentage of clean vessels during the first week. It is the number of high-quality plants ultimately produced from each initial explant.
For example, explants of the same species may be collected before the rainy season, during peak rainfall, and near the end of the rainy season. The end-of-season collection may produce the greatest number of clean, actively multiplying cultures, even if it does not produce the lowest initial contamination rate.
Using the Rainy Season Strategically
Plant tissue culture can be conducted successfully during the rainy season, and for some species it may be an excellent period for collecting actively growing shoots or nodes.
However, the rainy season should not be classified as universally good or bad for every plant. The most effective approach is to:
Maintain mother plants under rain protection
Select clean tissues at the correct physiological stage
Compare several sterilization treatments
Quarantine newly established cultures
Monitor latent contamination through multiple subcultures
Control condensation and humidity in the growth room
Use well-drained substrates during acclimatization
Base irrigation on actual substrate moisture
Record results by species, cultivar, and season
With a reliable crop-specific database, laboratories can identify the collection period and production conditions that generate the highest number of healthy, usable plants rather than relying on general assumptions about the rainy season.
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