Drought is one of the most extensively researched agricultural applications of trehalose.
When water becomes limited, crops face far more than simple dehydration. Drought can restrict photosynthesis, reduce growth, disrupt nutrient movement, damage cellular membranes and increase oxidative stress — all of which can reduce crop performance and productivity.
Trehalose is attracting increasing interest as a way of helping plants maintain physiological function during periods of water stress.
A major 2026 systematic review and meta-analysis identified 20 separate studies of externally applied trehalose under water-deficit conditions, making drought the largest single stress category in the agricultural trehalose literature.[1]
Across multiple crops and experimental systems, trehalose has been associated with improved plant water status, photosynthesis, antioxidant activity, root and shoot growth and several other measures of drought tolerance.[1–7]
For growers, agricultural formulators and crop researchers, this makes water stress one of the most promising areas for the development of trehalose-based plant-biostimulant technologies.
How Drought Affects Crops
Water is fundamental to almost every aspect of plant growth.
As soil moisture declines, plants begin closing their stomata to reduce water loss. This helps conserve water, but it also restricts the carbon dioxide available for photosynthesis.
As drought develops, crops can experience:
- reduced photosynthesis
- lower chlorophyll levels
- loss of cellular water
- reduced leaf expansion
- slower root and shoot growth
- oxidative stress
- membrane damage
- disrupted nutrient transport
- reduced flowering, grain filling and fruit development.
Water stress also increases the production of reactive oxygen species.
At excessive concentrations, these compounds can damage membranes, proteins and the photosynthetic machinery.
Successful drought tolerance therefore depends on several systems working together: maintaining water status, protecting photosynthesis, controlling oxidative stress and preserving cellular integrity.
Trehalose has been shown to influence each of these areas.[1]
What Does the Research Show?
The broadest evidence comes from the 2026 meta-analysis of externally applied trehalose under abiotic stress.[1]
Researchers screened 659 publications and identified 52 eligible studies, including 20 investigating drought or water deficit.
Under water-stress conditions, trehalose was associated with improvements in:
- relative water content
- water-use efficiency
- photosynthetic rate
- stomatal conductance
- transpiration
- intercellular carbon dioxide
- chlorophyll
- antioxidant activity
- shoot growth
- root growth.[1]
Trehalose treatment was also associated with lower levels of hydrogen peroxide, lipid peroxidation and membrane permeability — all important indicators of cellular stress and damage.[1]
The research therefore points towards a broad protective response rather than a single isolated mechanism.
Helping Plants Maintain Water Status
One of the clearest findings is improved relative water content.
Relative water content measures how much water plant tissue retains compared with its fully hydrated state and is widely used as an indicator of plant hydration during drought.
The 2026 meta-analysis found a significant positive effect of trehalose on relative water content under water-deficit conditions.[1]
It also found improved water-use efficiency.[1]
This is commercially important because maintaining hydration helps plants continue functioning for longer when water availability becomes restricted.
Trehalose appears to support this response through a combination of osmotic adjustment, cellular protection and changes in plant stress physiology.
Maize: Field Evidence Under Water Stress
Maize provides an important example because trehalose has been studied under field water-deficit conditions.
Researchers applied 30 mM trehalose as a foliar treatment to two maize cultivars exposed to restricted irrigation.[2]
Water stress reduced biomass, photosynthetic performance and plant-water relations.
Trehalose treatment improved several of these measures and also influenced antioxidant defence.[2]
This study is particularly relevant because it moved beyond controlled laboratory systems and demonstrated that foliar trehalose could influence the drought response of a major field crop under agricultural conditions.
Sunflower: Water Status, Growth and Yield
Research in sunflower has produced similarly encouraging results.
A 2022 study exposed two sunflower cultivars to drought at 60% field capacity and applied foliar trehalose at 10, 20 and 30 mM.[3]
Trehalose improved:
- relative water content
- shoot and root growth
- soluble sugars
- soluble proteins
- antioxidant-enzyme activity
- mineral status
- yield-related characteristics.[3]
Treatment also reduced membrane permeability, indicating better maintenance of cellular integrity.[3]
The strongest overall response occurred at 10 mM under the conditions tested.[3]
For agricultural product development, this is useful because it shows the importance of optimising concentration rather than simply increasing dose.
Quinoa: Stronger Antioxidant Protection
Field research in quinoa provides further evidence.
Plants exposed to water deficit showed increased hydrogen peroxide and lipid peroxidation, both indicators of oxidative stress.[4]
Foliar trehalose reduced these markers while increasing the activity of important antioxidant enzymes, including:
- superoxide dismutase
- catalase
- peroxidase
- ascorbate peroxidase.[4]
Trehalose also influenced soluble sugars, endogenous trehalose, proline and other compounds involved in osmotic adjustment.[4]
A separate quinoa field study reported improvements in growth, photosynthetic pigments, seed yield and several characteristics of seed quality following trehalose treatment under water deficit.[5]
Together, these studies show that the response extends from cellular protection through to crop performance.
Protecting Photosynthesis During Drought
Photosynthesis can decline rapidly when plants experience water stress.
As stomata close and water availability falls, chloroplasts and photosynthetic electron transport become increasingly vulnerable.
The 2026 meta-analysis found beneficial effects of trehalose on photosynthetic rate and several associated gas-exchange measurements under water deficit.[1]
Detailed research in winter wheat has shown how this protection can operate at the level of photosystem II.[6]
Trehalose pretreatment helped maintain:
- photochemical efficiency
- electron transport
- cyclic electron flow
- the proton gradient across thylakoid membranes
- ATPase activity.[6]
The researchers concluded that trehalose reduced stress-induced inhibition of photosystem II.[6]
For crop production, this matters because protecting photosynthesis helps maintain the process that ultimately drives plant growth and yield.
Strengthening Antioxidant Defence
Drought also creates oxidative stress.
When reactive oxygen species accumulate faster than plants can neutralise them, they begin damaging membranes, proteins and cellular structures.
Plants use antioxidant enzymes to control this damage.
Across the drought literature, trehalose has been associated with increased activity of important antioxidant systems, including:
- superoxide dismutase
- catalase
- peroxidase.[1]
At the same time, treated plants have shown reductions in:
- hydrogen peroxide
- lipid peroxidation
- membrane permeability.[1–4]
Similar responses have been observed in maize, sunflower and quinoa.[2–4]
Antioxidant protection therefore represents one of the most consistent mechanisms through which trehalose may help crops remain functional during drought.
Protecting Cellular Membranes
Cell membranes are particularly vulnerable when plant tissues lose water.
Dehydration changes the physical organisation of membrane lipids, while oxidative stress can cause further damage.
Trehalose is well known for its interactions with water and biological structures during dehydration.
In drought-stressed plants, this physical protection appears to work alongside changes in antioxidant metabolism.
The research repeatedly reports lower membrane permeability and reduced lipid damage in trehalose-treated plants.[1,3]
Better membrane integrity helps preserve normal cellular organisation, nutrient balance and metabolic activity during water stress.
Osmotic Adjustment and Protective Solutes
Plants naturally accumulate soluble compounds when water becomes scarce.
These compatible solutes help cells retain water and maintain function without disrupting normal metabolism.
They include:
- soluble sugars
- proline
- amino acids
- trehalose itself.
Externally applied trehalose can contribute directly to this response while also influencing the accumulation and metabolism of other protective compounds.
In quinoa, for example, treatment affected glucose, sucrose, soluble sugars, endogenous trehalose, proline and free amino acids.[4]
This suggests that externally supplied trehalose can influence the wider carbohydrate and osmotic response of drought-stressed plants.
Can Trehalose Help Protect Crop Growth and Yield?
The evidence is encouraging.
Across the broader 2026 meta-analysis, externally applied trehalose produced beneficial overall effects on measurements including:
- shoot length
- shoot fresh weight
- shoot dry weight
- root length
- root fresh weight
- plant height
- leaf area
- tiller number
- leaf number
- grain yield.[1]
Individual drought studies also show these physiological benefits translating into improved crop performance.
In sunflower, trehalose improved growth and yield-related characteristics under drought.[3]
In quinoa, foliar treatment improved seed yield and several associated traits under water deficit.[5]
Wheat studies have also reported improvements in growth, biochemical responses and yield-related measurements following foliar trehalose treatment.[7]
The commercial opportunity is therefore not simply to protect individual cells, but to help plants maintain more of their normal growth and productive capacity when water stress would otherwise reduce performance.
How Is Trehalose Applied?
Most agricultural drought research has used foliar application.
Across the complete 2026 abiotic-stress evidence base:
- 34 studies used foliar treatment
- 15 used root application
- 3 used seed priming.[1]
Representative drought experiments include:
| Crop | Example trehalose treatment |
|---|---|
| Quinoa | 0.1–0.5 mM |
| Wheat | 10 mM |
| Sunflower | 10–30 mM |
| Maize | 30 mM |
These published treatments provide useful starting points for crop trials and formulation development.[2–5,7]
The optimum formulation will depend on factors including:
- crop species
- cultivar
- growth stage
- severity and duration of water stress
- application method
- environmental conditions
- timing and frequency
- other formulation ingredients.
For commercial development, this creates considerable scope to optimise trehalose around a particular crop and agricultural system.
Where Trehalose Fits in Drought Management
Trehalose is particularly suited to situations where crops experience periods of water stress rather than continuous optimal irrigation.
Potential applications include:
- intermittent drought
- reduced-irrigation regimes
- temporary water shortages
- high evaporative demand
- dry growing seasons
- marginal environments
- crop-establishment stress.
The objective is to help the plant maintain physiological function while water availability is restricted.
This complements rather than replaces established agronomic approaches such as irrigation management, crop selection and soil-water conservation.
For the closely related evidence on salt-induced water stress, see Trehalose and Salinity Stress in Crops →.
Drought and Salinity: Related Stress Pathways
Drought and salinity are different agricultural problems, but they share several physiological effects.
Both can make water harder for plants to obtain.
Both can:
- reduce photosynthesis
- increase oxidative stress
- disrupt cellular membranes
- alter osmotic balance
- reduce crop growth.
Trehalose has therefore become an important research target across both stress categories.
Its effects on water relations, antioxidant defence, photosynthesis and osmotic adjustment provide a biological connection between the two applications.
This makes trehalose particularly interesting for agricultural technologies intended for crops grown in increasingly challenging environments.
Trehalose in Seed and Root-Zone Applications
Foliar treatment currently dominates drought research, but other delivery routes are also attracting interest.
Trehalose can be incorporated into seed treatments and biological seed coatings designed to support early crop establishment under water stress.
Engineered coatings containing trehalose, beneficial microorganisms and water-retaining materials have already been tested under semi-arid conditions.
For the wider evidence, see Trehalose in Seed Treatments & Coatings →.
Trehalose is also relevant to microbial agricultural products, where it can help stabilise beneficial organisms used in seed and soil applications.
See Trehalose in Biofertilisers & Microbial Inoculants →.
A Strong Opportunity for Plant-Biostimulant Development
The evidence surrounding trehalose and drought has progressed substantially.
It now includes:
- controlled plant studies
- field experiments
- multiple crop species
- physiological studies
- biochemical studies
- photosynthetic-mechanism research
- yield measurements
- a systematic meta-analysis incorporating 20 water-deficit studies.[1]
Across this evidence base, the strongest recurring effects involve:
Water Status
Helping plants maintain hydration during water deficit.
Photosynthesis
Supporting photosynthetic activity and protecting photosystem function.
Antioxidant Defence
Strengthening the plant's ability to control damaging reactive oxygen species.
Osmotic Adjustment
Supporting the accumulation and regulation of protective soluble compounds.
Membrane Stability
Reducing cellular and lipid damage associated with dehydration.
Growth and Productivity
Helping maintain root growth, shoot growth and crop performance under stress.
Together, these mechanisms provide a strong biological foundation for using trehalose in the development of plant-biostimulant and crop-stress technologies.
Trehalose Is Already Being Developed for Agricultural Use
Agricultural use of trehalose is moving beyond academic research.
NAGASE identifies trehalose for applications including:
- plant biostimulants
- seed coatings
- microbial inoculants
- biological agricultural formulations.[8]
Nagase Viita is also actively developing trehalose-based agricultural technologies internationally, including applications aimed at crops exposed to drought and other environmental stresses.[9]
This combination of published research and active manufacturer development makes drought one of the strongest areas for commercial exploration of agricultural trehalose.
Developing Trehalose Applications for Drought-Stressed Crops
Trehalose UK is expanding its support for agricultural and plant-science applications of genuine Japanese trehalose.
We welcome enquiries from:
- growers
- agronomists
- crop researchers
- plant-biostimulant manufacturers
- agricultural formulators
- universities
- agricultural biotechnology companies
- businesses developing crop-stress technologies.
We can support projects from research and formulation quantities through to larger commercial supply.
For substantial requirements, see Bulk TREHA® Supply →.
If you are investigating trehalose for drought tolerance, reduced-irrigation systems, plant-biostimulant development or crop trials, contact Trehalose UK → to discuss your application and supply requirements.
Further Reading
Trehalose in Agriculture: Uses, Benefits & Research →
Trehalose and Salinity Stress in Crops →
Trehalose in Seed Treatments & Coatings →
Trehalose in Biofertilisers & Microbial Inoculants →
Agriculture & Plant Science Guides →
References & Further Reading
[1] Adrielle Cristine Domingos Adão, Antônio Rodrigues da Cunha Neto, Marina Wolowski, and Thiago Corrêa de Souza. 2026. “Exogenous Trehalose Mitigates Abiotic Stress in Plants by Improving Morphophysiology: A Meta-Analysis.” Journal of Crop Science and Biotechnology 29: 547–565. DOI: 10.1007/s12892-026-00355-1. Systematic review and meta-analysis of 52 studies, including 20 studies involving water deficit.
[2] Qasim Ali and Muhammad Ashraf. 2011. “Induction of Drought Tolerance in Maize (Zea mays L.) due to Exogenous Application of Trehalose: Growth, Photosynthesis, Water Relations and Oxidative Defence Mechanism.” Journal of Agronomy and Crop Science 197, no. 4: 258–271. DOI: 10.1111/j.1439-037X.2010.00463.x.
[3] Firdos Kosar, Khalid S. Alshallash, Nudrat Aisha Akram, Muhammad Sadiq, Muhammad Ashraf, Dalal Hussien M. Alkhalifah, Arafat Abdel Hamed Abdel Latef, and Amr Elkelish. 2022. “Trehalose-Induced Regulations in Nutrient Status and Secondary Metabolites of Drought-Stressed Sunflower (Helianthus annuus L.) Plants.” Plants 11, no. 20: 2780. DOI: 10.3390/plants11202780.
[4] Mervat Shamoon Sadak, Hala Mohammed Safwat El-Bassiouny, and Mona Gergis Dawood. 2019. “Role of Trehalose on Antioxidant Defense System and Some Osmolytes of Quinoa Plants under Water Deficit.” Bulletin of the National Research Centre 43: 5. DOI: 10.1186/s42269-018-0039-9.
[5] Mona Gergis Dawood. 2018. “Improving Drought Tolerance of Quinoa Plant by Foliar Treatment of Trehalose.” Agricultural Engineering International: CIGR Journal, Special Issue: 132–143.
[6] Y. Luo, Y. Xie, D. He, W. Wang, and S. Yuan. 2021. “Exogenous Trehalose Protects Photosystem II by Promoting Cyclic Electron Flow under Heat and Drought Stresses in Winter Wheat.” Plant Biology 23, no. 5: 770–776. DOI: 10.1111/plb.13277.
[7] Hala Mohammed Safwat El-Bassiouny, Mervat Shamoon Sadak, and Amira A. Abdallah. 2016. “Effect of Maltose and Trehalose on Growth, Yield and Some Biochemical Components of Wheat Plant under Water Stress.” Annals of Agricultural Sciences 61, no. 2: 267–274. DOI: 10.1016/j.aoas.2016.05.002.
[8] NAGASE Europe. “Trehalose for Agriculture.” Manufacturer information covering trehalose for plant biostimulants, seed coatings, microbial inoculants and biological formulations.
NAGASE agricultural information →
[9] Nagase Viita Co., Ltd. 2026. “Trehalose-Based Agricultural Support Project Selected for JICA Biz Program (FY2025).” Current development programme investigating trehalose as a direct agricultural biostimulant and as a stabilising ingredient for biological formulations.