Plant Responses to Combined Abiotic Stresses

Plants in natural and agricultural environments often encounter multiple abiotic challenges simultaneously, such as drought, heat, salinity and high irradiance. These stress combinations elicit unique physiological and molecular responses that cannot be simply predicted by summing responses to individual stresses. Commonly observed adjustments include modulation of stomatal conductance, accumulation of osmolytes, activation of antioxidant systems and induction of stress‐responsive gene networks. Interactions among signalling pathways often lead to synergistic or antagonistic outcomes, reshaping hormone balances—particularly those of abscisic acid, jasmonic acid and salicylic acid—and modifying metabolic fluxes through central routes such as the unfolded protein response and the phenylpropanoid network. Crop species show variation in tolerance to combined stress, reflecting differences in root architecture, photosynthetic efficiency and capacity to maintain cellular homeostasis. A holistic understanding of these processes is crucial for breeding and biotechnological efforts aimed at enhancing resilience under the complex stress regimes imposed by climate change.

Research from Nature Portfolio

Recent work in maize hybrids has revealed that the simultaneous application of drought and elevated temperatures imposes more severe oxidative and yield‐related penalties than either stress alone. Sensitive and tolerant hybrids differed in their ability to maintain photosynthetic pigments, nutrient uptake and reactive oxygen species scavenging. Tolerant genotypes exhibited enhanced accumulation of osmoprotectants, stronger antioxidant enzyme activities and tighter regulation of stomatal aperture, leading to improved water‐use efficiency and kernel set under stress combination. These findings underscore the importance of integrating morpho‐physiological traits with biochemical and molecular markers to select and develop cultivars capable of withstanding concurrent heat and water deficits.

Plant Responses to Combined Abiotic Stresses publication trend

The graph below shows the total number of articles in plant responses to combined abiotic stresses across all publications each year (not limited to Nature Index journals).

Technical terms

Osmolyte: Small organic compound (e.g., proline, glycine betaine) that plants accumulate to maintain cellular osmotic balance under stress.

Reactive oxygen species (ROS): Highly reactive molecules (e.g., hydrogen peroxide, superoxide) generated under stress, which can damage cellular components if not scavenged.

Unfolded protein response (UPR): A cellular quality control mechanism activated by accumulation of misfolded proteins in the endoplasmic reticulum, enhancing protein‐folding capacity.

Omics: Comprehensive approaches (such as transcriptomics, proteomics, metabolomics) that profile global changes in genes, proteins or metabolites.

Stomatal conductance: Rate at which carbon dioxide enters and water vapour exits leaves through stomata, regulating photosynthesis and transpiration.

References

1. Shared and unique responses of plants to multiple individual stresses and stress combinations: physiological and molecular mechanisms. Frontiers in Plant Science (2015).
2. Interactive effects of drought and heat stresses on morpho-physiological attributes, yield, nutrient uptake and oxidative status in maize hybrids. Scientific Reports (2019).
3. Omics analyses in citrus reveal a possible role of RNA translation pathways and Unfolded Protein Response regulators in the tolerance to combined drought, high irradiance, and heat stress. Horticulture Research (2023).
4. Global Warming, Climate Change, and Environmental Pollution: Recipe for a Multifactorial Stress Combination Disaster. Trends in Plant Science (2021).