How climate signals shape fruit quality

Fruit quality is not determined by genetics alone. Water availability, salinity, heat, and cold can all reshape fruit color, sweetness, acidity, aroma, texture, antioxidant activity, and ripening behavior. In some cases, severe stress damages yield and quality; in others, mild environmental stress can improve desirable traits such as sugar content, pigmentation, or nutritional compounds. A new review brings together evidence showing how fruits perceive environmental cues and convert them into molecular signals that regulate quality-related metabolism. By organizing scattered findings into a clearer signaling framework, the review offers a roadmap for understanding how fruit crops respond to changing climates and how quality may be better managed through breeding and cultivation.

Fleshy fruits are a major part of the human diet because they provide sugars, organic acids, pigments, vitamins, antioxidants, and flavor compounds. These traits also determine market value and consumer acceptance. Yet fruit quality is highly sensitive to environmental conditions, including drought, soil salinity, and temperature fluctuations. Previous studies have widely reported that these factors influence fruit development, but many focused on visible or biochemical outcomes rather than the upstream signaling networks that drive them. The field still lacks an integrated view of how environmental perception is connected to transcriptional regulation, metabolic enzymes, and hormone signals. Given these challenges, deeper research is needed into the signaling mechanisms that control fruit quality development under environmental stress.

Researchers from the College of Horticulture, China Agricultural University, and the Institute of Fruits and Vegetables, Xinjiang Academy of Agricultural Sciences, published (DOI: 10.1093/hr/uhag005) this review article on 7 January 2026 in Horticulture Research, summarizing how water deficit, salinity, and temperature stresses modulate fruit quality through environmental sensing, signal transduction, transcriptional regulation, and hormone-related pathways.

The review first explains how environmental factors reshape major quality traits. Under water deficit, fruits may show altered anthocyanin biosynthesis, sugar accumulation, organic acid levels, antioxidant metabolism, and aroma formation. In grapevine, drought-related regulation involves VvAREB2, microRNA vv-miR156b, and downstream components associated with anthocyanin accumulation. In apple, the genes MdERF38 and MdMYB1 are linked with drought-induced pigmentation, while genes such as MdDFR and MdUF3GT participate in anthocyanin biosynthesis. Salinity can also change fruit pigmentation, sugar transport, organic acid accumulation, antioxidant systems, and volatile compounds, with genes such as MdUGT83L3, MdHsp18.2b, and MdVHA-B1 implicated in stress-responsive quality regulation. Temperature adds further complexity: high temperature often suppresses anthocyanin accumulation, whereas low temperature may promote coloration or soluble sugar accumulation depending on the species and developmental stage. The review highlights several core signaling components, including mitogen-activated protein kinase (MAPK) cascades, sucrose nonfermenting 1-related kinase 2 (SnRK2), calcium-dependent protein kinases (CDPKs), calcineurin B-like protein-interacting protein kinases (CIPKs), protein phosphatase 2C (PP2C), E3 ligases, and transcription factors (TFs). Together, these components link environmental perception to metabolic control and hormone production, especially ethylene and abscisic acid (ABA).

The authors said the field is moving beyond describing how stress changes fruit traits toward understanding how fruit cells make quality-related decisions. They said future studies need to connect individual signaling modules into clearer networks within specific fruit species, rather than treating each stress response as an isolated event. They also emphasized that real orchards and production systems often expose fruits to multiple stresses at once, making it important to study how water, salt, heat, and cold signals are integrated. Such work could reveal molecular switches that help maintain fruit quality under increasingly unpredictable growing conditions.

These insights have practical implications for climate-resilient horticulture. If key signaling modules can be validated in major fruit crops, breeders may be able to select varieties with more stable sweetness, color, antioxidant content, texture, and postharvest performance under stress. Growers may also use irrigation, salinity management, temperature control, and mild-stress cultivation strategies more precisely to improve quality without causing yield losses. The review also points to the importance of model fruits such as tomato and strawberry for testing whether signaling cascades discovered in different crops are broadly conserved. Ultimately, decoding these pathways could support fruit production systems that deliver better nutritional and commercial quality in a changing environment.

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References

DOI

10.1093/hr/uhag005

Original Source URL

https://doi.org/10.1093/hr/uhag005

Funding information

This work is financially supported by the Tianshan Talents - Youth Talent Support Project (2023TSYCQNTJ0044), the Beijing Natural Science Foundation (6232019) and the National Key Research and Development Program (2022YFD2100102).

About Horticulture Research

Horticulture Research is an open access journal of Nanjing Agricultural University and ranked number one in the Horticulture category of the Journal Citation Reports ™ from Clarivate, 2023. The journal is committed to publishing original research articles, reviews, perspectives, comments, correspondence articles and letters to the editor related to all major horticultural plants and disciplines, including biotechnology, breeding, cellular and molecular biology, evolution, genetics, inter-species interactions, physiology, and the origination and domestication of crops.