Welcome to The Junction: Polymeric extracellular interfaces and barriers in plant life

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ID: 329759
2026
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Abstract
Abstract In plants, hydrophobic extracellular polymers are precisely deposited within or onto the extracellular matrix at specific cell interfaces. Here, they serve as boundaries, barriers, and contact points with the environment. Classical examples include cuticles that coat plant organ surfaces and Casparian strips that regulate molecular exchanges between the root and the rhizosphere. The barrier functions of these structures were essential for the transition from water to land, the emergence of vasculature transport systems, and the development of resistant components such as bark, pollen walls and seed coats. Although often viewed as a protective armor, these interfaces are frequently selectively permeable and are remodeled to support diverse developmental and physiological functions. They therefore represent key elements in the plant toolbox for balancing gas exchange, nutrient uptake, reproduction, and defense. In this review, we explore current insights into their composition, deposition, evolution, and function of extracellular polymeric barriers. We emphasize their plasticity and discuss recent findings showing that, rather than functioning merely as passive walls, some of these interfaces can contribute to signaling, environmental responsiveness, and developmental regulation. This highlights their potential relevance as targets for improving crop resilience and as inspiration for biomaterial innovation.
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Authors Gwyneth Christina Ingram, Tonni Grube Andersen
Journal Journal of experimental botany
Year 2026
DOI
10.1093/jxb/erag486
URL
https://doi.org/10.1093/jxb/erag486
Keywords Keywords not found

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