Directing salt excretion in the Gaz plant towards woody fruits: A conceptual framework for plant-based salt harvesting, saline soil remediation, and future luxury and space applications.

Soil salinity is one of the most critical challenges limiting agricultural productivity and ecosystem restoration in arid and semi‑arid regions. Halophytic plants such as Tamarix naturally tolerate high salinity by actively excreting excess salt through specialized leaf glands; however, this mechanism merely redistributes salt back to the soil surface rather than removing it from the system. This conceptual study proposes a novel biological redirection of salt management in Tamarix, shifting salt transport from leaf‑level excretion toward sequestration within a newly defined woody fruit‑like organ. In this framework, absorbed sodium and chloride ions are actively accumulated in a sacrificial, lignified storage organ, where increasing salinity eventually triggers senescence and dehydration, leaving behind a solid salt‑rich structure that can be physically harvested. Beyond its role in saline soil remediation and phytoremediation, this work introduces the idea of plant‑derived salt as a bio‑origin product. The salt‑containing woody fruit is envisioned not only as an environmental tool but also as a potential future luxury good, where consumers may seek the unique experience of tasting salt naturally produced and concentrated inside a plant organ—at least once in their lifetime—due to its symbolic, ecological, and narrative value. Furthermore, this concept opens a new perspective for space biology and long‑duration space missions, where such salt‑accumulating plant organs could serve as a renewable, low‑energy source of dietary salt for astronauts, produced entirely through biological processes without conventional mining or industrial refining. This framework redefines halophytic plants from salt excretors into salt accumulators, establishing a new functional category of bio‑engineered plants at the intersection of plant physiology, environmental biotechnology, sustainable resource recovery, and future human habitats on Earth and beyond.