Scientific glossarySource–sinkIt is the conceptual model used in plant physiology to describe where resources come from — the source, typically a mature leaf actively photosynthesizing — and where they head — the sink, actively growing tissue, something worth being clear on before going further.Origin: Yolia LibraryExact route: /biblioteca?ruta=glosario/fuente-sumidero FULL TOPICSource–sink Name and classification Source-sink. Conceptual model used in plant physiology to describe where resources come from and where they're headed within the plant, central within Yolia's complete catalog, present in Yolia's complete classification system. What it is It is the conceptual model used in plant physiology to describe where resources come from — the source, typically a mature leaf actively photosynthesizing — and where they head — the sink, actively growing tissue, something worth being clear on before going further. Where and how it was studied Documented as a fundamental conceptual framework of modern plant physiology, widely used to explain and predict the movement of sugars and other resources within the complete structure of a developing plant, consistently documented in the available literature. Why it matters for cultivation It is the unifying conceptual model behind almost all the catalog's transport- and replenishment-oriented modules — they all work to support this same flow of resources from producing sources to consuming sinks, relevant for making better crop management decisions. Chemistry — mechanism A mature leaf that actively photosynthesizes acts as a source, exporting produced sugars to actively growing tissue that acts as a sink, such as a developing flower or a new root that does not yet photosynthesize, a mechanism characterized in detail in specialized studies. Mechanism of action Sugars produced in excess at the source are loaded into the phloem, the transport tissue, and actively move toward the sink of greatest relative demand at that moment in the whole plant's development, a stage that occurs in coordination with the rest of the system. Where it occurs in the plant It occurs through the phloem, a vascular tissue specialized in transporting sugars, connecting every producing source with every consuming sink throughout the entire physical structure of the actively developing plant, under the typical conditions of a well-managed home crop. How it's regulated It's regulated according to the relative demand of each sink at a given moment — a high-demand sink, such as a flower in full development, proportionally attracts more resources than a sink with relatively lower demand, dynamically according to the physiological state at the time. What triggers/affects it The presence of actively growing tissue with high metabolic demand, such as a developing flower or a new root, triggers the priority pull of resources from the available sources toward that specific sink, a condition that tends to coincide with visible changes in the plant. Which other processes it interacts with With phloem, this model's central transport tissue, and with practically every replenishment module in the catalog, which precisely seek to support the efficient flow of resources from source to priority sink, a relationship documented within Yolia's complete catalog. Relevant differences between catalog species The principle is identical across the catalog's 4 species; what varies is which specific organ acts as the priority sink depending on the particular development stage, with the flower being priority during active flowering, a nuance relevant to the grower managing more than one species. How it's observed in practice It is observed indirectly through the vigorous growth of the priority sink tissue, such as a developing flower or fruit, compared with the relatively slower growth of the source tissue that is exporting its resources, something noticeable with careful and constant observation of the crop. What happens if it's severe Without sufficiently active sources, such as mature leaves photosynthesizing efficiently, the sinks with greatest demand, such as a developing flower, may receive less resources than they need for optimal development, an outcome that negatively affects overall performance achieved. How Yolia uses it It is the unifying conceptual model behind almost all the catalog's transport- and replenishment-oriented modules — they all work to support this same flow of resources from producing sources to consuming sinks, part of the reasoning Yolia's decision engine follows. Common interpretation errors Thinking that all the plant's tissues receive resources equally — in reality sinks with greater relative demand proportionally attract more resources, reflecting a prioritized allocation of sugar transport, a frequent point of confusion among growers worth clarifying. Evidence and limits of current knowledge The source-sink model is very well established in modern plant physiology; the exact detail of how each sink is prioritized in situations of simultaneous competition remains subject to active scientific study, although fine details remain that science continues to study. Related topics and modules Phloem, the central transport tissue of this model — Cell turgor, a mechanism related to sugar transport — Fruit development, a concrete example of a priority sink within the complete catalog, see also the directly related modules and concepts. Related topicsPhenologyFileObjectiveRiskCompatibilityModule