Agricultural Sciences: Techniques and Innovations Vol. 12

Synthetic seed technology seeks to convert clonally propagated plant material into discrete, handleable propagules that can be stored, transported and established with some of the operational advantages of true seed. The concept began with encapsulated somatic embryos but has expanded to shoot tips, axillary buds, nodal segments, microshoots, protocorm-like bodies and other regenerable tissues. This critical narrative review evaluates how that expansion has altered the biological meaning, engineering requirements and practical expectations of the technology. Literature from 1982 to 10 June 2026 was identified through accessible scholarly sources and citation tracing, with emphasis on peer-reviewed studies whose bibliographic identity and relevance could be verified. Evidence indicates that calcium-alginate encapsulation remains the dominant platform because ionotropic gelation is mild, inexpensive and readily adjustable, yet a capsule that is morphologically satisfactory is not necessarily biologically competent. Conversion depends jointly on propagule developmental state, matrix composition, mineral nutrition, plant growth regulator history, gas and water exchange, storage environment and the need for post-encapsulation rooting. Somatic embryos retain the closest functional analogy to zygotic seeds, whereas non-embryogenic propagules broaden genotype coverage but frequently preserve dependence on tissue-culture steps. Short- to medium-term storage is feasible in many species, but optimum temperature is not consistently low, and long-duration retention of conversion capacity remains strongly species- and protocol-dependent. Molecular-marker studies generally report clonal similarity after encapsulation, although reliance on limited RAPD or ISSR sampling constrains conclusions about genomic and epigenomic stability. The principal translational weakness is therefore not the ability to form beads, but the absence of standardised quality attributes linking capsule mechanics, physiological state, conversion probability, storage life, sanitation and cost. Future progress requires quality-by-design experiments, sensitive stability assays, non-sterile or direct-sowing validation, automation, and multi-laboratory performance testing. Synthetic seeds are best regarded as a configurable clonal propagule-delivery system rather than a universal replacement for botanical seed.