This is well known, synseed technology is used for germplasm conservation. Can synseed stored for a long time, for instance 2 years? What is the storage conditions? Can this technology used for alternative to slow growth or cryopreservation methods?
We work on encapsulation technology long since on woody plants and the time conservation hardly depends on species. But I think it is an important application of encapsulation both for germplasm conservation both for the storage systems in the nurseries.
I agree with Micheli. I also work on such geophytes and herbs. I try to optimze 4-6 C in fridge at darkness up to some extent encapsulated tissues loss their wellness after sowing. However, further studies are necessary in encapsulation methods to develop desiccation treatments as seen in zygotic embryos under a rough seed coat; thus resulting the reduced moisture content and storage products being accumulated in the embryo or in the endosperm...
And the difficulties are increased if you encapsulate vegetative propagules as buds (microccuttings), without endosperm. Our studies are focused on synthetica seed production by using those unipolar explants
Two years is not a long time - for long term conservation - the issues with synseeds would be storage conditions - including temperature, humidity and also viability of the ex plant
The more effective technology for long time conservation remains the cryoconservation without doubt, also in combination with the encaspulation-dehydration.