Methods for preserving viability of plant tissues such as plant embryos are provided herein. Also included are methods for storing genomic DNA and/or molecular marker assay materials in an oil bilayer as part of a high-throughput molecular characterization system. Moreover, plant embryos may be treated while in an oil matrix. The treatment may include chromosome doubling, Agrobacterium-mediated transformation, or herbicide selection as part of an embryo rescue process.
