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Synthetic seed as a potential direct delivery system of mass produced somatic embryos in the coastal marsh plant smooth cordgrass (Spartina alterniflora)

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Abstract

A suspension culture capable of producing a high quantity of proembryogenic masses (PEMs) was evaluated to provide adequate support for synthetic seed production in saltmarsh species Spartina alterniflora. Using immature inflorescences, callus was induced on MS medium supplemented with 2 mg 1−1 2,4-dichlorophenoxyacetic acid (2,4-D). Prior to initiation of suspension culture, calli were proliferated on a modified R4 medium (R4+) for 2–4 weeks. Suspension culture was carried out in a liquid General Medium modified by adding FeSO4 · 7H20, myo-inositol, thiamine · HCl, pyridoxine · HCl, and casein acid hydrolysate. Suspension cells were subcultured weekly by replacing the spent medium with fresh medium. The amount of PEMs tripled in 1 week. Cells from suspension culture had an average regeneration rate of 90% for 6 months of culture. About 40 g of PEMs can be harvested from 1 l of suspension culture in a weekly basis. Plated on R4+ medium, these PEMs produced somatic embryos (SEs) that gave rise to 2,000 plantlets. Encapsulation of SEs or microplantlets (MPs) derived from suspension cells may facilitate direct delivery of micro-propagated S. alterniflora to field planting. Evaluated under in vitro conditions, both SEs and MP-derived synthetic seeds had high conversion rates.

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Abbreviations

SE:

Somatic embryo

MP:

Microplantlet

PEM:

Proembryogenic mass

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Correspondence to H. S. Utomo.

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Approved for publication by the Director of the Louisiana Agricultural Experiment Station as manuscript number 07-61-0353.

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Utomo, H.S., Wenefrida, I., Meche, M.M. et al. Synthetic seed as a potential direct delivery system of mass produced somatic embryos in the coastal marsh plant smooth cordgrass (Spartina alterniflora). Plant Cell Tiss Organ Cult 92, 281–291 (2008). https://doi.org/10.1007/s11240-007-9334-0

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