Short-term in vitro storage of t Miscanthus x ogiformis Honda 'Giganteus' as affected by medium composition, temperature, and photon flux density
Tóm tắt
Miscanthus x ogiformis Honda 'Giganteus' shoot cultures were stored in vitro on proliferation or rooting medium for up to 27 weeks at temperatures of 8, 12, 16, or 20 °C and photosynthetic photon flux densities of 5, 10, or 20 µmol m−2 s−1. Plants survived storage much better on rooting medium than on proliferation medium. Plants stored on rooting medium for 1 week survived well when survival was assessed immediately after storage or after 14 days of acclimatization, but had the lowest survival 28 days after transplantation. With increasing storage period on rooting medium increasing survival was found 28 days after transplantation. This was probably a result of the development of rhizomes and/or roots during storage. Best survival was observed at 20 µmol m−2 s−1 and a temperature of 8-16 °C. Increasing the temperature to 25 °C during the last week of storage improved survival considerably. Root formation was slow at 8 °C, but after 27 weeks of storage the rooting percentage was the same at all storage temperatures. An increasing number of shoots per plant 28 days after transplantation was found with increasing PPFD during storage.Miscanthus shoot cultures can be stored in vitro for at least 27 weeks with limited losses when stored on rooting medium at 20 µmol m−2 s−1, a temperature of 16 °C, and given a 1-week end-of-storage treatment of 25 °C.
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