Ponerorchis graminifolia var. suzukiana is a terrestrial orchid that is an endangered species native to Japan, and it germinates more readily in immature seeds than in mature seeds. To preserve this orchid, an efficient protocol was established for the cryopreservation of immature seeds of P. graminifolia var. suzukiana. When immature seeds of 6 weeks after pollination, which showed higher germination and protocorm formation than mature seeds, were precultured on New Dogashima (ND) medium with 0.3M sucrose for 3 days and cryopreserved by vitrification method (treated with PVS2 for 60 min), the viability after preservation as assessed with 2,3,5-triphenyltetrazolium chloride staining test was about 86%. Immature seeds thus treated showed equal rates of germination and protocorm formation to the untreated control immature seeds, and they developed into normal plantlets on ND medium.
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PONERORCHIS GRAMINIFOLIA VAR. SUZUKIANA;
Document Type: Regular Paper
May 1, 2005
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CryoLetters is a bimonthly international journal for low temperature sciences, including cryobiology, cryopreservation or vitrification of cells and tissues, chemical and physical aspects of freezing and drying, and studies involving ecology of cold environments, and cold adaptation
The journal publishes original research reports, authoritative reviews, technical developments and commissioned book reviews of studies of the effects produced by low temperatures on a wide variety of scientific and technical processes, or those involving low temperature techniques in the investigation of physical, chemical, biological and ecological problems.