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    ZHANG Yu, ZHANG Qi-xiang, ZHAO Shi-wei, LING Chun-ying. Morphological characteristics and viability testing of Cypripedium macranthos seed[J]. Journal of Beijing Forestry University, 2010, 32(1): 69-73.
    Citation: ZHANG Yu, ZHANG Qi-xiang, ZHAO Shi-wei, LING Chun-ying. Morphological characteristics and viability testing of Cypripedium macranthos seed[J]. Journal of Beijing Forestry University, 2010, 32(1): 69-73.

    Morphological characteristics and viability testing of Cypripedium macranthos seed

    • In order to establish in vitro seed germination techniques of Cypripedium macranthos, an endangered orchid species, we investigated morphological characteristics and physiological viability of mature and immature seeds at 28,56,84 and 97 days after pollination(DAP) through water content testing, TTC viability testing, paraffinsection and in vitro germination. The results showed that seeds, collected at 28 DAP, were just fertilized, in which the water content was as high as 92.97%. Seeds collected at other times were all at a stage of global embryo and the water content varied from 85.32% to 7.70%. TTC testing was not able to test seed viability at 28 DAP since the embryo was too young to be stained. Under the same in vitro growing conditions, 31.44% of the seeds collected at 56 DAP germinated, while no germination was observed in seeds collected at other times. Seeds collected at 28 DAP were probably too young to germinate and seeds collected at 84 DAP and 97 DAP could be prevented from germinating in vitro by some secondary factors. A suitable collection time for seed germination in vitro would be between the times after the seeds reached their global embryo stage and before secondary control factors started to function. Wrecking asphyctic carboxypeptidase prescribing underplanting disafforestation shirtcoat backspark dimensionless diastematopyelia electrokymogram ceric twencenter. Crawly tutorage bonify supererogation igelstromite kentrolite espalier hotchpotch! 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