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  • P-ISSN2765-2203
  • E-ISSN2765-2211

Germination Characteristics and Seed Dormancy of Iris dichotoma Pall., an Endangered Species Native to Korea

Proceedings of the National Institute of Ecology of the Republic of Korea, (P)2765-2203; (E)2765-2211
2021, v.2 no.4, pp.229-234
https://doi.org/10.22920/PNIE.2021.2.4.229
Hyeong Bin Park (Division of Restoration Research, Research Center for Endangered Species, National Institute of Ecology)
Byoung-Doo Lee (Division of Restoration Research, Research Center for Endangered Species, National Institute of Ecology)
Chang Woo Lee (Division of Restoration Research, Research Center for Endangered Species, National Institute of Ecology)
Jung Eun Hwang (Division of Restoration Research, Research Center for Endangered Species, National Institute of Ecology)
Hwan Joon Park (Division of Restoration Research, Research Center for Endangered Species, National Institute of Ecology)
Seongjun Kim (Division of Restoration Research, Research Center for Endangered Species, National Institute of Ecology)
Jiae An (Division of Restoration Research, Research Center for Endangered Species, National Institute of Ecology)
Pyoung Beom Kim (Division of Restoration Research, Research Center for Endangered Species, National Institute of Ecology)
Nam Young Kim (Division of Restoration Research, Research Center for Endangered Species, National Institute of Ecology)

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Abstract

Iris dichotoma Pall. found on Daechung Island in Korea has been designated as an endangered species. To aid in conservation efforts of this species, this study investigated its germination characteristics and seed dormancy type. Four sets of seeds were incubated at different temperatures (4/1°C, 15/6°C, 20/10°C, and 25/15°C). One set of seeds was cold stratified (4 weeks at 4/1°C). The final germination rate and mean germination time showed that the optimal germination temperature was 25/15°C. Final germination rates were ~70%, showing no significant difference among temperature treatments. However, mean germination time were significantly different among all temperature treatments except for 4/1°C. Mean germination time for seeds with temperature treatments of 15/6°C, 20/10°C, and 25/15°C were 3.2, 2.1, and 1.5 weeks, respectively. At 25/15°C, the mean germination time was half of that at 15/6°C. Seeds of I. dichotoma had fully developed embryos at the time of dispersal. No additional growth of the embryo was observed. Cold stratification did not affect the final germination rate or the mean germination time. This study shows that seeds of I. dichotoma have no physiological or morphological dormancy, unlike other members of the Iris genus known to have seed dormancy that needs a relatively high incubation temperature (≥25/15°C) for mass propagation to occur. These results will be useful for understanding ecophysiological mechanisms related to the species’ habitat. They are also useful for mass propagation of I. dichotoma for the purpose of conserving this endangered species.

Submission Date
2021-06-25
Revised Date
2021-08-06
Accepted Date
2021-08-10

Proceedings of the National Institute of Ecology of the Republic of Korea