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- P-ISSN2765-2203
- E-ISSN2765-2211
- KCI Candidate
Germination Characteristics and Seed Dormancy of Iris dichotoma Pall., an Endangered Species Native to Korea
Germination Characteristics and Seed Dormancy of Iris dichotoma Pall., an Endangered Species Native to Korea
LeeByoung-Doo(Byoung-Doo Lee) (Division of Restoration Research, Research Center for Endangered Species, National Institute of Ecology)
LeeChang Woo(Chang Woo Lee) (Division of Restoration Research, Research Center for Endangered Species, National Institute of Ecology)
HwangJung Eun(Jung Eun Hwang) (Division of Restoration Research, Research Center for Endangered Species, National Institute of Ecology)
ParkHwan Joon(Hwan Joon Park) (Division of Restoration Research, Research Center for Endangered Species, National Institute of Ecology)
KimSeongjun(Seongjun Kim) (Division of Restoration Research, Research Center for Endangered Species, National Institute of Ecology)
AnJiae(Jiae An) (Division of Restoration Research, Research Center for Endangered Species, National Institute of Ecology)
KimPyoung Beom(Pyoung Beom Kim) (Division of Restoration Research, Research Center for Endangered Species, National Institute of Ecology)
KimNam Young(Nam Young Kim) (Division of Restoration Research, Research Center for Endangered Species, National Institute of Ecology)
초록
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.
- keywords
- Ecophysiology, Final germination rate, Mass propagation, Mean germination time, Seed morphology
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.
- keywords
- Ecophysiology, Final germination rate, Mass propagation, Mean germination time, Seed morphology
- 투고일Submission Date
- 2021-06-25
- 수정일Revised Date
- 2021-08-06
- 게재확정일Accepted Date
- 2021-08-10
- 다운로드 수
- 조회수
- 0KCI 피인용수
- 0WOS 피인용수