Germination Characteristics and Seed Dormancy of Iris dichotoma Pall., an Endangered Species Native to Korea
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
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.
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.
참고문헌 (18)
- Baskin, C. C., "Seeds: ecology, biogeography, and, evolution of dormancy and germination" (1998), Academic Press
- Baskin, J. M., "A classification system for seed dormancy", Seed Science Research, 14, pp.166~ (2004)[DOI]
- Demir, I., "Mean germination time of pepper seed lots(Capsicum annuum L. )predicts size and uniformity of seedlings in germination tests and transplant modules", Seed Science and Technology, 36(1), pp.21~30 (2008)[DOI]
- Demirkaya, M., "Effects of osmotic conditioning treatments at different temperatures on mean germination time and rate of heliotro pium greuteri", Journal of Biological &Environmental Sciences, 14(40), pp.1~3 (2020)
- Finch-Savage, W. E., "Seed dormancy and the control of germination", New Phytologist, 172, pp.501~523 (2006)[DOI]
- Geneve, R. L., "Impact of temperature on seed dormancy", HortScience, 38(3), pp.336~341 (2003)[DOI]
- Hajyzadeh, M., "Breaking of seed dormancy in iris suaveolens boiss. Et reuter under in vitro conditions", Acta Scientiarum Polonorum Hortorum Cultus, 18(4), pp.15~24 (2019)[DOI]
- Hidayati, S. N., "Dormancy-breaking and germination requirements of seeds of four Lonicera species(Caprifoliaceae)with underdeveloped spatulate embryos", Seed Science Research, 10(4), pp.459~469 (2000)[DOI]
- Kang, H. S., "Are the conservation areas sufficient to conserve endangered plant species in Korea?", Journal of Ecology and Environment, 33(4), pp.377~389 (2010)[DOI]
- Lashkarian, G., "Seed dormancy breaking evaluation of two subspecies seashore Iris, Iranian Native, through in vitro culture", Journal of Agriculture and Food Technology, 2(3), pp.56~60 (2012)
- 이수광, "종자저장방법 및 차광처리가 희귀식물 대청부채와 부채붓꽃의 발아와 유묘생육에 미치는 영향", 한국산림과학회지, 104(1), pp.60~66 (2015), 한국산림과학회[DOI]
- Martin, A. C., "The comparative internal morphology of seeds", The American midland naturalist, 36, pp.513~660 (1946)[DOI]
- Matthews, S., "Mean germination time as an indicator of emergence performance in soil of seed lots of maize(Zea mays)", Seed Science and Technology, 34(2), pp.339~347 (2006)[DOI]
- "National list of species of Korea" (2021)[URL]
- Nikolaeva, M. G., "On criteria to use in studies of seed evolution", Seed Science Research, 14(4), pp.315~320 (2004)[DOI]
- 박형빈, "Ecophysiology of seed dormancy and germination in four Lonicera (Caprifoliaceae) species native to Korea", Journal of Ecology and Environment, 43(2), pp.254~262 (2019), 한국생태학회[DOI]
- 송수정, "자생 개불알풀속(Veronica) 8종의 온도에 따른 발아반응과 종간 차이", 원예과학기술지, 37(1), pp.20~31 (2019), 한국원예학회[DOI]
- Sun, Y. C., "NaOH scarification and stratification improve germination of Iris lactea var. chinensis seed", HortScience, 41(3), pp.773~774 (2006)[DOI]