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Ecophysiological Mechanisms Underlying Seed Dormancy in Five Genea of Ranunculaceae Native to the Korean Peninsula
한반도 자생 미나리아재비과 5개속 식물의 종자휴면과 생태생리학적 기작

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dc.contributor.advisor김기선-
dc.contributor.authorSEUNG YOUN LEE-
dc.date.accessioned2017-07-13T17:38:49Z-
dc.date.available2017-07-13T17:38:49Z-
dc.date.issued2015-02-
dc.identifier.other000000026162-
dc.identifier.urihttps://hdl.handle.net/10371/121000-
dc.description학위논문 (박사)-- 서울대학교 대학원 : 식물생산과학부, 2015. 2. 김기선.-
dc.description.abstractThe main aim of this study was to explore the diversity of seed germination and seedling emergence strategies in Korean temperate forest herbs and to study the environmental factors regulating germination. Embryo morphology and seed dormancy of two Berberidaceae species (Leontice microrhyncha and Jeffersonia dubia), eight Ranunculaceae species (Adonis amurensis, Aquilegia buergeriana, Pulsatilla tonkangensis, Ranunculus crucilobus, R. franchetii, Thalictrum rochenbrunianum, T. uchiyamai, and T. coreanum), three Melanthiaceae species (Heloniopsis koreana, H. tubiflora, and Trillium tschonoskii), and one Liliaceae species (Erythronium japonicum) were studied, and the types of seed dormancy were classified, and its regulation by phytohormones was discussed. All seeds of 14 species we studied had underdeveloped embryos which occupied about 7-20% of the full seed length at maturity. Most seeds of A. buergeriana and P. tonkangensis had morphological dormancy (MD), whereas the seeds of L. microrhyncha, J. dubia, A. amurensis, R. crucilobus, R. franchetii, E. japonicum, T. tschonoskii, T. coreanum had morphophysiological dormancy (MPD). On the other hand, the seeds of H. koreana, H. tubiflora, T. rochenbrunianum, and T. uchiyamai had both MD and MPD, indicating that there was a different level of dormancy (MD and MPD) within the same seed population examined. Among the 14 species, the types of MPD were classified in seeds of Ranunculaceae. All six species, which had MPD, emerged seedlings mainly in spring after dormancy was broken. However, different dormancy mechanisms to attain this pattern of spring emergence were observed regardless of the time of seed dispersal. Seeds of A. amurensis had a special type of deep simple epicotyl MPD. Embryos grew at relatively warm temperatures in autumn with split pericarp, and seeds germinated after warm followed by cold temperature sequences. GA did not overcome the dormancy. Seeds of R. crucilobus had deep complex MPD. Embryo growth occurred at cold temperature (5oC). Although germination occurred at cold temperature, it was more promoted at warm temperatures after cold stratification. GA did not overcome the dormancy. On the other hand, seeds of R. franchetii had deep simple epicotyl MPD. Embryos in the seeds grew at relatively warm temperature in early autumn, and germination occurred in late autumn. Germinated seeds required cold stratification for seedling emergence. In three Thalictrum species, seeds had non-deep simple MPD. Although embryo growth occurred at low temperatures, it was more promoted when the seeds were transferred from low to high temperatures. Seeds required only a cold stratification to break dormancy, and GA substituted for cold stratification. We collected data of seed dormancy types in Ranunculaceae from available information and compared with congeners in different countries or continents. From the data, we found that there was a wide variety of dormancy types in five genera in Ranunculaceae. However, there were same types of MPD in eastern Asian - North American congeners in the genus Thalictrum with an Arcto-Tertiary distribution pattern. This indicates that identical types of dormancy are evidence that this type of dormancy is at least as old as the Tertiary. MD and MPD were regulated by phytohormones (ABA and GAs). In A. buergeriana seeds (MD), ABA content and sensitivity decreased rapidly, and GA content and sensitivity increased rapidly after burial. On the other hand, in A. amurensis seeds (MPD), ABA content decreased drastically after burial, but GA content did not increase before the seeds experienced temperature changes from high temperatures in summer to medium temperatures in autumn in the natural environment. When underdeveloped embryos grew rapidly in autumn, ABA was non-detectable and GA content increased. After embryo maturation, ABA content increased and GA content decreased at the same time, and thus, the seeds remained ungerminated during cold season in winter. When the seeds started to germinate after cold period in winter, GA content increased rapidly. GA4 played a key role in stimulating embryo growth and germination in both MD and MPD. The changes of GA/ABA ratio were similar to the changes of embryo growth and germination in the buried seeds. These results indicate that MD or MPD in the basal angiosperm taxa also could be controlled by a hormone balance model.-
dc.description.tableofcontentsCONTENTS

ABSTRACT i
CONTENTS v
LIST OF TABLES viii
LIST OF FIGURES ix

GENERAL INTRODUCTION 1
LITERATURE REVIEW 6
Seed Domancy 6
Classification System for Seed Dormancy 6
Control Mechanism of Seed Dormancy by Phytohormones 19
Ecological and Evolutionary Implications of Seed Dormancy 22
Study Species 24
LITERATURE CITED 26

PART I. Phenology of Dormancy Break and Its Mechanisms by Phytohormones in Seeds of Ranunculaceae Species Native to the Korean Peninsula

CHAPTER I. Phenology of Embryo Growth, Seed Germination, and Seedling Emergence of Five Genera of Ranunculaceae Native to the Korean Peninsula

ABSTRACT 40
INTRODUCTION 42
MATERIALS AND METHODS 44
RESULTS 48
DISCUSSION 63
LITERATURE CITED 68

CHAPTER II. Differences of Dormancy Habit between Morphological (MD) and Morphophysiological dormancy (MPD) in Seeds with Underdeveloped Embryos by Phytohormones

ABSTRACT 71
INTRODUCTION 73
MATERIALS AND METHODS 76
RESULTS 81
DISCUSSION 95
LITERATURE CITED 98

PART II. Requirements for Dormancy Break and the Types of Morphophysiological Dormancy (MPD) in Seeds of Ranunculaceae Species Native to the Korean Peninsula

CHAPTER III. Embryo Morphology and Seed Dormancy in 14 Herbaceous Perennial Species Native to the Korean Peninsula

ABSTRACT 103
INTRODUCTION 105
MATERIALS AND METHODS 108
RESULTS 112
DISCUSSION 122
LITERATURE CITED 126

CHAPTER IV. Dormancy Types and Germination in Seeds of Five Genera of Ranunculaceae Native to the Korean Peninsula in Relation to Temperature and Gibberellic Acid

ABSTRACT 130
INTRODUCTION 132
MATERIALS AND METHODS 135
RESULTS 146
DISCUSSION 184
LITERATURE CITED 190

CONCLUSION 196
ABSTRACT IN KOREAN 202
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dc.formatapplication/pdf-
dc.format.extent4794069 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectBerberidaceae-
dc.subjectecophysiology-
dc.subjectLiliaceae-
dc.subjectMD-
dc.subjectMelanthiaceae-
dc.subjectMPD-
dc.subjectphytohormones-
dc.subjectRanunculaceae-
dc.subjectseed dormancy-
dc.subjectunderdeveloped embryo-
dc.subject.ddc633-
dc.titleEcophysiological Mechanisms Underlying Seed Dormancy in Five Genea of Ranunculaceae Native to the Korean Peninsula-
dc.title.alternative한반도 자생 미나리아재비과 5개속 식물의 종자휴면과 생태생리학적 기작-
dc.typeThesis-
dc.contributor.AlternativeAuthor이승연-
dc.description.degreeDoctor-
dc.citation.pages204-
dc.contributor.affiliation농업생명과학대학 식물생산과학부-
dc.date.awarded2015-02-
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College of Agriculture and Life Sciences (농업생명과학대학)Dept. of Plant Science (식물생산과학부)Theses (Ph.D. / Sc.D._식물생산과학부)
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