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RISS 인기검색어
- 검색키워드
- 발행기관 : G. Fischer Verlag (검색결과 4 건)
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Jang, T.S.,Moon, H.K.,Hong, S.P. G. Fischer Verlag 2015 FLORA -JENA- Vol.215 No.-
We investigated phenotypic expression and floral dimorphism in Agastache rugosa, a gynodioecious perennial herb, in five Korean populations. Three phenotypes, based on their reproductive characteristics, were found: plants with hermaphrodite flowers (male fertile); plants with female flowers (male sterile); and an intermediate phenotype, which had both hermaphrodite and female flowers within the same inflorescence. Most populations consisted of hermaphrodite and female individuals, together with the intermediate phenotype. Floral dimorphisms were found in nearly all the organs studied, including the corolla, calyx, and stamen, but not between the gynoecium of hermaphrodite and female flowers. Hermaphrodite flowers always had larger floral parts than those of the female and intermediate phenotype. Although there were no significant nutlet size differences between sexual types, nutlet weight was consistently greater in females than in hermaphrodites. Hermaphrodite flowers possessed a high proportion of fertile pollen grains, whereas in the intermediate phenotype, there was either the same amount of sterile and fertile grains or there were more sterile than fertile grains. The differences in the quality and quantity of pollen grains between the hermaphrodite and intermediate phenotype may reflect a trade-off between male and female function. These results indicate that intermediate flowers may be a transitional sexual morph toward female flowers.
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Comparative biogeography of the congener lilies Lilium distichum and Lilium tsingtauense in Korea
Chung, M.Y.,Lopez-Pujol, J.,Chung, M.G. G. Fischer Verlag 2014 FLORA -JENA- Vol.209 No.8
The main Korean mountain range (the so-called ''Baekdudaegan''), which stretches from north to south across most of the Peninsula, has been thought to harbor glacial refugia for boreal and temperate plant species, where they likely found relatively stable habitats and maintained large population sizes. Under this scenario, high levels of genetic variation for plant populations can be anticipated. To test this hypothesis, we examined levels of allozyme diversity in the boreal herb Lilium distichum, which in Korea occurs largely along the Baekdudaegan and in its closely related congener L. tsingtauense, a temperate species that can occur from the coastal islands to high-altitude mountains in the Baekdudaegan. As expected, L. distichum harbored high levels of genetic variation within populations, and we found significant correlations between percentage of polymorphic loci (and allelic richness) and elevation. For L. tsingtauense we found moderate genetic variation, with its populations showing a significantly positive correlation between intra-population expected heterozygosity and elevation. Our results suggest that populations/species that occur within or near the main ridge of the Baekdudaegan probably endured the glacial periods in macrorefugia, whereas those populations/species located at low elevations (far away from mid- and high-elevation mountains) did it in microrefugia. Palaeodistribution modelling is in agreement with genetic data, indicating that the Baekdudaegan was suitable habitat for both species during the glacial (LGM) and interglacial periods (like the present). This study as well as the data from other studies compiled here provides strong evidence that the Baekdudaegan was a major refugial area for the East Asian flora throughout the Quaternary and, thus, meriting high priority for conservation biogeography.
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Seed morphology of the subfamily Helleboroideae (Ranunculaceae) and its systematic implication
Ghimire, B.,Jeong, M.J.,Choi, G.E.,Lee, H.,Suh, G.U.,Heo, K.,Ku, J.J. G. Fischer Verlag 2015 FLORA -JENA- Vol.216 No.-
A comprehensive morphological and anatomical study was carried out on seeds of 28 species from three tribes and eight genera of subfamily Helleboroideae (Aconitum, Actaea, Caltha, Cimicifuga, Delphinium, Eranthis, Megaleranthis and Trollius) and two putatively related genera in Ranunculaceae (Adonis and Ranunculus) using scanning electron and light microscopy to evaluate seed characteristics for use in the examination of systematic relationships. Considerable differences were found in seed coat morphology and anatomy both among and within genera of the subfamily. There are four major types of seed coat surface: striate, lineate, colliculate and irregularly wrinkled. The shape of testal cells was either elongated rectangular, rectangular chiseled, irregular or polygonal to subpolygonal. The wall ornamentation was predominantly smooth and either without any ornamentation or having finely granulated or some ribbon like appendages. The mechanical layer of the seed coat was of the exotestal type except in all species of Eranthis, in which the seed coat mechanical layer was absent; such a seed coat was referred to as being an 'undifferentiated seed-coat'. Maximum parsimony analysis of morphological features establishes three groupings within the studied genera: Aconitum/Delphinium, Actaea/Cimicifuga, and Caltha/Eranthis/Trollius/Megaleranthis. This study is congruent with the earlier groupings of the Helleboroideae based on morphology and also agrees in part with recent molecular studies. Our data convincingly support a close relationship between Caltha-Trollius-Megaleranthis and between Actaea and Cimicifuga. Another group supported strongly by the results of this study is Aconitum-Delphinium.
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Chung, M.Y.,Lopez-Pujol, J.,Chung, J.M.,Kim, K.J.,Park, S.J.,Chung, M.G. G. Fischer Verlag 2015 FLORA -JENA- Vol.213 No.-
Lilium lancifolium, the tiger lily, constitutes a polyploid complex with both diploids (reproduced by seeds and bulbils) and triploids (propagated exclusively via bulbils). An autopolyploid origin for the triploid forms has been previously suggested based on classical cytogenetics, chromosome mapping techniques, ecological data, and geographic distribution in their native range (Korea and the Japanese Tsushima Island). Using 13 allozyme loci, we comparatively assessed clonal structure and levels of genetic diversity in four diploid and 11 triploid populations in South Korea to test the autopolyploid origin of the triploid cytotype and to infer which seedling recruitment strategy is operating within the diploid populations. We also employed ecological niche modeling and multivariate analysis to determine whether triploids of L. lancifolium occupy different and broader niches to those of diploids in Korea and Tsushima Island. The diploids harbored higher levels of within-population genetic diversity than triploids, and allele profiles found in triploids were exactly subsets of those in diploids. Repeated seedling recruitment was inferred for the diploids, whereas all the studied triploid populations were monoclonal since there is no seedling (sexual) recruitment. Although we found no niche divergence between cytotypes of L. lancifolium, the triploids have a broader niche breadth. Genetic data further confirm the autotriploid origin of L. lancifolium, and the lack of a clear, strong evidence for niche divergence between cytotypes of L. lancifolium supports the view that ecological differentiation is not a pre-requisite for the establishment of new polyploid lineages.
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