The nutlet morphology of the Genus Glechoma L. (Lamiaceae) and its related taxa

Jang, Tae Soo; Hong, Suk Pyo

doi:10.11110/kjpt.2010.40.1.050

Cited by 2 publications

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“…The Glechoma species investigated here show micro- and macromorphological similarity, a uniform basic chromosome number and the same level of polyploidy [15–16, 21, 23]. However, the species exhibit variation in the number and distribution of rDNA loci and in their genome sizes.…”

Section: Discussionmentioning

confidence: 99%

“…The variability of 35S rDNA sites suggests that the polyploid genomes in Glechoma are still in genomic flux [65]. Genome sizes and rDNA locus variation might provide characters to support species delimitation within Glechoma , since morphological diagnostic features are particularly weak [15–16, 21–23]. …”

Section: Discussionmentioning

confidence: 99%

“…biondiana , and G . sinograndis are only subtly differentiated by morphology [16] and micromorphology [15, 21–23] so only four major species— G . grandis , G .…”

Section: Introductionmentioning

confidence: 99%

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rDNA Loci Evolution in the Genus Glechoma (Lamiaceae)

et al. 2016

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Glechoma L. (Lamiaceae) is distributed in eastern Asia and Europe. Understanding chromosome evolution in Glechoma has been strongly hampered by its small chromosomes, constant karyotype and polyploidy. Here phylogenetic patterns and chromosomal variation in Glechoma species are considered, using genome sizes, chromosome mapping of 5S and 35S rDNAs by fluorescence in situ hybridisation (FISH), and phylogenetic analyses of internal transcribed spacers (nrITS) of 35S rDNA and 5S rDNA NTS sequences. Species and populations of Glechoma are tetraploid (2n = 36) with base chromosome number of x = 9. Four chromosomes carry pericentric 5S rDNA sites in their short arms in all the species. Two to four of these chromosomes also carry 35S rDNA in subterminal regions of the same arms. Two to four other chromosomes have 35S rDNA sites, all located subterminally within short arms; one individual possessed additional weak pericentric 35S rDNA signals on three other chromosomes. Five types of rDNA locus distribution have been defined on the basis of 35S rDNA variation, but none is species-specific, and most species have more than one type. Glechoma hederacea has four types. Genome size in Glechoma ranges from 0.80 to 0.94 pg (1C), with low levels of intrapopulational variation in all species. Phylogenetic analyses of ITS and NTS sequences distinguish three main clades coinciding with geographical distribution: European (G. hederacea–G. hirsuta), Chinese and Korean (G. longituba), and Japanese (G. grandis). The paper presents the first comparative cytogenetic analyses of Glechoma species including karyotype structure, rDNA location and number, and genome size interpreted in a phylogenetic context. The observed variation suggests that the genus is still in genomic flux. Genome size, but not rDNA loci number and distribution, provides a character for species delimitation which allows better inferences of interspecific relationships to be made, in the absence of well-defined morphological differentiation.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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rDNA Loci Evolution in the Genus Glechoma (Lamiaceae)

et al. 2016

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“…obs.). 비록 잎 표피 미세구조학적 형질 (Jang and Hong, 2007), 소견과의 형태학적 형질 (Jang and Hong, 2010a), 화 분학적 형질(Jang and Hong, 2010b)등이 긴병꽃풀속 내에 서 종간 큰 차이를 나타내지 않았으나, 핵 리보솜 DNA의 ITS 염기서열에 의하면 71%의 부트스트랩 값으로 G. hirsuta는 G. hederacea와는 다른 독립된 분류군임을 지지 해 주었다 (Fig. 2).…”

Section: 결과 및 고찰unclassified

“…Bég.는 이탈리아의 Sardinia 지역과 Corsica 지역에 제한되어 분포하는 고유종이나 (Ballero et al, 1997;Usai et al, 2003) (Lee, 2003;Lee, 2006;Suh, 2007;Jang, 2008 (Baldwin et al, 1995;Gadek et al, 1996), 경제식물로서 중요한 꿀풀과 식물에 관한 활 발한 연구가 이루어지고 있다 (Steane et al, 1999;Ruiz et al, 2001;Zhong et al, 2010 (Hong et al, 1998;Moon and Hong, 2004;Ojeda et al, 2009;Barone Lumaga et al, 2012). 최근 긴병꽃 풀속과 근연 분류군에 대한 잎 표피 미세구조학적 연구 (Jang and Hong, 2007), 소견과의 외부 형태 및 미세 형태에 관한 연구 (Jang and Hong, 2010a), 화분학적인 연구(Jang (Lee et al, 2002). 염기서열 분석은 Clustal X program (Thompson et al, 1997) 을 이용하여 실행한 후 육안으로 세부정렬을 최종적으로 확인하였다.…”

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A systematic study of Glechoma L. (Lamiaceae) based on micromorphological characters and nuclear ribosomal ITS sequences

Jang¹,

Lee²,

Hong³

2014

Korean Journal of Plant Taxonomy

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The petal and sepal micromorphology of five species of Glechoma (Lamiaceae) was investigated to evaluate their taxonomic significance, and a molecular phylogeny using the sequences of internal transcribed spacers (ITS) regions of nuclear ribosomal DNA was carried out to resolve their phylogenetic relationships. Stomatal complexes were mostly found in the inner and outer part of the sepal from all investigated taxa, and the size length of the guard cell was variable among the taxa. Five types of trichomes (uni-cellular non-glandular trichome, multi-cellular nonglandular trichome, short-stalked capitate glandular trichome, long-stalked capitate glandular trichome, and peltate glandular trichome) were variable among the taxa as well as their distribution and density. In molecular phylogenetic studies, the genus Glechoma was composed of three geographically distinct major monophyletic groups (Europe-U.S.A., China-Korea, Japan). G. longituba in Korea and China formed well-supported monophyletic group. G. hederacea in Europe and U.S.A. formed a monophyletic and well-supported clade with G. sardoa, which are endemic species in Italy, with G. hirsuta falling as a sister to this clade. However, G. grandis did not form any phylogenetic relationships with the remaining taxa. The ITS analyses provided taxonomic boundaries of taxa in Glechoma although the petal and sepal micromorphological characters provided weak evidences of the systematic value. As further studies, incorporating more DNA regions to the matrix including other additional morphological analysis will be significant to provide clearer taxonomic structure in Glechoma.

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The nutlet morphology of the Genus Glechoma L. (Lamiaceae) and its related taxa

Cited by 2 publications

References 0 publications

rDNA Loci Evolution in the Genus Glechoma (Lamiaceae)

rDNA Loci Evolution in the Genus Glechoma (Lamiaceae)

A systematic study of Glechoma L. (Lamiaceae) based on micromorphological characters and nuclear ribosomal ITS sequences

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