Studies on Geographical Diversity of Floral Morphology of Tea Plant (Camellia sinensis (L.) O.KUNTZE) using the Method of Numerical Taxonomy

Toyao, Tadayuki; Takeda, Yoshiyuki

doi:10.5979/cha.1999.39

Cited by 8 publications

(6 citation statements)

References 2 publications

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“…Floral morphology is useful for the analysis of genetic relationships because of its high heritability, and has been used to evaluate relationships among genetic backgrounds in C. sinensis (Takeda and Toyao 1980;Toyao and Takeda 1999;Chen et al 2005). Therefore, we evaluated each accession for density of pubescence of the ovary, level of style protrusion, number of split style segments, depth of style splitting, and extent of style bending.…”

Section: Phenotyping Of Germplasmsmentioning

confidence: 99%

Worldwide core collections of tea (Camellia sinensis) based on SSR markers

Taniguchi

Kimura

Saba

et al. 2014

Tree Genetics & Genomes

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Tea (Camellia sinensis (L.) O. Kuntze) is the world's most popular beverage crop. However, to date, no core collection has been selected from worldwide germplasm resources on the basis of genotype data. In this study, we analyzed 788 tea germplasm accessions using 23 simple sequence repeat (SSR) markers. Our population structure analysis divided the germplasms into a Japanese group and an exotic group. The latter could be divided into var. sinensis and var. assamica. The genetic diversity was higher in germplasms from China, Taiwan, India, and Sri Lanka than in those from other countries, and low in germplasms from Japan. Using the number of SSR alleles as a measure of genetic diversity, we developed a core collection consisting of 192 accessions and three subcore collections with 96, 48, and 24 accessions. Although the results might be affected by marker-selection bias, the core 192 collection adequately covered the range of variation of the 788 accessions in floral morphology, and the chemical composition of first-flush leaves. These collections will be powerful tools for breeding and genetic research in tea.

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Section: Phenotyping Of Germplasmsmentioning

confidence: 99%

Worldwide core collections of tea (Camellia sinensis) based on SSR markers

Taniguchi

Kimura

Saba

et al. 2014

Tree Genetics & Genomes

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“…sinensis and var. assamica based on morphophysiological [1][2][3]11,16,19,21 and biochemical 7,10 traits. This classification was adopted here, but with a minor change, namely the separation of var.…”

Section: Methodsmentioning

confidence: 99%

Selection of Early Lines without Frost Damage Based on Parameters of Accumulated Temperature for Flushing and Opening Speed of New Leaves in Tea

Omae

Takeda²

2003

JARQ

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Given the demand by farmers for early budding cultivars in tea, this study was carried out to select moderately early lines without frost damage, as well as lines showing rapid growth after flushing among 1,300 tea (Camellia sinensis) accessions preserved at the Makurazaki Station of the National Institute of Vegetable and Tea Science, Japan. A model for flushing and leaf opening [y = (ax+b), y: number of open leaves, x: effective accumulated temperature calculated by integrating values of temperatures being 10°C below the daily minimum air temperature since the date of autumn skiffing and a, b: parameters] was developed before the selection. For the selection, the estimated parameters were used as indicators of the flushing temperature and opening speed of tea leaves. As a result, 120 moderately early lines, 79 rapidly growing lines and 12 lines (parameter a>0.5, x 0 = 145-150°C) with both characteristics were selected. Furthermore, Taiwan-yamacha which showed extremely late flushing characteristics, accounted for 44 of the 68 late flushing lines and is expected to be used as breeding material to extend the harvesting period for the first crop.Discipline: Genetic resources / Plant breeding / Tea industry Additional key words: Camellia sinensis, sensitivity to temperature JARQ 37 (3), 183 -188 (2003) http://www.jircas.affrc

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“…Therefore, in tea, morphological descriptors have been used for characterization [12], genetic diversity and comparison [13,14], cultivar identification [15], and phylogeny and classification studies [16][17][18]. A comprehensive phylogenetic analysis of all genera belonging to the plant family Theaceae was conducted [18].…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that the numerical taxonomy and cladistic analysis based on morphological characters of floral organ are useful in species classification of genus Camellia [11]. Also, the taxonomic position of the wild tea plant (C. sinensis (L.) O. Kuntze forma formosensis Kitamura) was assessed using morphological traits [16] and the potential of the intraspecific classification of tea plant based on the variations of floral morphology and numerical taxonomy was reported [12].…”

Section: Introductionmentioning

confidence: 99%

Floral Diversity and Genetic Structure of Tea Germplasm of Sri Lanka

Ranatunga

Kottawa-Arachchi

Gunasekare³

et al. 2017

International Journal of Biodiversity

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The role of tea germplasm in crop improvement, though well recognized, yet lacks sufficient information depriving its optimum use. About 600 accessions are conserved as tea germplasm in Sri Lanka and only 4% have been frequently utilized in breeding. Floral morphological characters are useful descriptors for preliminary characterization of genetic resources and particularly pistil traits are considered as reliable criteria in taxonomical studies of higher plants. The objectives of the present study were to conduct a comprehensive analysis on floral diversity of tea germplasm to determine the nature and extent of genetic structure of tea germplasm and to categorize accessions into major taxa. Eighty-nine accessions from the tea germplasm were characterized using 16 floral traits. Results indicated presence of considerable variation among germplasm accessions. Accessions were categorized into five different groups based on the diversity of floral traits and highly discriminating accessions were identified based on the grouping pattern. Among the traits, pistil traits were highly variable compared to other traits. Tea germplasm is predominantly represented by Cambod type accessions (68%) followed by Assam types (20%). Availability of China type accessions is low. Gaps in the germplasm collection were identified and information generated can be used for decision making in future germplasm exploration missions and breeding programme.

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Studies on Geographical Diversity of Floral Morphology of Tea Plant (Camellia sinensis (L.) O.KUNTZE) using the Method of Numerical Taxonomy

Cited by 8 publications

References 2 publications

Worldwide core collections of tea (Camellia sinensis) based on SSR markers

Worldwide core collections of tea (Camellia sinensis) based on SSR markers

Selection of Early Lines without Frost Damage Based on Parameters of Accumulated Temperature for Flushing and Opening Speed of New Leaves in Tea

Floral Diversity and Genetic Structure of Tea Germplasm of Sri Lanka

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