Tea Plant (Camellia sinensis) Breeding in Sri Lanka

Gunasekare, M. T. K.

doi:10.1007/978-3-642-31878-8_4

Cited by 13 publications

(7 citation statements)

References 11 publications

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“…assamica and var. sinensis (Gunasekare 2012). The results of our structure analysis and PCoA support this idea, and indicate that some accessions are hybrids between the two varieties.…”

Section: Genetic Diversity and Population Structure Of Tea Germplasm supporting

confidence: 83%

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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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“…assamica and var. sinensis (Gunasekare 2012). The results of our structure analysis and PCoA support this idea, and indicate that some accessions are hybrids between the two varieties.…”

Section: Genetic Diversity and Population Structure Of Tea Germplasm supporting

confidence: 83%

“…Tea plants grown here are thought to have been domesticated directly from wild ancestors (Li 1983). All tea plants grown elsewhere originated in China or India (Gunasekare 2012;Kamunya et al 2012;Tanaka 2012;Ercisli 2012).…”

Section: Introductionmentioning

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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“…More recently, artificial pollination and hybridization among selected tea types or with wild relatives have become an important breeding strategy for modern tea cultivar development (Wachira et al, 1997 ; Sharma et al, 2010 ). To date, over 5,100 accessions of tea germplasm have been selected and conserved in China and India (Chen et al, 2007 ; Das et al, 2012 ; Yao and Chen, 2012 ) and all genetic stocks for most tea growing countries were directly or indirectly introduced from either China or India (Meegahakumbura et al, 2016 ), although some secondary exchange may have occurred between tea producing nations (Gunasekare, 2012 ; Sriyadi et al, 2012 ; Wambulwa et al, 2017 ). Unfortunately, the breeding history of tea germplasm and the extent of exchange of tea genetic resources between China and India remains poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Domestication Origin and Breeding History of the Tea Plant (Camellia sinensis) in China and India Based on Nuclear Microsatellites and cpDNA Sequence Data

Meegahakumbura

Wambulwa

et al. 2018

Front. Plant Sci.

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Although China and India are the two largest tea-producing countries, the domestication origin and breeding history of the tea plant in these two countries remain unclear. Our previous study suggested that the tea plant includes three distinct lineages (China type tea, Chinese Assam type tea and Indian Assam type tea), which were independently domesticated in China and India, respectively. To determine the origin and historical timeline of tea domestication in these two countries we used a combination of 23 nSSRs (402 samples) and three cpDNA regions (101 samples) to genotype domesticated tea plants and its wild relative. Based on a combination of demographic modeling, NewHybrids and Neighbour joining tree analyses, three independent domestication centers were found. In addition, two origins of Chinese Assam type tea were detected: Southern and Western Yunnan of China. Results from demographic modeling suggested that China type tea and Assam type tea first diverged 22,000 year ago during the last glacial maximum and subsequently split into the Chinese Assam type tea and Indian Assam type tea lineages 2770 year ago, corresponding well with the early record of tea usage in Yunnan, China. Furthermore, we found that the three tea types underwent different breeding histories where hybridization appears to have been the most important approach for tea cultivar breeding and improvements: a high proportion of the hybrid lineages were found to be F 2 and BCs. Collectively, our results underscore the necessity for the conservation of Chinese Assam type tea germplasm and landraces as a valuable resource for future tea breeding.

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“…Most of the accessions in the collection resemble China type and there is a high potential for making use of it for the production of green tea (Kottawa-Arachchi et al, 2017). According to the records, only 23 accessions (4% of the total germplasm) have been frequently utilized in tea breeding programmes as parents in the past two decades to develop new cultivars (Gunasekare, 2012). Germplasm activities in the recent past have shifted from collection and conservation efforts towards proper characterization, evaluation and rational utilization of tea germplasm in the current breeding program.…”

Section: Introductionmentioning

confidence: 99%

Recent progress of intra-specific hybridization of tea (<em>Camellia sinensis,</em> (L.) O. Kuntze) in Sri Lanka

2019

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Tea germplasm accessions are the most valuable material for tea breeding. However its utilization in the past was limited due to lack of available information. Recently generated information on genetic structure and metabolite profiles of the germplasm were used in selecting parents for hybridization programmes from 2012 to 2016. The main focus of the programme was to make crosses between three taxa of tea viz. Camellia. sinensis var. assamica (Assam type), C. sinensis var. sinensis (China type) and C. sinensis spp. lasiocalyx (Cambod type). Pollinated buds were closelymonitored and the number of crosses, number of fruits, number of seeds and reproductive parameters were recorded. A total of 3978 crosses (2405 direct crosses and 1573 reciprocal crosses) were made and 974 seeds were obtained from 595 fruits. Percentages of fruit set and seed set varied significantly among different families. Irrespective of the intersubspecies groups, the percentage of seed germination was above 50% and was not significantly-different. Cross compatibility between taxa in terms of percentage of fruit set ranged from 4.6% to 25.6% and varied significantly. Among the inter-subspecies crosses the Assam varieties were found to be the best as female parent. The generated information would be useful for selection of parents and tea improvement programmes in the future.

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Tea Plant (Camellia sinensis) Breeding in Sri Lanka

Cited by 13 publications

References 11 publications

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

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

Domestication Origin and Breeding History of the Tea Plant (Camellia sinensis) in China and India Based on Nuclear Microsatellites and cpDNA Sequence Data

Recent progress of intra-specific hybridization of tea (<em>Camellia sinensis,</em> (L.) O. Kuntze) in Sri Lanka

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