Nuclear microsatellites reveal the genetic architecture and breeding history of tea germplasm of East Africa
Wambulwa, M. C.1,2,3,4; Meegahakumbura, M. K.1,2,3,5; Chalo, R.6; Kamunya, S.6; Muchugi, A.4; Xu, J. C.7; Liu, J.1; Li, D. Z.1,2,3; Gao, L. M.1
2016-02-01
发表期刊TREE GENETICS & GENOMES
卷号12期号:1
摘要Tea is the most popular non-alcoholic beverage worldwide and is one of the most important tree cash crops in East Africa. However, no comprehensive study has been carried out on the genetic structure and diversity of tea germplasm for this region to date. In the present study, 193 tea accessions held at the ex situ Germplasm Bank of the Tea Research Institute (TRI), Kenya, were analysed using genetic data from 23 polymorphic simple sequence repeat (SSR) loci. A total of 266 alleles were detected with the number of alleles per locus ranging from 4 to 19 with an average of 7.88. Genetic clustering by STRUCTURE was used to correct misidentified accessions based on morphological characters. After reassignment of the tea accessions, Camellia assamica exhibited the lowest genetic diversity (Hs=0.648) despite being the most widely cultivated tea type in the East African region. C. assamica subsp. lasiocalyx showed the highest genetic diversity (Hs=0.76), which supported its origin by hybridization among tea types. Tea cultivars cultivated across the region exhibited lower genetic diversity (Hs=0.661) compared to material held at the ex situ Germplasm Bank of TRI. Tea accessions clustered in the neighbour-joining tree on the basis of geographical origin, pedigree and leaf pigmentation, indicating their common origin. Our results indicated further that East African tea germplasm has a complex breeding history with a majority of the hybrids being F2 generation and backcross plants. C. assamica contributed significantly more genetic materials in the tea breeding programmes in East Africa. This study highlights the importance of ex situ germplasm banks to conserve the highest genetic diversity, which is an important resource for future tea crop improvements in East Africa.
关键词Camellia Sinensis East Africa Genetic Diversity Nuclear Microsatellites Tea Breeding
DOI10.1007/s11295-015-0963-x
收录类别SCI
语种英语
WOS记录号WOS:000371329700006
引用统计
文献类型期刊论文
条目标识符http://ir.kib.ac.cn/handle/151853/25997
专题中国科学院东亚植物多样性与生物地理学重点实验室
作者单位1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Divers & Biogeog East Asia, Kunming 650201, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Kunming Inst Bot, Germplasm Bank Wild Species Southwest China, Kunming 650201, Peoples R China
4.World Agroforestry Ctr, Nairobi 30677, Kenya
5.Coconut Res Inst, Lunuwila, Sri Lanka
6.Kenya Agr & Livestock Res Org, Tea Res Inst, Kericho 820, Kenya
7.China & East Asia Node, World Agroforestry Ctr, Kunming, Peoples R China
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Wambulwa, M. C.,Meegahakumbura, M. K.,Chalo, R.,et al. Nuclear microsatellites reveal the genetic architecture and breeding history of tea germplasm of East Africa[J]. TREE GENETICS & GENOMES,2016,12(1).
APA Wambulwa, M. C..,Meegahakumbura, M. K..,Chalo, R..,Kamunya, S..,Muchugi, A..,...&Gao, L. M..(2016).Nuclear microsatellites reveal the genetic architecture and breeding history of tea germplasm of East Africa.TREE GENETICS & GENOMES,12(1).
MLA Wambulwa, M. C.,et al."Nuclear microsatellites reveal the genetic architecture and breeding history of tea germplasm of East Africa".TREE GENETICS & GENOMES 12.1(2016).
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