A 22 570-year record of vegetational and climatic change from Wenhai Lake in the Hengduan Mountains biodiversity hotspot, Yunnan, Southwest China

Yao, Yi‐Feng; Song, Xingyu; Wortley, Alexandra H.; Blackmore, Stephen; Li, C. S.

doi:10.5194/bg-12-1525-2015

Cited by 22 publications

(14 citation statements)

References 30 publications

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“…These results further strengthen the hypothesis of three genetic lineages of the tea plant as proposed in our previous study (Meegahakumbura et al, 2016 ). The divergence time between China type tea and Assam type tea roughly coincides with the last glacial maximum (LGM) (Cook et al, 2011 , 2012 ; Yao et al, 2015 ). During this period, some ancestral populations of China type tea ( C. sinensis var .…”

Section: Discussionmentioning

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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Section: Discussionmentioning

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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“…. and Castanopsis (D. Don) Spach;Yao et al, 2015] in the area, suggesting certain level of climatic stability. Under such scenario, populations would have maintained relatively large sizes while keeping certain levels of gene flow.…”

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confidence: 95%

Population genetic dynamics of Himalayan-Hengduan tree peonies, Paeonia subsect. Delavayanae

Zhang

López‐Pujol

Gong

et al. 2018

Molecular Phylogenetics and Evolution

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According to the present taxonomical treatment, Paeonia subsect. Delavayanae consists of only two species (P. delavayi and P. ludlowii) endemic to the Himalayan-Hengduan Mountains. Although P. ludlowii can be distinguished from P. delavayi on the basis of a series of morphological characters, the species delimitation remains controversial because the more widespread one, P. delavayi, exhibits considerable morphological diversity. Both chloroplast DNA markers and nuclear microsatellites or simple sequence repeats (nSSR) are used herein to reveal genetic diversity and relationships of the two taxa included in this subsection, and ecological niche modeling (ENM) is employed to get insights into their paleodistribution. Our results show that genetic boundaries between the two currently recognized species are unclear, probably due to recent divergence. Paeonia ludlowii is budding from P. delavayi, probably by genetic isolation but also by shifting its niche to the harsher upland Tibetan conditions. Paeonia delavayi itself would be, however, under active speciation, showing significant genetic differentiation and morphological diversity. Whereas P. ludlowii would have endured the Pleistocene glacial periods by in situ persistence in local, small refugia, a 'dual' model seems to apply for P. delavayi (in situ persistence and retreat to refugia). The rarity of P. ludlowii and high evolutionary potential of P. delavayi imply high priority for in situ conservation of both taxa. The Himalayan-Hengduan Mountains are an ideal arena for differentiation within subsect. Delavayanae of Paeonia, by means of expansions/contractions/displacements, vertical migrations, and local survival/extinctions in response to the Neogene climate fluctuations and geological changes.

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“…a Eight pollen diagrams with a relatively high amount of Fagopyrum pollen, which show two expansions of buckwheat in China during the Holocene (Li et al 2006 , 2007 , 2009 ; Yi 2003b ; Makohonienko et al 2008 ; Shang and Li 2010 ; Zhang 2015 ; Yao et al 2013 ). The grey shadow represents the first expansion of buckwheat during 5,000–4,000 bp ; the hollow area represents the second expansion of buckwheat during 1,600–1,000 bp in China; b six pollen diagrams with low percentages of Fagopyrum pollen (Okuda et al 2003 ; Yi et al 2003a ; Makohonienko et al 2004 ; Cheng and Jiang 2011 ; Yao et al 2015 ). Pollen diagrams reproduced from the references above with kind permission of the original authors, editors and publishers …”

Section: Resultsmentioning

confidence: 99%

Buckwheat: a crop from outside the major Chinese domestication centres? A review of the archaeobotanical, palynological and genetic evidence

Hunt

Xue

Jones

2017

Veget Hist Archaeobot

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The two cultivated species of buckwheat, Fagopyrum esculentum (common buckwheat) and F. tataricum (Tartary buckwheat) are Chinese domesticates whose origins are usually thought to lie in upland southwestern China, outside the major centres of agricultural origins associated with rice and millet. Synthesis of the macro-and microfossil evidence for buckwheat cultivation in China found just 26 records across all time periods, of which the majority were pollen finds. There are few or no identifying criteria distinguishing F. esculentum and F. tataricum for any sample type. The earliest plausibly agricultural Fagopyrum occurs in northern China from the mid 6th millennium cal bp. The archaeobotanical record requires reconciliation with biogeographic and genetic inferences of a southwestern Chinese origin for buckwheat. Scrutiny of the genetic data indicates limitations related to sampling, molecular markers and analytical approaches. Common buckwheat may have been domesticated at the range margins of its wild progenitor before its cultivation expanded in the north, mediated by changing ranges of wild species during the Holocene and/or by cultural exchange or movement of early agriculturalists between southwest China, the Chengdu Plain and the southern Loess Plateau. Buckwheat probably became a pan-Eurasian crop by the 3rd millennium cal bp, with the pattern of finds suggesting a route of westward expansion via the southern Himalaya to the Caucasus and Europe.

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A 22 570-year record of vegetational and climatic change from Wenhai Lake in the Hengduan Mountains biodiversity hotspot, Yunnan, Southwest China

Cited by 22 publications

References 30 publications

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

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

Population genetic dynamics of Himalayan-Hengduan tree peonies, Paeonia subsect. Delavayanae

Buckwheat: a crop from outside the major Chinese domestication centres? A review of the archaeobotanical, palynological and genetic evidence

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