Population genetic structure of a thousand rubber tree accessions from wild Rondônia populations conserved in Vietnam

Vu, Van Truong; Lai, Van Lam; Le, Mau Thuy; Huynh, Duc Dinh; Nguyen, Thi Thao; Rivallan, Ronan; Huynh, Van Biet; Guen, Vincent Le

doi:10.1007/s10722-019-00843-0

Cited by 4 publications

(4 citation statements)

References 18 publications

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“…Thus, the cultivated rubber tree genetic background is relatively narrow, having undergone a significant genetic bottleneck. Though there were reports exploring Wickham population structure using SSR markers or by GBS (de Souza et al ., 2018 ; Vu et al ., 2020 ), a more accurate determination by deep resequencing is currently missing. All the published rubber tree genomes belong to Wickham clones (Lau et al ., 2016 ; Liu et al ., 2020 ; Pootakham et al ., 2017 ; Rahman et al ., 2013 ; Tang et al ., 2016 ), and a high‐quality genome assembly from wild rubber tree would provide additional insights, as the Wickham clones went through a genetic bottleneck event during the domestication process.…”

Section: Discussionmentioning

confidence: 99%

Chromosome‐level wild Hevea brasiliensis genome provides new tools for genomic‐assisted breeding and valuable loci to elevate rubber yield

Cheng

Song

et al. 2023

Plant Biotechnology Journal

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Summary The rubber tree (Hevea brasiliensis) is grown in tropical regions and is the major source of natural rubber. Using traditional breeding approaches, the latex yield has increased by sixfold in the last century. However, the underlying genetic basis of rubber yield improvement is largely unknown. Here, we present a high‐quality, chromosome‐level genome sequence of the wild rubber tree, the first report on selection signatures and a genome‐wide association study (GWAS) of its yield traits. Population genomic analysis revealed a moderate population divergence between the Wickham clones and wild accessions. Interestingly, it is suggestive that H. brasiliensis and six relatives of the Hevea genus might belong to the same species. The selective sweep analysis found 361 obvious signatures in the domesticated clones associated with 245 genes. In a 15‐year field trial, GWAS identified 155 marker–trait associations with latex yield, in which 326 candidate genes were found. Notably, six genes related to sugar transport and metabolism, and four genes related to ethylene biosynthesis and signalling are associated with latex yield. The homozygote frequencies of the causal nonsynonymous SNPs have been greatly increased under selection, which may have contributed to the fast latex yield improvement during the short domestication history. Our study provides insights into the genetic basis of the latex yield trait and has implications for genomic‐assisted breeding by offering valuable resources in this new domesticated crop.

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Section: Discussionmentioning

confidence: 99%

Chromosome‐level wild Hevea brasiliensis genome provides new tools for genomic‐assisted breeding and valuable loci to elevate rubber yield

Cheng

Song

et al. 2023

Plant Biotechnology Journal

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“…Between 1961 and 2020, there was a remarkable increase in the global average yield of rubber cultivation, rising from 0.5 to 1.2 tons per hectare, and annual production surged from 2.1 to 14.8 million tons [4]. This increase as achieved through the implementation of advanced agronomic practices, the careful selection of highly productive and diseaseresistant genotypes, the identification of suitable cultivation areas, and the expansion of agricultural land dedicated to rubber tree cultivation [5,6]. The scarcity of other commercial sources of NR offering comparable quality and production capacity has justified research into various aspects of H. brasiliensis cultivation [7,8].…”

Section: Introductionmentioning

confidence: 99%

Performance- and Resistance-Related Early Responses of Colombian Elite Rubber Tree Genotypes under Low Pressure of South American Leaf Blight: Implications for Disease Management in the Amazon

Galindo-Rodríguez,

Sterling,

Muñoz-Ramirez

et al. 2023

Plants

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The cultivation of Hevea brasiliensis, the primary commercial source of natural rubber, is strongly impacted by South American leaf blight (SALB) disease, caused by the fungus Pseudocercospora ulei. Various management strategies have been implemented, including the selection of resistant genotypes and the identification of escape zones. This study evaluated the growth, early yield, and resistance to SALB of nine Colombian elite genotypes from the ECC-100 series and IAN 873 clone (control) in a large-scale clone trial in an area with low SALB pressure in the Colombian Amazon during 2017–2020. Favorable early performance was evident, although there was a significant increase in the severity and sporulation of P. ulei over time, especially in the ECC 35, ECC 60, and IAN 873 genotypes. However, these scores indicate low susceptibility. Genotypes with higher resistance to SALB demonstrated greater growth and early yield compared to more highly susceptible genotypes. The ECC 64, ECC 73, ECC 90, ECC 25, and ECC 29 genotypes were more desirable in low SALB pressure zones due to their higher resistance and early performance. It is important to highlight that this research contributes to the selection of new SALB-resistant Colombian genotypes of H. brasiliensis. However, it is also necessary to evaluate the productivity of these selections in the mature stage and long-term resistance to SALB before recommending and promoting their commercial adoption in the Colombian Amazon.

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“…Worldwide production has increased in the last 30 years as a result of an increase in the rubber agricultural planted area and a large increase in productivity, to which genetic improvement remains a key contributor 3 . The success of crop improvement depends on the extent of genetic diversity available in germplasms as well as information on important traits.…”

Section: Introductionmentioning

confidence: 99%

“…The success of crop improvement depends on the extent of genetic diversity available in germplasms as well as information on important traits. Recently, many studies have been conducted in germplasm banks in countries such as Vietnam 3 , Malaysia 4 , 5 , Nigeria 6 , Sri Lanka 7 , Brazil 8 – 10 and India 11 . Genetic variability studies are crucial for the selection of parents for hybridization 12 .…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity associated with natural rubber quality in elite genotypes of the rubber tree

Sant’Anna

Gouvêa

Martins

et al. 2021

Sci Rep

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The objective of this study was to evaluate the genetic variability of natural rubber latex traits among 44 elite genotypes of the rubber tree [Hevea brasiliensis (Willd. ex Adr. de Juss.) Müell. Arg.]. Multivariate analysis and machine learning techniques were used, targeting the selection of parents that demonstrate superior characters. We analyzed traits related to technological or physicochemical properties of natural rubber latex, such as Wallace plasticity (P0), the plasticity retention index [PRI (%)], Mooney viscosity (VR), ash percentage (Ash), acetone extract percentage (AE), and nitrogen percentage (N), to study genetic diversity. Multivariate [unweighted pair group method with arithmetic means (UPGMA) and Tocher)] and machine learning techniques [K-means and Kohonen’s self-organizing maps (SOMs)] were employed. The genotypes showed high genetic variability for some of the evaluated traits. The traits PRI, Ash, and PO contributed the most to genetic diversity. The genotypes were classified into six clusters by the UPGMA method, and the results were consistent with the Tocher, K-means and SOM results. PRI can be used to improve the industrial potential of clones. The clones IAC 418 and PB 326 were the most divergent, followed by IAC 404 and IAC 56. These genotypes and others from the IAC 500 and 400 series could be used to start a breeding program. These combinations offer greater heterotic potential than the others, which can be used to improve components of rubber latex quality. Thus, it is important to consider the quality of rubber latex in the early stage of breeding programs.

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Population genetic structure of a thousand rubber tree accessions from wild Rondônia populations conserved in Vietnam

Cited by 4 publications

References 18 publications

Chromosome‐level wild Hevea brasiliensis genome provides new tools for genomic‐assisted breeding and valuable loci to elevate rubber yield

Chromosome‐level wild Hevea brasiliensis genome provides new tools for genomic‐assisted breeding and valuable loci to elevate rubber yield

Performance- and Resistance-Related Early Responses of Colombian Elite Rubber Tree Genotypes under Low Pressure of South American Leaf Blight: Implications for Disease Management in the Amazon

Genetic diversity associated with natural rubber quality in elite genotypes of the rubber tree

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