The Reyan 7-33-97 Rubber Tree Genome: Insight into Its Structure, Composition and Application

Cheng, Hongsheng; Tang, Chaorong; Hong, Huang

doi:10.1007/978-3-030-42258-5_2

Cited by 3 publications

(2 citation statements)

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“…Though the natives of the West Indies used NR for thousands of years, natural rubber industrial applications were discovered less than two centuries ago (Priyadarshan, 2017 ). Henry Wickham collected 70 000 seeds from Brazil in 1876 and sent the germinated seedlings to Asia (Cheng et al ., 2020 ). Following this event, rubber trees were hastily disseminated and domesticated.…”

Section: Introductionmentioning

confidence: 99%

“…Due to high heterozygosity, rubber tree breeding efforts started in 1918 only after the vegetative propagation procedure was successfully developed, by which the agronomical traits could maintained (Priyadarshan, 2017 ). Rubber trees have been domesticated for approximately one century, and only four breeding generations have been undertaken thus far (Cheng et al ., 2020 ). Despite that, the yield of rubber trees has increased from 496 kg ha −1 in unselected trees to 3000 kg ha −1 in RRIM 3001, a recently released clone (Mazlan et al ., 2021 ; Priyadarshan, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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Genic Conservation and Genetic Improvement of Hevea brasiliensis

Sathik

Gireesh

2021

Cash Crops

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Comparative analysis of latex transcriptomes reveals the potential mechanisms underlying rubber molecular weight variations between the Hevea brasiliensis clones RRIM600 and Reyan7-33–97

Xin

Yue

et al. 2021

BMC Plant Biol

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Background The processabilities and mechanical properties of natural rubber depend greatly on its molecular weight (MW) and molecular weight distribution (MWD). However, the mechanisms underlying the regulation of molecular weight during rubber biosynthesis remain unclear. Results In the present study, we determined the MW and particle size of latex from 1-year-old virgin trees and 30-year-old regularly tapped trees of the Hevea clones Reyan7-33–97 and RRIM600. The results showed that both the MW and the particle size of latex varied between these two clones and increased with tree age. Latex from RRIM600 trees had a smaller average particle size than that from Reyan7-33–97 trees of the same age. In 1-year-old trees, the Reyan7-33–97 latex displayed a slightly higher MW than that of RRIM600, whereas in 30-year-old trees, the RRIM600 latex had a significantly higher MW than the Reyan7-33–97 latex. Comparative analysis of the transcriptome profiles indicated that the average rubber particle size is negatively correlated with the expression levels of rubber particle associated proteins, and that the high-MW traits of latex are closely correlated with the enhanced expression of isopentenyl pyrophosphate (IPP) monomer-generating pathway genes and downstream allylic diphosphate (APP) initiator-consuming non-rubber pathways. By bioinformatics analysis, we further identified a group of transcription factors that potentially regulate the biosynthesis of IPP. Conclusions Altogether, our results revealed the potential regulatory mechanisms involving gene expression variations in IPP-generating pathways and the non-rubber isoprenoid pathways, which affect the ratios and contents of IPP and APP initiators, resulting in significant rubber MW variations among same-aged trees of the Hevea clones Reyan7-33–97 and RRIM600. Our findings provide a better understanding of rubber biosynthesis and lay the foundation for genetic improvement of rubber quality in H. brasiliensis.

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The Reyan 7-33-97 Rubber Tree Genome: Insight into Its Structure, Composition and Application

Cited by 3 publications

References 94 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

Genic Conservation and Genetic Improvement of Hevea brasiliensis

Comparative analysis of latex transcriptomes reveals the potential mechanisms underlying rubber molecular weight variations between the Hevea brasiliensis clones RRIM600 and Reyan7-33–97

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