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Genomic insight into domestication of rubber tree
Jinquan Chao1,2,3, Shaohua Wu1,2,3, Minjing Shi1,2,3
1National Key Laboratory for Tropical Crop Breeding, Chinese Academy of Tropical Agricultural Sciences, Sanya, 572024, China.
Nature Communications
|August 2, 2023
Summary
Researchers decoded the rubber tree genome, identifying HbPSK5 as a key gene influencing rubber yield. This discovery aids in improving rubber production and domesticating other rubber-producing plants.
Area of Science:
- Plant genetics
- Genomics
- Agricultural science
Background:
- Global demand for natural rubber necessitates improvements in rubber tree (Hevea brasiliensis) production.
- Understanding the genetic underpinnings of rubber tree domestication is vital for enhancing rubber yield.
Purpose of the Study:
- To provide a high-quality genome assembly of Hevea brasiliensis.
- To identify genetic variations and domestication-related signals.
- To pinpoint key genes influencing rubber production traits.
Main Methods:
- High-quality genome assembly of Hevea brasiliensis.
- Resequencing of 335 accessions to map genome variations.
- Identification and analysis of domestication-related genes and traits.
- Heterologous overexpression of HbPSK5 in Taraxacum kok-saghyz.
Main Results:
- A 1.58 Gb genome assembly with an 11.21 Mb contig N50 was generated.
- Domestication signals and a higher number of laticifer rings were identified as a major domestication trait.
- HbPSK5, encoding phytosulfokine (PSK), was identified as a key domestication gene correlated with laticifer ring number.
- HbPSK5 transcriptional activation by MYC members links PSK signaling to jasmonates in laticifer differentiation.
- Overexpression of HbPSK5 increased rubber content in Russian dandelion by promoting laticifer formation.
Conclusions:
- The study provides a valuable genome resource for Hevea brasiliensis.
- HbPSK5 is a crucial domestication gene for rubber production.
- Findings offer insights into improving rubber tree domestication and other rubber-producing plants.
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