AsianScientist (Dec. 5, 2013) – Researchers in China have unraveled the whole genome sequence of desert poplar, Populus euphratica, and the genetic bases underlying its adaptation to salt stress.
The study, published in Nature Communications and led by researchers at BGI-Shenzhen, provides new insights for understanding the genetic basis of tree adaptation to salt stress and facilitating the genetic breeding of cultivated poplars for saline fields.
Trees are the lungs of the earth as they can fix carbon dioxide – the major greenhouse gas. Forest trees rarely grow in saline soils, but the desert poplar is well-adapted to extreme desert environments and an important species for studying the effects of salt stresses on trees.
Notably, the desert poplar maintains higher growth and photosynthetic rates than other poplar species at high salinity, and can survive salt concentrations in nutrient solution of up to 450 mM. However, knowledge of the genomic mechanisms of desert poplar under salt stress remains very limited.
Considering the limitation of next-generation sequencing for assembling complex genomes with high heterozygosity, researchers used a newly developed fosmid-pooling strategy to sequence and assemble the genome of the desert poplar.
As the genome of desert poplar is very similar to that of the closely related mesophytic congener, P. trichocarpa, researchers investigated the differences between the two genomes and suggested that P. euphratica diverged from P. trichocarpa within the last 8 to 14 million years.
Although both species shared at least two whole-genome duplication (WGDs) and exhibited extensive collinearity across the gene space, species-specific genes involved in stress tolerance, such as ion transport, ATPase activity, transcript factor activity and oxidoreductase activity, were selectively expanded and/or positively selected in the P. euphratica genome.
When studying the adaptation mechanisms to against salt stress, researchers found that several gene families likely to be involved in tolerance to salt stress contain significantly more gene copies in the P. euphratica lineage. They also compared the P. euphratica in response to salt stress with salt-sensitive poplar (P. tomentosa), and found some genes involved in ion transport and homeostasis, such as NhaD1, KUP3 and NCL, were distinctly upregulated under salt stress.
“The complete genome sequencing of desert poplar revealed the underlying genetic mechanisms of poplar to against salt stress, laying a solid foundation for accelerating the genetic breeding of cultivated poplars for saline and desert fields.” said Junyi Wang, Project Manager at BGI.
“Our work also demonstrates that trans-omic approach to study salt-tolerant plants is applicable on both herbaceous and woody plants, providing new insights into the comprehensive understanding of plants’ salt tolerance and drought resistance.”
The article can be found at: Ma T et al. (2013) Genomic insights into salt adaptation in a desert poplar.
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Source: BGI; Photo: lorenkerns/Flickr/CC.
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