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Comparative time-course transcriptome analysis in contrasting Carex rigescens genotypes in response to high
Kun Zhang1, Huiting Cui1, Mingna Li2
1College of Grassland Science and Technology, China Agricultural University, Beijing, 100193, PR China.
Ecotoxicology and Environmental Safety
|March 15, 2020
Summary
This study reveals distinct molecular mechanisms of salt tolerance in two Carex rigescens genotypes. The salt-tolerant genotype exhibits unique gene expression related to transcription factors and biosynthesis pathways, crucial for adapting to saline soils.
Area of Science:
- Plant Science
- Environmental Science
- Genomics
Background:
- Soil salinization is a global environmental issue impacting crop production.
- Carex rigescens shows potential for saline soil remediation, but its salt stress response mechanisms are unclear.
Purpose of the Study:
- To elucidate the molecular mechanisms of salt stress tolerance in two contrasting genotypes of Carex rigescens.
- To compare the transcriptomic and physiological responses to salt stress between a tolerant (HH) and sensitive (BJ) genotype.
Main Methods:
- Time-course transcriptome analysis was conducted on 'Huanghua' (HH) and 'Beijing' (BJ) genotypes of Carex rigescens under salt stress.
- Physiological changes were monitored within 24 hours.
- Differential gene expression analysis and pathway enrichment were performed.
Main Results:
- The HH genotype demonstrated higher salt tolerance than the BJ genotype.
- Significant differences in gene expression were observed between genotypes, with BJ showing increased activity in carbohydrate metabolism and stress response genes, and HH exhibiting unique upregulation of transcription factors, hormone signaling, and oxidation-reduction genes.
- Specific genes involved in trehalose and pectin biosynthesis, and chitin catabolism were uniquely upregulated in the HH genotype.
Conclusions:
- Carex rigescens exhibits distinct genotypic variations in salt stress adaptation and resistance.
- Upregulated genes in transcription factor networks, hormone signal transduction, and biosynthesis pathways contribute to salt tolerance in the HH genotype.
- Candidate genes like mannan endo-1,4-beta-mannosidase offer potential targets for enhancing salt resistance in C. rigescens and other plants.
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