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Responses to Salt Stress

Responses to Salt Stress

Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.

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Obtaining High-Quality Transcriptome Data from Cereal Seeds by a Modified Method for Gene Expression Profiling

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Transcriptome and DNA Methylome Analysis of Two Contrasting Rice Genotypes under Salt Stress during Germination.

Yongqiang Li¹, Dianjing Guo¹

¹State Key Laboratory of Agrobiotechnology, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong 999077, China.

International Journal of Molecular Sciences

|February 25, 2023

Summary

This summary is machine-generated.

Direct-seeding rice requires salt tolerance for germination. This study reveals genetic and epigenetic differences in salt-tolerant (FL478) versus salt-sensitive (IR29) rice, offering insights for breeding improved varieties.

Keywords:

DNA methylation direct seeding rice salt stress seed germination transcriptome

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Area of Science:

Plant Biology
Genetics
Epigenetics

Background:

Direct-seeding rice cultivation is expanding globally, driven by climate change and labor shortages.
Salinity stress poses a significant challenge to rice seed germination, hindering direct-seeding success.
Understanding salt tolerance mechanisms during germination is crucial for developing resilient rice varieties.

Purpose of the Study:

To investigate the genetic and epigenetic mechanisms underlying salt tolerance in rice during seed germination.
To compare salt responses in a salt-tolerant (FL478) and a salt-sensitive (IR29) rice genotype.

Main Methods:

Comparative analysis of germination rates under salinity stress.
Transcriptomic analysis to identify salt-responsive genes.
Whole genome bisulfite sequencing (BS-seq) to assess DNA methylation patterns.

Main Results:

The salt-tolerant FL478 exhibited higher germination rates than the salt-sensitive IR29 under salt stress.
Salt stress significantly upregulated GD1 (germination defective 1) in IR29, while salt-responsive genes showed varied regulation in IR29 but not FL478.
Global CHH methylation increased under salinity, with hypermethylated regions primarily in transposable elements.
Differentially expressed genes associated with differentially methylated regions in IR29 were linked to stress response and germination pathways.

Conclusions:

Rice genotypes exhibit distinct genetic and epigenetic responses to salt stress during germination.
Epigenetic modifications, particularly changes in CHH methylation, play a role in salt tolerance.
These findings provide a foundation for breeding salt-tolerant rice varieties for direct-seeding cultivation.