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Comparative Transcriptome and Hormonal Analysis Reveals the Mechanisms of Salt Tolerance in Rice

文献类型： 外文期刊

作者： Jin, Dingsha 1 ; Xu, Yanchao 3 ; Iqbal, Asif 4 ; Liu, Yuqing 1 ; Zhang, Yage 1 ; Lin, Youzhen 1 ; Tang, Liqiong 2 ; Wang, Xinhua 2 ; Wang, Junjie 1 ; Huang, Mengshu 1 ; Xu, Peng 5 ; Wang, Xiaoning 1 ;

作者机构： 1.Hainan Acad Agr Sci, Sanya Inst, Sanya 572000, Peoples R China

2.Hainan Acad Agr Sci, Inst Food Crops, Haikou 571100, Peoples R China

3.Chinese Acad Agr Sci, Natl Nanfan Res Inst Sanya, Sanya 572024, Peoples R China

4.Hazara Univ, Dept Agr, Mansehra 21120, Khyber Pakhtunk, Pakistan

5.Chinese Acad Sci, CAS Key Lab Trop Plant Resources & Sustainable Use, Xishuangbanna Trop Bot Garden, Menglun 666303, Mengla, Peoples R China

关键词： rice; seed germination; salt stress; transcriptome analysis; hormonal regulation; salt-tolerance mechanisms

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：4.9； 五年影响因子：5.7 ）

ISSN： 1661-6596

年卷期： 2025 年 26 卷 14 期

页码：

收录情况： SCI

摘要： Salt stress is a major constraint to seed germination and early seedling growth in rice, affecting crop establishment and productivity. To understand the mechanisms underlying salt tolerance, we investigated two rice varieties with contrasting responses as follows: salt-tolerant sea rice 86 (SR86) and salt-sensitive P559. Germination assays under increasing NaCl concentrations (50-300 mM) revealed that 100 mM NaCl induced clear phenotypic divergence. SR86 maintained bud growth and showed enhanced root elongation under moderate salinity, while P559 exhibited significant growth inhibition. Transcriptomic profiling of buds and roots under 100 mM NaCl identified over 3724 differentially expressed genes (DEGs), with SR86 showing greater transcriptional plasticity, particularly in roots. Gene ontology enrichment revealed tissue- and genotype-specific responses. Buds showed enrichment in photosynthesis-related and redox-regulating pathways, while roots emphasized ion transport, hormonal signaling, and oxidative stress regulation. SR86 specifically activated genes related to photosystem function, DNA repair, and transmembrane ion transport, while P559 showed activation of oxidative stress-related and abscisic acid (ABA)-regulated pathways. Hormonal profiling supported transcriptomic findings as follows: both varieties showed increased gibberellin 3 (GA3) and gibberellin 4 (GA4) levels under salt stress. SR86 showed elevated auxin (IAA) and reduced jasmonic acid (JA), whereas P559 maintained stable IAA and JA levels. Ethylene precursor and salicylic acid levels declined in both varieties. ABA levels rose slightly but not significantly. These findings suggest that SR86's superior salt tolerance results from rapid growth, robust transcriptional reprogramming, and coordinated hormonal responses. This study offers key insights into early-stage salt stress adaptation and identifies molecular targets for improving stress resilience in rice.

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