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Comparative transcriptomic and physiological analyses unravel wheat source root adaptation to phosphorous deficiency.
Daozhen Luo1, Muhammad Usman1, Fei Pang1
1Guangxi Key Laboratory of Agro-Environment and Agric-Products Safety, College of Agriculture, Guangxi University, Nanning, 530004, China.
Scientific Reports
|May 14, 2024
Summary
Wheat genotypes show varied responses to low phosphorus (LP) stress. The P-efficient Fielder genotype exhibited superior growth and root development compared to the P-inefficient Ardito, revealing key genes for improved phosphorus utilization.
Area of Science:
- Plant Physiology
- Molecular Biology
- Agricultural Science
Background:
- Phosphorus (P) is essential for plant growth, but its molecular regulation under low phosphorus (LP) conditions in wheat remains poorly understood.
- Understanding these pathways is critical for improving crop P-use efficiency in agriculture.
Purpose of the Study:
- To elucidate the regulatory pathways and genetic responses of wheat genotypes to low phosphorus (LP) stress.
- To compare the performance of a P-efficient (Fielder) and a P-inefficient (Ardito) wheat genotype under LP conditions.
Main Methods:
- Phenotypic, physiological, and transcriptome analyses were performed on Fielder and Ardito wheat genotypes under normal (NP) and LP stress.
- Root structure was analyzed, and differentially expressed genes (DEGs) in response to LP were identified using transcriptome sequencing.
- KEGG enrichment analysis was used to identify key metabolic pathways affected by LP stress.
Main Results:
- Fielder demonstrated significantly enhanced growth, chlorophyll content, and root biomass under LP stress compared to Ardito.
- Transcriptome analysis revealed substantial LP-induced changes in gene expression, with key genes including acid phosphatases (PAPs), phosphate transporters (PHT1, PHO1), SPX domain proteins, and transcription factors (MYB, bHLH, WRKY).
- Enriched pathways included plant hormone signal transduction, secondary metabolite biosynthesis, and carbohydrate metabolism.
Conclusions:
- The study identifies Fielder as a superior genotype for adapting to low phosphorus conditions, highlighting its enhanced physiological and root development.
- Crucial genes and intricate regulatory networks involved in wheat's response to LP stress were unveiled, providing valuable genetic insights.
- These findings offer a foundation for developing wheat varieties with improved phosphorus utilization efficiency.
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