Comparative transcriptome analysis of Isatis indigotica under different precipitation conditions

Area of Science:

• Plant Science
• Molecular Biology
• Agricultural Science

Background:

• Plant adaptation to environmental stress is key for crop resilience.
• Isatis indigotica growth and yield are sensitive to water availability.
• High-throughput transcriptome sequencing was employed to study Isatis indigotica responses to water variations.

Purpose of the Study:

• To investigate the molecular mechanisms underlying Isatis indigotica adaptation to varying water conditions.
• To identify key genes and pathways involved in Isatis indigotica's response to drought and enhanced precipitation.
• To provide insights for optimizing cultivation practices and improving medicinal yield.

Main Methods:

• Isatis indigotica leaves were subjected to different water treatments: normal (CK), reduced rainfall (R1, R2), and enhanced rainfall (I1, I2).
• Physiological indicators like malondialdehyde (MDA), proline (pro), and catalase (CAT) activity were measured.
• High-throughput transcriptome sequencing was performed, followed by Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analyses.

Main Results:

• Enhanced rainfall (80%) led to the lowest MDA content and highest proline and catalase activity.
• Transcriptome analysis revealed significant numbers of differentially expressed genes (DEGs) under varying water conditions, with more DEGs under increased rainfall.
• GO and KEGG analyses highlighted enrichment in cellular processes, metabolic pathways (glutathione metabolism, phenylpropanoid biosynthesis), and plant hormone signaling.

Conclusions:

• Water availability significantly impacts Isatis indigotica physiology and gene expression.
• Appropriate irrigation can enhance the accumulation and quality of medicinal compounds in Isatis indigotica.
• This study offers molecular-level understanding for optimizing field management and improving medicinal material yield.