Transcriptome analysis provides insights into light condition effect on paclitaxel biosynthesis in yew saplings

Area of Science:

• Plant physiology
• Molecular biology
• Biochemistry

Background:

• Taxus species are vital sources of the anticancer drug paclitaxel.
• Environmental factors, particularly light, influence Taxus growth and metabolism.
• The specific effects of light on paclitaxel biosynthesis remain largely uncharacterized.

Purpose of the Study:

• To investigate the physiological and molecular responses of Taxus chinensis to varying light conditions.
• To elucidate how light intensity affects paclitaxel biosynthesis and related gene expression.
• To identify key genes and pathways involved in Taxus light stress response.

Main Methods:

• Exposure of Taxus chinensis saplings to three distinct light conditions.
• Assessment of physiological responses, including oxidative stress and photoinhibition.
• Transcriptomic analysis to evaluate gene expression patterns, focusing on paclitaxel biosynthesis and regulatory factors.

Main Results:

• High light induced oxidative stress, photoinhibition, and damage to photosynthetic systems in T. chinensis.
• Paclitaxel content in leaves significantly decreased under elevated light intensity.
• Genes involved in paclitaxel biosynthesis and phenylpropanoid pathways were downregulated, while certain CYP450, MYB, and AP2/ERF genes were upregulated by high light.

Conclusions:

• Light conditions significantly influence Taxus chinensis growth and paclitaxel production.
• Molecular mechanisms underlying light stress response and paclitaxel biosynthesis were elucidated.
• Findings support improved artificial regeneration of Taxus and enhanced paclitaxel yield.