Red light enhances folate accumulation in wheat seedlings

Area of Science:

• Plant Science
• Agricultural Science
• Biochemistry

Background:

• Folate is an essential nutrient crucial for various biological processes.
• Light is known to influence plant growth and development, but its specific effects on folate accumulation are not fully understood.

Purpose of the Study:

• To investigate the impact of different light spectra on folate accumulation in wheat seedlings.
• To identify the optimal light conditions for enhancing folate content.

Main Methods:

• Wheat seedlings were exposed to red, white, blue, green, and yellow lights at a specific intensity (30 μmol/(m2·s)).
• Total folate content and the dominant folate component, 5-Methyl-tetrahydrofolate (5-CH3-THF), were quantified.
• Gene expression of key folate synthesis enzymes, guanosine triphosphate (GTP) cyclohydrolase 1 (GCH1) and aminodeoxychorismate synthase (ADCS), was analyzed.
• Enzyme activity of GCH1 and ADCS was measured.
• Levels of folate synthesis precursors, pterin and p-aminobenzoic acid (pABA), were determined.

Main Results:

• Red light significantly increased total folate accumulation by 24% compared to darkness.
• 5-Methyl-tetrahydrofolate (5-CH3-THF) was the dominant folate form and was notably enhanced by red light.
• Folate content in leaves was higher and more responsive to light than in endosperm or roots.
• Red light upregulated GCH1 and ADCS gene expression and enhanced their enzyme activity.
• The content of folate synthesis precursors, pterin and pABA, increased under red light.

Conclusions:

• Light, particularly red light, can significantly enhance folate accumulation in wheat seedlings.
• The increase in folate is attributed to elevated precursor levels, enhanced key enzyme activity, and upregulated gene expression.
• These findings suggest a potential strategy for improving folate content in crops through light manipulation.