Artificial Light for Improving Tomato Recovery Following Grafting: Transcriptome and Physiological Analyses

Area of Science:

• Horticulture
• Plant Physiology
• Agricultural Science

Background:

• Grafting is crucial for tomato production, enhancing traits and disease resistance.
• Seedling recovery post-grafting is vital but influenced by environmental factors.
• The impact of light conditions on grafted tomato recovery remains understudied.

Purpose of the Study:

• To investigate the effects of artificial light versus traditional shading on grafted tomato seedling recovery.
• To analyze the physiological and molecular responses of grafted tomatoes to different light treatments.

Main Methods:

• Comparison of artificial light and traditional shading for grafted tomato seedling recovery.
• Assessment of seedling health index, chlorophyll content, dry weight, photosynthesis, and water use efficiency.
• Transcriptome analysis to identify differentially expressed genes (DEGs) and enriched pathways.
• Measurement of endogenous hormone levels (SA, Kin, IAA, JA).

Main Results:

• Artificial light treatment resulted in higher healthy index, chlorophyll content, shoot dry weight, net photosynthetic rate (Pn), and water use efficiency (WUE).
• Transcriptome analysis revealed DEGs enriched in plant hormone signal transduction pathways under artificial light.
• Artificial light led to increased salicylic acid (SA) and kinetin (Kin) levels, and decreased indoleacetic acid (IAA) and jasmonic acid (JA) levels.

Conclusions:

• Artificial light positively influences the morphogenesis and photosynthetic efficiency of grafted tomato seedlings.
• Artificial light improves grafting recovery performance by modulating endogenous hormone levels.
• This study highlights artificial light as a superior method for enhancing grafted tomato seedling recovery.