Growth and proteomic analysis of tomato fruit under partial root-zone drying

Area of Science:

• Plant Physiology
• Proteomics
• Agricultural Science

Background:

• Water management significantly impacts crop yield and quality.
• Partial Root-zone Drying (PRD) is a water-saving irrigation technique.
• Understanding PRD's physiological and molecular effects on fruit development is crucial.

Purpose of the Study:

• To investigate the effects of PRD on tomato fruit growth and pericarp proteome.
• To identify key proteins and metabolic pathways affected by PRD in tomato fruits.
• To elucidate the mechanisms behind PRD-induced changes in fruit development.

Main Methods:

• Tomato plants (cultivar Ailsa Craig) were subjected to PRD (70% of fully irrigated water).
• Fruit number, diameter, fresh weight (FW), and dry weight (DW) were measured.
• Proteomic analysis (2D-PAGE, mass spectrometry) was performed on pericarp tissue at 15 and 30 days post-anthesis (dpa).

Main Results:

• PRD reduced fruit number but slightly increased fruit diameter; total FW and DW per plant remained unchanged.
• PRD fruits exhibited a slower growth rate but longer cell expansion duration, resulting in larger size.
• Proteomic analysis revealed slower carbon/amino acid metabolism, increased cell wall, energy, and stress defense proteins in PRD fruits.

Conclusions:

• PRD influences tomato fruit growth by altering proteome, extending cell expansion duration.
• Slower metabolic flux in PRD fruits is compensated by enhanced cell wall, energy, and stress-related proteins.
• Upregulation of antioxidative enzymes in PRD fruits suggests a role in managing mild stress during extended growth.