Integrated model simulates bigger, sweeter tomatoes under changing climate under reduced nitrogen and water input

Area of Science:

• Agricultural Science
• Plant Physiology
• Computational Biology

Background:

• Understanding plant-fruit system interactions is crucial for simulating crop responses to environmental factors.
• Optimizing cultivation practices requires integrated models that consider both plant physiology and fruit quality.

Purpose of the Study:

• To develop an integrative model (TGFS) simulating tomato plant and fruit growth and sugar metabolism.
• To assess the impact of environmental factors (nitrogen, CO2, temperature) and cultivation practices on tomato yield and quality.

Main Methods:

• Coupled biophysical equations for leaf gas exchange, water transport, carbon allocation, organ growth, and fruit sugar metabolism.
• Incorporated effects of soil nitrogen and atmospheric CO2 on leaf gas exchange.
• Validated the model against experimental data for tomato dry mass and fruit sugar concentrations.

Main Results:

• The TGFS model accurately simulated tomato dry mass (leaf, stem, root, fruit) and fruit sugar/starch concentrations under varying nitrogen and water inputs.
• Increased air temperature and CO2 positively impacted fruit growth but not sugar concentration.
• Model simulations indicated that reducing nitrogen (15-25%) and irrigation (10-20%) could increase fresh weight (27.8-36.4%) and soluble sugar concentration (up to 10%).

Conclusions:

• The TGFS model is a valuable tool for understanding and optimizing tomato production.
• Adjusted nitrogen and water management strategies can enhance tomato yield and quality, particularly in the context of climate change.
• The model supports sustainable agriculture by guiding resource management for high-quality tomato cultivation.