3dCAP-Wheat: An Open-Source Comprehensive Computational Framework Precisely Quantifies Wheat Foliar, Nonfoliar, and...

Area of Science:

• Plant Physiology
• Agricultural Science
• Photosynthesis Research

Background:

• Canopy photosynthesis integrates contributions from all above-ground tissues, but the role of nonfoliar organs remains unclear.
• Existing models often lack comprehensive inclusion of all photosynthetic tissues, limiting quantitative analysis.

Purpose of the Study:

• To develop and validate a complete canopy photosynthesis model for wheat, incorporating all above-ground photosynthetic tissues.
• To quantify the contributions of foliar and nonfoliar tissues to wheat canopy photosynthesis.
• To investigate the impact of physiological and architectural traits on canopy photosynthesis.

Main Methods:

• Development of a novel, comprehensive canopy photosynthesis model.
• Validation using state-of-the-art gas exchange measurement facilities on wheat.
• Systematic analysis of tissue contributions and trait responses using the model.

Main Results:

• Nonfoliar tissues contribute substantially to gross canopy photosynthesis, increasing from ~4% at tillering to ~50% at the milking stage.
• Nonfoliar tissues absorb a significant portion of light, rising from ~6% to ~60% across growth stages.
• Enhanced spike photosynthetic activity, erect leaves, and optimized plant architecture improve canopy net photosynthesis.

Conclusions:

• The developed model accurately predicts wheat canopy gas exchange under various conditions.
• Nonfoliar tissues play a crucial, stage-dependent role in wheat canopy photosynthesis.
• The study provides a platform for designing more photosynthetically efficient wheat crops.