Integrating molecular and physiological approaches to quantify genetic controls for wheat development and improve...

Area of Science:

• Plant Biology
• Molecular Genetics
• Agricultural Science

Background:

• Genotype × environment (G×E) interactions critically influence plant development, particularly flowering time.
• Accurate phenotyping is essential for dissecting G×E effects, linking molecular mechanisms to physiological responses.
• Wheat flowering time is a complex trait influenced by multiple genes and environmental cues.

Purpose of the Study:

• To integrate molecular regulation, developmental physiology, and environmental factors to understand wheat flowering time.
• To develop a robust phenotyping protocol for disentangling G×E controls on flowering time.
• To parameterize and validate the Cereal Anthesis Molecular Phenology (CAMP) model using integrated datasets.

Main Methods:

• Time-resolved phenotyping of apical development and final leaf number (FLN) in six wheat genotypes.
• Concurrent gene-expression profiling of key flowering-time genes (VRN1, VRN2, VRN3) under contrasting temperature and photoperiod regimes.
• Integration of experimental data with the CAMP model to compare observed and simulated gene activity.

Main Results:

• Environmentally driven variation in FLN is explained by shifts in apical transitions and VRN gene-expression dynamics.
• The CAMP model captured overall developmental responses but showed discrepancies in gene-expression patterns between foliar and apical tissues.
• Systematic differences highlight the importance of distinguishing expression sites and temporal scaling in gene activity.

Conclusions:

• Integrated phenotyping and modeling provide a framework for understanding G×E interactions in flowering time.
• Distinguishing foliar expression from apical regulatory activity is crucial for accurate modeling.
• A new phenotyping protocol based on FLN responses offers unconfounded developmental phenotypes linked to genetic regulation.