Climate change enhances stability of wheat-flowering-date

Area of Science:

• Agricultural Science
• Plant Genetics
• Climate Change Impact

Background:

• Winter wheat flowering date stability is vital for consistent crop yields.
• Climate change poses uncertainties for wheat flowering times and crop performance.
• Identifying stable wheat genotypes is crucial for future agricultural planning.

Purpose of the Study:

• To investigate the influence of climate change on winter wheat flowering dates.
• To predict the impact of future climate scenarios on flowering date stability.
• To identify stable wheat genotypes for the Northern China winter wheat region.

Main Methods:

• A multi-locus genotype-based (MLG-based) model was developed to simulate wheat flowering dates.
• The MLG-based model was calibrated and validated using observational data from the Northern China winter wheat region (NCWWR).
• Flowering dates were projected under Representative Concentration Pathways (RCP4.5 and RCP8.5) to assess stability under future climate conditions.

Main Results:

• The MLG-based model accurately simulated flowering dates (RMSE of 2.3 days), explaining 88.5% of genotypic variation.
• Wheat flowering dates are projected to advance by 11-14 days by 2050 under RCP4.5 and RCP8.5 scenarios.
• Flowering date stability is expected to increase under future climate scenarios due to earlier flowering trends.

Conclusions:

• The combined action of Vrn and Ppd genes is critical for wheat flowering date stability.
• The Ppd-D1a allele combined with winter genotypes carrying the vrn-D1 allele significantly enhances flowering date stability.
• These findings offer valuable guidance for wheat breeding and production strategies under evolving climatic conditions.