Nucleotide polymorphism affecting FLC expression underpins heading date variation in horticultural brassicas

Area of Science:

• Plant genetics
• Molecular biology
• Agricultural science

Background:

• Flowering time variation in Brassica vegetables enables year-round harvesting.
• Understanding the molecular basis of flowering time is crucial for crop improvement.

Purpose of the Study:

• To investigate the molecular basis of heading date variation in Brassica oleracea.
• To identify the genetic factors controlling vernalization response and flowering time.

Main Methods:

• Characterization of BoFLC.C2 alleles in Brassica oleracea.
• Complementation experiments in Arabidopsis thaliana.
• Analysis of epigenetic silencing in response to cold.

Main Results:

• Allelic variation at BoFLC.C2 is a major determinant of heading date variation.
• Distinct BoFLC.C2 alleles exhibit different cold-induced epigenetic silencing and expression dynamics.
• Cis-polymorphism at BoFLC.C2 quantitatively influences vernalization response and heading date.

Conclusions:

• Breeding for heading date variation in brassicas involves selection of cis-polymorphism at FLC genes.
• Understanding BoFLC.C2 allelic variation allows for selection of climate-resilient varieties.
• This knowledge facilitates breeding for robust heading dates under changing climatic conditions.