An evergrowing sweet cherry for research and breeding.

Area of Science:

• Plant genetics
• Molecular biology
• Horticulture

Background:

• Evergrowing phenotypes, characterized by continuous growth, are rare in deciduous trees, previously identified only in peach, hazelnut, and pomegranate.
• These genotypes are valuable for genetic research into seasonal growth and dormancy regulation.
• DORMANCY ASSOCIATED MADS BOX (DAM) transcription factors have been identified as key regulators in peach.

Purpose of the Study:

• To breed and characterize a new evergrowing (evg) sweet cherry genotype.
• To investigate the genetic basis of the evergrowing phenotype in sweet cherry.
• To explore the utility of this evg genotype as a research and breeding tool.

Main Methods:

• Production of the evg sweet cherry through in vitro embryo rescue of self-fertilization seeds.
• Phenotypic characterization of the evg genotype, including bud set and winter growth.
• Analysis of DORMANCY ASSOCIATED MADS BOX (PavDAMs) gene structure and expression profiles.

Main Results:

• An evergrowing sweet cherry genotype was successfully created, exhibiting continuous growth without autumn bud set.
• Unlike peach, no major structural deletions were found in the PavDAMs genes of the evg sweet cherry.
• Specific expression patterns of PavDAMs genes were observed, suggesting a role in the evergrowing phenotype.

Conclusions:

• The evergrowing sweet cherry phenotype may result from the expression of homozygous recessive alleles in the PavDAMs genes.
• This new genotype provides a valuable model for studying the molecular mechanisms of plant growth and dormancy.
• Further research is ongoing to fully elucidate the genetic underpinnings of this phenotype.